Socalchemmis, PLATNICK & UBICK, 2001

PLATNICK, NORMAN I. & UBICK, DARRELL, 2001, A Revision of the North American Spiders of the New Genus Socalchemmis (Araneae, Tengellidae), American Museum Novitates 3339, pp. 1-26 : 3-4

Key to Species of Socalchemmis

1. Males (those of S. cruz unknown)...... 2

— Females (those of S. rothi and S. williamsi unknown)....................... 16

2. Median apophysis relatively long, narrow (as in figs. 2, 7; the dolichopus group).... 3

— Median apophysis relatively short, wide, with median flange below tip (as in figs. 33, 38; the icenoglei group)................ 8

3. Embolar base with proximally directed, hookshaped protrusion (figs. 21–23)................................... shantzi

— Embolar base without proximal protrusion.. ................................. 4

4. Dorsal prong of retrolateral tibial apophysis, as viewed ventrally, angular on both distal and proximal sides (fig. 13)..... bixleri

— Dorsal prong of retrolateral tibial apophysis, as viewed ventrally, not angular on both sides............................ 5

5. Median apophysis with sharply pointed, subdistal projection (figs. 26–28).. monterey

— Median apophysis without sharply pointed projection........................ 6

6. Embolus, as viewed retrolaterally, with translucent expansion of base situated just proximal of embolar projection (fig. 18)................................. kastoni

— Embolus, as viewed retrolaterally, without translucent expansion of base........ 7

7. Embolus with sharp projection (figs. 1–3)........................... dolichopus

— Embolus with oblique excavation (figs. 6–8)........................... gertschi

8. Ventral prong of retrolateral tibial apophysis greatly expanded, triangular distally (as in figs. 38, 43)...................... 9

— Ventral prong of retrolateral tibial apophysis not much wider distally than proximally (figs. 33, 63, 68, 71).............. 13

9. Embolus, as viewed prolaterally, with triangular basal protrusion (figs. 36, 51)..... ................................ 10

— Embolus, as viewed prolaterally, without basal protrusion..................... 11

10. Basal protrusion of embolus relatively short, incised (fig. 36).............. cajalco

— Basal protrusion of embolus relatively long, not incised (fig. 51).......... miramar

11. Embolar base, as viewed retrolaterally, relatively wide, much wider than embolar tip (fig. 48)................... idyllwild

— Embolar base, as viewed retrolaterally, not much wider than embolar tip (figs. 43, 58) ............................... 12

12. Embolus with sharply pointed projection, tip relatively large, wide (figs. 41–43)............................... palomar

— Embolus with narrow incision, tip relatively small, narrow (figs. 56–58)..................................... prenticei

13. Embolus wider at tip than subdistally (fig. 32).......................... icenoglei

— Embolus narrower at tip than subdistally... ................................ 14

14. Embolar base with large, rectangular protrusion (figs. 61, 63).............. rothi

— Embolar base without large, rectangular protrusion......................... 15

15. Embolar base smoothly narrowed toward embolar tip (fig. 68)............ williamsi

— Embolar base much wider than tip, abruptly narrowed at level of embolar protrusion (fig. 71)................... catavina

16. Epigynal septum much wider anteriorly than posteriorly (figs. 34, 44, 64, 72)...... ................................ 17

— Epigynal septum not greatly widened anteriorly............................ 20

17. Epigynal septum gradually narrowed posteriorly (figs. 34, 64)............... 18

— Epigynal septum abruptly narrowed posteriorly (figs. 44, 72)................ 19

18. Spermathecal lobes bulbous, directed anteriorly (fig. 65).................. cruz

— Spermathecal lobes angular, directed medially (fig. 35)................... icenoglei

19. Epigynal septum three times as wide anteriorly as posteriorly (fig. 44).... palomar

— Epigynal septum twice as wide anteriorly as posteriorly (fig. 72).......... catavina

20. Epigynal septum wider at middle of its length than anteriorly or posteriorly (figs. 4, 24, 29, 54)......................... 21

— Epigynal septum subequal in width throughout............................ 24

21. Epigynal septum elevated, flanked at sides by less elevated margins (fig. 24)................................... shantzi

— Epigynal septum not flanked at sides.... ................................ 22

22. Medial portion of epigynal septum ill­defined, grading into atrial sides (fig. 29)............................. monterey

— Medial portion of epigynal septum well­defined........................... 23

23. Epigynal septum greatly expanded at middle of length (fig. 54)........... miramar

— Epigynal septum only slightly expanded at middle of length (fig. 4)...................................... dolichopus

24. Epigynal septum relatively short, not extending to near posterior margin of epigynum (figs. 9, 19)..................... 25

Map 1. Southwestern North America showing the distribution of the Socalchemmis dolichopus group with records of S. monterey (N), S. shantzi (N), S. cruz (C), and S. kastoni (c). The enclosed area is detailed in map 2.

— Epigynal septum extending almost to posterior epigynal margin.............. 26

25. Spermathecae fused medially (fig. 20)................................. kastoni

— Spermathecae not fused medially (fig. 10).. gertschi

26. Epigynal septum greatly narrowed posteriorly (fig. 59)................... prenticei

— Epigynal septum only slightly narrowed posteriorly (figs. 14, 39, 49)........... 27

27. Epigynal septum relatively wide (fig. 39).............................. cajalco

— Epigynal septum relatively narrow (figs. 14, 49)............................ 28

28. Lateral margins of epigynal septum relatively straight, angular (fig. 14)........ bixleri

— Lateral margins of epigynal septum rounded (fig. 49)................... idyllwild