Perdita (Xerophasma)

Griswold, Terry & Miller, Wensdae, 2010, A Revision of Perdita (Xerophasma) Timberlake (Hymenoptera: Andrenidae), Zootaxa 2517 (1), pp. 1-14 : 4

Key to species of Perdita (Xerophasma)

1 Female ........................................................................................................................................................................... 2

- Male ............................................................................................................................................................................ 6

2 Entirely pallid, cream to tan on head and mesosoma .................................................................................................. 3

- Dark brown above antennal sockets, dark brown markings on mesoscutum, propodeum........................................... 4

3 Ocelli greatly enlarged, ocellar diameter nearly 1/3 width of interocular distance at level of median ocellus ( Fig. 4 ); large (forewing length> 7 mm) .............................................................................................. bequaertiana Cockerell

- Ocelli moderately enlarged, ocellar diameter approximately 1/5 width of interocular distance at level of median ocellus ( Fig. 2 ); small (forewing length <7mm) ........................................................................... pallida Timberlake

4 Frons dark throughout ( Fig. 1, 3 ); gena narrower than eye in lateral view; mesoscutum either dull or densely punctate ................................................................................................................................................................................ 5

- Frons with small dark mark above each antennal socket ( Fig. 5 ); gena broader than eye in lateral view; mesoscutum polished and sparsely punctate ......................................................................................................... rhondae Griswold

5 Mandible without preapical tooth ( Fig. 3 ); clypeus entirely cream-colored; mesoscutum golden brown or dark with 'U' shaped yellow marking, surface shiny, rather densely punctate ............................... vespertina Griswold & Miller

- Mandible with preapical tooth ( Fig. 1 ); clypeus with medial dark band; mesoscutum entirely dark, surface dull, very sparsely punctate ............................................................................................................... ce ladona Griswold & Miller

6 Supraclypeal area with conical protuberance and dense tuft of erect, apically bent hair; clypeus densely punctate..... ........................................................................................................................................................... rhondae Griswold

- Supraclypeal area flat, without tuft of hair; clypeus very impunctate medially .......................................................... 7

7 Face cream or golden brown above antennal sockets, with little contrast to clypeus and paraocular area; facial fovea distinct, tear-drop shaped, or ellipsoid ......................................................................................................................... 8

- Face dark brown or black above antennal sockets, in distinct contrast to yellow clypeus and paraocular area; facial fovea indistinct, slightly oval .......................................................................................... celadona Griswold & Miller

8 Ocelli not greatly enlarged, 1/5 width of interocular distance at level of median ocellus; frons cream to pale yellow above antennal sockets ................................................................................................................................................ 9

- Ocelli large, 1/3 width of interocular distance at level of median ocellus; frons golden brown above antennal sockets .................................................................................................................................................. bequaertiana Cockerell

9 Ocelli not bordered by dark lines except sometimes a single fine line medially between two lateral ocelli; prestigma pale in contrast to dark vein R; stigma without dark posterior margin; facial fovea tear-drop shaped ......................... ......................................................................................................................................................... pallida Timberlake

- Dark markings present at least anterior to lateral ocelli, often more extensive in ocellar region; prestigma dark, similar to vein R; stigma with dark posterior margin; facial fovea elongate ellipsoid ....... vespertina Griswold & Miller

Figures

FIGURES 1–20. Female heads (1–5), dorsal (6–10) and lateral (11–15) views of male genitalia, and male sternum 8 (16–20) of Perdita (Xerophasma). Perdita celadona (1, 6, 11, 16), P. pallida (2, 7, 12, 17), P. vespertina (3, 8, 13, 18), P. bequaertiana (4, 9, 14, 19), P. rhondae (5, 10, 15, 20). Shaded areas indicate dark markings on female heads.