Colletes, Latreille, 1802

Ayala, Ricardo, 2017, New dark species of the bee genus Colletes (Hymenoptera, Colletidae) from Mexico and Guatemala, Zootaxa 4320 (3), pp. 401-425 : 422-423

Key to the dark species of the genus Colletes of México

1 Females, with ten flagellomeres; six visible terga............................................................ 2

- Males, with 11 flagellomeres; seven visible terga............................................................ 13

2(1) All terga with no apical bands; if present, the pubescence is golden.............................................. 3

- Apical bands present but never with golden pubescence....................................................... 7

3(2) Distal margin of clypeus straight; integument of posterior surface of propodeum shiny with wide superficial striae and shallow median punctures (propodeum reddish brown in some females from Central America)........... C. rugicollis Friese, 1900

- Distal margin of clypeus notched; posterior surface of propodeum coarse (may be shiny), punctures variable............. 4

4(3) Integument of propodeum shiny with small striae giving it a reticulate appearance; anterior area of propodeal triangle with lon- gitudinal striae reaching median part; T1 with small, sparse, and shallow punctures............. C. isthmicus Swenk, 1930

- Integument of propodeum with irregular and broad striae with no reticulate appearance; propodeal triangle with longitudinal striae not reaching median part; T1 with dense and variably sized punctures....................................... 5

5(4) Clypeus with thin and dense striae ( Fig. 24 ); F1 longer than F2 or F3 ( Fig. 23 ); supraclypeal area with longitudinal thin striae and a few sparse and deep punctures....................................................... C. chiapensis sp. n.

- Clypeus with thick striae; F1 and F3 sub equal; supraclypeal with thin striae and without punctures..................... 6

6(5) Propodeum shiny with irregular striae and without apparent punctures; facial fovea slightly broad in proximal margin of eye................................................................................... C. guatemalensis sp. n.

- Propodeum matte with uniform and shallow punctures between striate; facial fovea distinctly broad in the proximal margin of eye......................................................................... C. panamensis Michener, 1954

7(2) Tegula amberish ( Fig. 3 ); sides of acarinarium on T1 with thin and dense striate....................... C. tzotzilis sp. n.

- Tegula dark brown, never amberish; sides of acarinarium on T1 smooth or punctate never striated...................... 8

8(7) Labrum with lateral depressions and median elevation, notched on proximal margin ( Fig. 45 ); clypeus with striae never reach- ing proximal or distal margins............................................................... C. isabelae sp. n.

- Labrum without lateral depressions and/or notched elevation on basal margin; clypeus with striae reaching proximal and distal margins............................................................................................. 9

9(8) Labrum whithout sulcus dividing median elevation or longitudinal striae (as in Fig. 45 ) on both sides; anterior margin of scutum without elevations.............................................................................. 10

- Labrum whith median elevation divided by longitudinal sulcus or with longitudinal striae on both sides; scutum with two flat projections near anterior margin (only for C. solari )......................................................... 11

10(9) Terga reddish brown ( Fig. 32 ); malar area four times wider than long; face with small punctures that become denser towards lower paraocular area.................................................................. C. jaliscoensis sp. n.

- Terga black; malar area two and a half times wider than longer; face with uniform puncture density throughout........................................................................................... C. bombiformis Metz, 1910

11(9) Clypeus and malar area longer than wide; discal area of clypeus slightly protuberant in lateral view without central depression ( Fig. 53 ); T2–T5 with slight gold iridescence; apical bands of terga thin and yellowish ( Fig. 50 )............ C. solari sp. n.

- Clypeus and malar area wider than long; clypeus noticeably protuberant in lateral view with or without central depression; T2– 5 without gold iridescence; terga shiny black without apical bands.............................................. 12

12(11) Terga with small, dense, and shallow punctures with the exception of the marginal zone ( Fig. 39 )....... C. nigerrima sp. n.

- Terga with sparse punctures including the marginal zone ( Fig. 10 ).................................... C. jobeli sp. n.

13(1) Mesosoma with deep and contiguous punctures; terga with apical bands of whitish hairs............................ 14

- Mesosoma with shallow punctures, dense but no contiguous; all terga without apical bands (except for C. solari )......... 15

14(13) Supraclypeal area with shallow punctures and striae with eroded appearance ( Fig. 17 )............. C. guatemalensis sp. n.

- Supraclypeal area with deep punctures and smooth, well defined striae....................... C. rugicollis Friese, 1900

15(14) Tegula and wing amberish, wing veins light brown ( Figs. 1, 2, 3 )................................... C. tzotzilis sp. n.

- Tegula light or dark brown; wing hyaline or with smoky coloration............................................. 16

16(15) Terga with black integument and blue iridescence, mainly on discal area......................................... 17

- Terga with black integument without iridescence, or terga reddish brown with blue iridescence....................... 18

17(16) Facial fovea thin along entire paraocular area; propodeum with broad posterior surface......... C. bombiformis Metz, 1910

- Facial fovea broadened towards upper paraocular area; propodeum triangle with thin posterior surface..... C. isabelae sp. n.

18(16) Eyes strongly emarginate; malar area and clypeus longer than wide ( Fig. 53 ); terga with apical bands yellowish and thin.............................................................................................. C. solari sp. n.

- Eyes slightly emarginate; malar area and clypeus wider than long; apical bands of terga if present never yellowish........ 19

19(18) Terga with marginal zone reddish brown, occasionally amberish; T1–T3 with variably sized punctures on posterior margins..................................................................................................... 20

- Terga with marginal zone black; T1–T3 without punctures on posterior margins ( Fig. 39 ).............. C. nigerrima sp. n.

20(19) Terga with reddish brown integument and blue iridescence; tegula with reddish brown integument, uniformly punctate; scutum with shallow punctures separated by more than a puncture diameter.............................. C. jaliscoensis sp. n.

- Terga with black integument; tegula with dark brown integument and denser punctures on anterior margin ( Fig. 11 ); scutum with dense and deep punctures separated by less than half their diameter............................... C. jobeli sp. n.

Figures

FIGURES 22 – 28. Colletes chiaPensis Balboa & Ayala sp. n. 22 — female holotype: habitus, lateral view; 23 — female holotype: antennae; 24 — female paratype: head; 25 — female paratype: propodeum; 26 — female paratype: paraocular area and vertex; 27 — female holotype: dorsal view of metasoma; 28 — female holotype: S 6.

FIGURES 1 – 7. Colletes tzotzilis Balboa & Ayala sp. n. 1 — female holotype: habitus, lateral view; 2 — male allotype: habitus, lateral view; 3 — female paratype: dorsolateral view of mesosoma; 4 — female holotype: dorsal view of mesosoma; 5 — male allotype: S 7; 6 — male allotype: S 8; 7 — male allotype: genital capsule.

FIGURES 43 – 49. Colletes isabelae Balboa & Ayala sp. n. 36 — female holotype: habitus, lateral view; 44 — male allotype: habitus, lateral view; 45 — female holotype: detail of clypeus, labrum and mandibles; 46 — female holotype: propodeum; 47 — male allotype: S 7; 48 — male allotype: S 8; 49 — male allotype): genital capsule.

FIGURES 29 – 35. Colletes jaliscoensis Balboa & Ayala sp. n. 29 — female holotype: habitus, lateral view; 30 — male allotype: habitus, lateral view; 31 — female paratype: head; 32 — female holotype: dorsal view of metasoma; 33 — male allotype: S 7; 34 — male allotype: S 8; 35 — male allotype: genital capsule.

FIGURES 50 – 56. Colletes solari Balboa & Ayala sp. n. 50 — female holotype: habitus, lateral view; 51 — male allotype: habitus, lateral view; 52 — male paratype: detail of anterior margin of scutum; 53 — male paratype: head; 54 — male allotype: S 7; 55 — male allotype: S 8; 56 — male allotype: genital capsule.

FIGURES 36 – 42. Colletes nigerrima Balboa & Ayala sp. n. 36 — female holotype: habitus, lateral view; 37 — male allotype: habitus, lateral view; 38 — female paratype: prothoracic spine; 39 — female holotype: T 1 and T 2; 40 — male allotype: S 7; 41 — male allotype: S 8; 42 — male allotype: genital capsule.

FIGURES 8 – 14. Colletes jobeli Balboa & Ayala sp. n. 8 — female (holotype): habitus, lateral view; 9 — male allotype: habitus, lateral view; 10 — female holotype: T 2 y T 3; 11 — female paratype: tegula; 12 — male allotype: S 7; 13 — male allotype: S 8; 14 — male allotype: genital capsule.

FIGURES 15 – 21. Colletes guatemalensis Balboa & Ayala sp. n. 15 — female holotype: habitus, lateral view; 16 — male allotype: habitus, lateral view; 17 — Female paratype: Clypeus; 18 — female holotype: dorsal view of metasoma; 19 — male allotype: S 7; 20 — male allotype: S 8; 21 — male allotype: genital capsule.