arr, 4, REVISION OF THE FAMILY THEREVIDAE—COLE. 89 
14. 
15. 
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17. 
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27. 
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29. 
Frons shining black except for silvery lower corners; small Psilocephala-like 
species.......- ..-. Pygmaea, new species. 
Frons with the pollen 1 more pertended: Cees soil more typical species..... 15. 
Frons with one shining black spot, aseally cordate and convex...........-- 16. 
Frons with two shimmy black! marks i) Sie seees fas eh 2 eee ae 
Femora black.......- 1 RTOS, avererest eis ase gd ghia 
Femora Tole or “earn ae saya ie es aE Sieh Pe era ai Behe ors sede Os 
Upper two-thirds of frons entirely shinine hacks 52. > .e Strigipes Loew. 
Black of the frons reduced to a smaller area by the pollen Aa es eee) Ses tral 
The brown areas of mesonotum appearing as three broad, dark-brown vittae; 
frons dark-yellow pollinose........2. 212... 202020. brunnea, new species. 
The mesonotum more gray in color; pollen of the face yellowish gray...... 19. 
Thorax with the markings pale; scutellum gray pollinose; western species, pile 
Olpra Cem whiter 454 vom oe aan rare ce Sayin Olen’ a acre pera os cingulata Krober. 
Thorax with markings pale; scutellum with brown spot; pile of face yellowish. 
neomexicana, New species. 
Thorax with three distinct dark vittae; scutellum with a brownish spot at the 
base; eastern species, face white pilose..................---- frontalis Say. 
Thorax ;with-three, broadijshining black svittae. << £:< <<< aye'o,ci20 «j=, sj0 oslo 7A 
horemomwatnomt shaming DIACK Witten... 6a fey at eine has aii ween a em te 22. 
Abdomen largely yellow; first antennal joint yellow............. fucata Loew. 
Abdomen largely shining black; first antennal joint black..... hirticeps Loew. 
Wings marked with dark brown; dorsum of abdomen largely yellow; thoracic 
Viton GA TIG, HT pics steers res eee Doe Os Pee Ba bakeri, new species. 
Wings almost hyaline, dorsum of abdomen largely black............-....- 233 
Frontal callosity separated from the lower ocellus by pollen; thorax with a me- 
diamsblack Stripes. cys see iin s aia =ine eee ane ersteto ees diversa Coquillett. 
Frontal callosity reaching the lower ocellus; thorax without median black stripe; 
CAStErM BPCClEs ss... de see ee ae aoe ae eee a ee teaab ee flavicincta Loew. 
The shining black spots of frons projecting in two hemispherical, eyelike knobs. 
pseudoculata, new species. 
ithe frontal’ callosities not projecting thusts).2 cee. os) 6 Seca 4 20s 
Hemora yellow or larcely yellow ...<- cb... -/2-ceseeicyesadsct estes sete 220s 
Femora black >. 2.2.22. ey acters Ree 27. 
Femora wholly yellow: frst antennal jai black. PEO. SEL " duplicis Coquillett: 
Front femora black except apex, the hind femora black basally; first antennal 
joint yellow......... er . flavicauda Coquillett. 
The shining enews ariel ane Hiss than die Seema and almost touching 
in the middle; cross veins narrowly bordered brown..........-.-.-.--.-. 28. 
Frontal spots very narrow; wings densely mottled with brown ay maar. ARS 29: 
Third antennal joint three-fourths as long as the first; abdomen yellowish brown 
pollinose; last two segments shining brown...... . . johnsoni Coquillett. 
Third antennal joint about as long as first; abdomen Ginga brown pollinose; 
last two segments shining blackish...................-.- egressa Coquillett. 
Abdomen with pollinose bands................---------------- comata Loew. 
Abdomen without pollinose bands...................-...--. nebulosa Kréber 
THEREVA PYGMAFA, new species. 
Plate 10, fig. 127; plate 11, figs. 143, 144; and plate 12, fig. 165. 
Male.—-Length 5.5mm. A small Psilocephala-!ike species, largely 
shining black. Head black, the eyes contiguous for only a short 
distance; upper corner of the frontal triangle without pollen, the 
