24 Myron Harmon Swenk 
versely rugose and with a feeble median line, the neck very narrow, con- 
cave and polished, the surrounding areas and lateral faces opaque, minutely — 
punctured and feebly reticulated; the sculpture of the metathorax thus 
almost exactly as in skinnert. Pubescence of thorax above grayish tinged 
with ochreous and much mixed with black, with the usual dense fringe of 
this color on scutellum. Post-tegular line, postscutellum, meso- and 
metapleura with long whitish pubescence. Tegulae black. Wings long, 
somewhat darkened, nervures and stigma blackish. Legs black, clothed 
with whitish pubescence with the usual reddish tarsal tufts, basal joint of 
hind tarsi three and one-third times as long as broad. Anterior coxae 
without distinct spines. Claws ferruginous and deeply medially toothed. 
Tibial spurs dark testaceous, outer posterior ones finely pectinate. Abdo- 
men very large and stout, subconical, first segment shining, with coarse, 
round, deep punctures separated the width of one or less, these becoming 
finer and denser on the depressed apical margin, medially with a subim- 
punctate line. Segment 2 more finely punctured, very finely so on the 
depressed basal and apical margins, 3 and following finely and irregularly 
punctured, the apical margins of 3 and 4 depressed.’ Fasciae narrow, white, 
on apices of 1-5 and base of 2, all complete, segment 1 with erect, long, 
sparse, gray hair, following segments with very short, scattered, dark 
hairs, longer on apex. 
3d. Length 15 mm. Differs from the 2 as follows: Pubescence longer 
and denser, the clypeus covered with a dense, ochreous gray, silky beard; 
antennae with joint 3 shorter than 4 or 5, the proportion being 4:6:7, the 
median flagellar joints one and three-fifths times as long as broad; malar 
space longer, about three-eighths as long as broad; base of segment 2 not 
fasciate; basal joint of hind tarsi four times as long as broad. 
Genitalia.—Stipes notched, its apex very small, hairy, its basal and mid- 
dle joint very stout; sagittal rods very stout, gradually tapering from base 
to the divergent apices, their axes converging except at apex; volsella 
moderate; seventh ventral plate fan-shaped and prolonged externally into 
recurved processes, each bearing a long slender chitinous hook on the 
lower angle, internal costa with long dense hair, external costa subglab- 
rous, lobes subuniformly sparsely hairy. (Plate 1, figures 4 and 4a.) 
Type Locariry.—West Fork of Gila river, New Mexico; co- 
types in collection of Professor Cockerell and Philadelphia Acad- 
emy of Natural Sciences. 
This large, striking species was described by Professor Cock- 
erell from two male cotypes collected July 16 by Mr. C. H. T. 
Townsend. Later he published additional records; a male from 
Prude’s Summit, White Mountains, July 29, 1898 (C. M. Bar- 
ber), three females July 21 and three females August 1, from 
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