Key to the Nearctic and Neotropical species of Synaldis

1. Propodeum smooth, without or with short transverse carinae ending far from sides (Figs 7A, 11C) …2

– Propodeum sculptured, always with transverse carinae reaching its lateral sides (Figs 3C, 5C, 9B) …9

2. Prescutellar pit absent [Antenna 20-segmented. Body length 1.7 mm. USA] …………………… …………………………………………………………………………… S. cabinica Fischer, 1967

– Prescutellar pit present ……………………………………………………………………………3

3. Eye in lateral view 0.8–1.0 times as long as temple medially ……………………………………4

– Eye in lateral view 1.3–1.5 times as long as temple medially ………………………………………6

4. First flagellar segment 1.6 times, second segment 1.4 times, and sixth segment 1.4 times as long as their maximum width. Mandible 1.3 times as long as its maximum width (Fig. 12A) [Antenna 18-segmented. Body length 1.7 mm. USA] ……………………… S. acutidens Fischer, 1967

– First flagellar segment 2.6–3.3 times, second segment 2.1–2.4 times, and sixth segment 1.9 times as long as their maximum width. Mandible as long as its maximum width (Fig. 12B) ………5

5. First flagellar segment 2.6 times as long as its maximum width. Marginal cell 4.2 times as long as its maximum width. Vein SR 1 2.9 times as long as 3-SR. Head in dorsal view 1.5 times as long as its median length. Clypeus 2.2 times as long as its maximum width. [Antenna 19-segmented. Body length 1.4 mm. USA] ……………………………… S. pygmaea Viereck, 1917

– First flagellar segment 3.3 times as long as its maximum width. Marginal cell 4.7 times as long as its maximum width. Vein SR 1 3.8 times as long as 3-SR. Head in dorsal view 1.8 times as long as its median length. Clypeus 2.7 times as long as its maximum width. [Antenna 16-segmented (apical segments broken). Body length 1.6 mm. USA] ………… S. blantoni Fischer, 1967

6. Hindfemur4.0timesaslongasitsmaximumwidth.Firstmetasomaltergite1.6timesaslongasitsapical width.Face 2.2–2.4 times as wide as high (Fig.12C). Vein SR 1 3.6times as long as vein3-SR. [Antenna 12-segmented (apical segments broken). Body length 1.9 mm. USA] … S. rotundidens Fischer, 1967

– Hind femur 4.4–4.6 times as long as its maximum width. First metasomal tergite 2.0–2.2 times as long as its apical width. Face 1.6–1.8 times as wide as high (Fig. 12D). Vein SR1 1.8–3.0 times as long as vein 3-SR ………………………………………………………………………7

7. Mandible 1.3 times as long as its maximum width. First flagellar segment 3.0 times and sixth segment 1.5 times as long as their maximum width. Marginal cell 3.5 times as long as its maximum width. Vein SR 1 1.8 times as long as vein 3-SR [Antenna 24-segmented. Body length 2.4 mm. USA] …… ………………………………………………………………………… S. segmentata Fischer, 1967

– Mandible 1.6–1.8 times as long as its maximum width (Figs 6C, 10C). First flagellar segment 3.5–4.0 times and sixth segment 1.8–2.9 times as long as their maximum width (Figs 6B, 10D). Marginal cell 4.0 times as long as its maximum width (Figs 7D, 11F). Vein SR1 2.6–3.0 times as long as vein 3-SR (Figs 7D, 11F) ………………………………………………………………………………………8

8. First flagellar segment 3.5 times, second segment 2.3 times and middle segments 1.8–2.0 times as long as their maximum width. First flagellar segment 1.3 times as long as second segment. Scape 1.8 times as long as pedicel (Fig. 10B). Vein SR 1 2.6 times as long as vein 3-SR (Fig. 11F) [Antenna 19–26-segmented. Body length 1.8–2.0 mm. Brazil] …… S. novateutoniae Peris-Felipo, sp. nov.

– First flagellar segment 4.0 times, second segment 3.2–3.3 times and middle segments 2.5–2.9 times as long as their maximum width. First flagellar segment about as long as second segment. Scape 1.5 times as long as pedicel (Fig. 6E). Vein SR 1 3.0 times as long as vein 3-SR (Fig. 7D) [Antenna 18–21-segmented.Bodylength 1.5–1.7mm. Brazil]………… S. longiflagellaris Peris-Felipo, sp.nov.

9. Propodeum with pentagonal areola well defined (Figs 3C, 12E) ………………………………10

– Propodeum without pentagonal areola (Figs 5C, 13A) …………………………………………11

10. Prescutellar pit absent. Mandible 1.5 times as long as its maximum width. First metasomal tergite 2.1 times as long as its apical width [Antenna 25-segmented. Body length 2.6 mm. USA] ………….………………………………………………………………………… S. glabrifovea Fischer, 1967

– Prescutellar pit present (Fig. 3B). Mandible 1.8 times as long as its maximum width (Fig. 2C). First metasomal tergite 2.4 times as long as its apical width (Fig. 2D) [Antenna 20–21-segmented. Body length 1.5–1.7 mm. Brazil] ……… S. brasiliense Peris-Felipo, sp. nov.

11. Prescutellar pit absent [Antenna 15-segmented] …………………………………………………12

– Prescutellar pit present ……………………………………………………………………………14

12. First flagellar segment 2.6 times as long as its maximum width. Apical flagellar segment 2.1 times as long as its maximum width. Face 1.6 times as wide as high. Clypeus 3.2 times as long as high. Mandible 1.4 times as long as its maximum width. [Antenna 15-segmented. Body length 1.6 mm. USA] …………………………………………… S. ulmicola Ashmead, 1889 stat rev.

– First flagellar segment 1.8–2.2 times as long as its maximum width.Apical flagellar segment 1.8 times as long as its maximum width. Face 1.9–2.0 times as wide as high. Clypeus 2.8 times as long as high. Mandible 1.0–1.2 times as long as its maximum width …………………………………………13

13. Eye in lateral view 1.3 times as long as its temple medially. First flagellar segment 1.8 times as long as its maximum width. Scape of antenna 2.3 times as long as pedicel. Prescutellar depression as long as its maximum width (Fig. 13B). Marginal cell 4.1 times as long as its maximum width [Antenna 15-segmented. Body length 1.7 mm. USA] …………………… S. exitiosae Fischer, 1967

– Eye in lateral view 1.6 times as long as its temple medially. First flagellar segment 2.2 times as long as its maximum width. Scape of antenna 1.8 times as long as pedicel. Prescutellar depression 1.5 times as long as its maximum width (Fig. 13C). Marginal cell 4.5 times as long as its maximum width [Antenna 15-segmented. Body length 1.8 mm. USA] ……………… S. painteri Fischer, 1967

14. Eye in lateral view 0.7–0.8 times as long as temple medially (Fig. 13D) …………………………15

– Eye in lateral view 1.0–1.7 times as long as temple medially (Fig. 4B) …………………………17

15. Precoxal sulcus reaching anterior margin of mesopleuron. Hind femur 3.5 times as long as its maximum width [Antenna broken. Body length 1.7 mm. USA] … S. quinnipiacorum Viereck, 1917

– Precoxal sulcus not reaching anterior margin of mesopleuron. Hind femur 4.0 times as long as its maximum width …………………………………………………………………………………16

16. First metasomal tergite 1.3 times as long as its apical width. Second flagellar segment 1.6 times and sixth segment 1.1 times as long as their maximum width. Mandible as long as its maximum width. Prescutellar pit elongate (Fig. 13E). [Antenna 17-segmented. Body length 2.1 mm. USA] ……… ………………………………………………………………………………… S. incisa Gahan, 1912

– First metasomal tergite 2.0 times as long as its apical width. Second flagellar segment 2.0 times and sixth segment 1.7 times as long as their maximum width. Mandible 1.2 times as long as its maximum width.Prescutellar pit oval(Fig. 13F). [Antenna 19-segmented.Body length 1.6 mm. Canada, USA]… ……………………………………………………………………………… S. alfalfae Fischer, 1967

17. Precoxal sulcus reaching anterior margin of mesopleuron ………………………………………18

– Precoxal sulcus not reaching anterior margin of mesopleuron ……………………………………19

18. Propodeal spiracles large, length of spiracle 1.3 times as long as the distance between spiracle and anterior border of propodeum (Fig. 14A). Mandible 1.4 times as long as its maximum width. Subdiscal cell 4.0 times as long as its maximum width. [Antenna 18-segmented. Body length 2.5 mm. USA] ………………………………………………………… S. spiraculosa Fischer, 1967

– Propodeal spiracles relatively small, length of spiracle 3.0 times as long as the distance between spiracle and anterior border of propodeum (Fig. 14B). Mandible 1.2 times as long as its maximum width. Subdiscal cell 2.7 times as long as its maximum width. [Antenna 19-segmented (apical segments broken. Body length 2.1 mm. USA] …… S. sensillosa Fischer, 1967

19. First metasomal tergite 1.4–1.9 times as long as its apical width (Figs 14C, 14D) ……………20

– First metasomal tergite 2.7 times as long as its apical width (Figs 5D, 9C) …………………24

20. First metasomal tergite 1.4 times as long as its apical width. Hind femur 3.3 times as long as its maximum width. Hind tibia 7.0 times as long as its maximum width. [Antenna 15-segmented. Body length 1.6 mm. USA] ………………………… S. megaseliae Fischer, 1967

– First metasomal tergite 1.7–1.9 times as long as its apical width. Hind femur 3.6–4.0 times as long as its maximum width. Hind tibia 7.6–8.3 times as long as its maximum width. …………………21

21. First flagellar segment 3.7 times, second segment 2.4 times and sixth segment 2.3 times as long as their maximum width. Eye in lateral view 1.5 times as long as temple medially. Clypeus 2.3 times as wide as high (Fig. 14E). First metasomal tergite paler than second and third tergites. [Antenna 21-segmented. Body length 1.3 mm. USA] ……………………………… S. liliputana Fischer, 1967

– First flagellar segment 2.1–2.5 times, second segment 1.3–1.7 times and sixth segment 1.3–1.6 times as long as their maximum width. Eye in lateral view 1.0–1.3 times as long as temple medially. Clypeus 2.6–2.9 times as wide as high (Fig. 14F). First metasomal tergite similar colour as second and third tergites ………………………………………………………………………………………22

22. Propodeal spiracles large, length of spiracle 1.5 times as long as the distance between spiracle and anterior border of propodeum (Fig. 15A). Subdiscal cell 3.7 times as long as its maximum width. [Antenna23-segmented(apicalsegmentsbroken).Bodylength 2.3mm.USA]… S.altera Fischer,1967

– Propodeal spiracles relatively small, length of spiracle 3.0–3.6 times as long as the distance between spiracle and anterior border of propodeum (Fig. 15B). Subdiscal cell 2.4–3.0 times as long as its maximum width. [Antennae 17-segmented] ……………………………………………23

23. Face 2.0 times as wide as high. First flagellar segment 2.1 times as long as its maximum width. Mesoscutal pit round (Fig. 15C). Subdiscal cell 3.8 times as long as its maximum width. [Body length 1.8 mm. USA] ……………………………………………………… S. difficilis Fischer, 1967

– Face 1.5 times as wide as high. First flagellar segment 2.5 times as long as its maximum width. Mesoscutal pit elongate (Fig. 15D). Subdiscal cell 5.0 times as long as its maximum width. [Body length 2.1 mm. USA] …………………………………………… S. numerosa Fischer, 1967

24. Face 1.8 times as wide as high (Fig. 4E). Second flagellar segment 2.2 times and sixth segment 1.8 times as long as their maximum width (Fig. 4D). Hind femur 3.5 times as long as its maximum width (Fig. 5E). [Antenna 23–25-segmented. Body length 2.4–2.7 mm. Brazil] ………………… ……………………………………………………………………… S. fritzi Peris-Felipo, sp. nov.

– Face 1.2 times as wide as high (Fig. 8E). Second flagellar segment 2.7 times and sixth segment 2.5 times as long as their maximum width (Fig. 8D). Hind femur 3.9 times as long as its maximum width (Fig.9D).[Antenna20-segmented.Bodylength 1.7mm.Brazil]… S.magnioculis Peris-Felipo, sp.nov.