ART. 4, REVISION OF THE FAMILY THEREVIDAE—COLE, 87 
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ING 
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All the wing veins black; first antennal joint slightly shorter than the third; 
eastern species... ...-- site. t-u' @lbifrons Say. 
Costa to near tip oe See peel ee e Ra: velo ntah eee RpeCIEs: a e./.54.. 13. 
Knob of halteres blackish; upper forceps of genitalia long and eed 
cockerelli, new species. 
Knob of halteres white; upper forceps of genitalia not slender and curved. 
vialis Osten Sacken. 
Knob of halteres white -. eos oe seers .cizah). J fotiosa,Coquillett: 
ieeohieaieiicres Wlacidsh brown j SMe aa epreree deere... LD. 
Pile of frons and sides of face long aad place ahs SEA oe 3 - Binaries Kroéber. 
Pile of frons yellow or white........-. Pye buses 
Pile of frons yellow; small nem of iia blscies: ee “yanduzeei, new species. 
Pile of frons white; small hairs of tibiae white........... niveipennis Kroéber. 
Femora yellowish, at least on the apical third......2.......-.-......2-.-. 18. 
Femora black to the tips.. Re PPLE NA Ase sir 24. 
Thorax with three broad ee black striped! alt atte tent eek 19: 
Thorax without shining black vittae........ Has see Pee aes, 20: 
Abdomen largely shining black; aritentiae blacies: .-.-.---- hirticeps Loew. 
Abdomen largely yellow; antennae yellowish................... fueata Loew. 
Wings thickly marked with dark brown..........-.-....- bakeri, new species. 
Wings hyaline or with narrow borders to some veins .. .. .- mee 21. 
Frons without black pile; femora yellow to base....-..-.-- " duplicis Coquillett. 
Frons with more or less black pile .......--..-.-.---- oes . 22. 
Knob of halteres yellow, western species........-.-- pseudoeulata, new epecios: 
Knob of halteres blackish or brown......-.-.---- 2 Liter - 2s 
Pile of abdomen white and not very long: ene alos fe hase! en species. 
flavicincta Loew. 
Pile of abdomen yellow, unusually long and dense; femora black to beyond 
middle; western species.....................------ flavipilosa, new aes 
Abdomen*entirelypollineseisi.h Skt Seeioas ep wildness . 25. 
Abdomen in part shining haces See bras: od . 26. 
Abdomen brownish black pb linea: “third eae ean 4 as doris as aes 
egressa Coquillett. 
Abdomen yellowish pollinose; third antennal joint three-fourths as long as first. 
johnsoni Coquillett. 
Wings more or less clouded and marked with dark brown; veins broadly bordered 
with brown . * woe ds EI2h 
Wings largely ‘eine the v veins peomieunnes Sane hondered with Bee e290: 
Dorsum of thorax unstriped..........-.-.-.-.------------ aurofasciata Krober. 
BD OrsuTPOCMMOTAX! Viblabel |. le eee ns oo Soe noe ep bs Be see enact ae 
Abdomen with pollinose bands..............-.-.-------------- comata Loew. 
Abdomen without pollinose harkens ot ......- nebulosa Kroéber. 
The halves of the hypandrium of the Orica a with a rather long apical 
process which reaches beyond the upper forceps and is directed inward. 
cingulata Kréber. 
The plates of the hypandrium with short processes. . : a0: 
Pile of body almost euler black; all re of mesonotum and ‘dorsum of abdomen 
black . : id Se See Mer soso: be ne bw 
Pile of bady Tees aie. or eealloeaiee 2 le Asta ee nv Oe 
Thorax distinctly vittate; hypandrium ies Hye: short enonlice peri 
foxi, new species. 
Thorax very faintly brown vittate; hypandrium with quite long processes. 
nigripilosa, new species. 
