208 E. T. CRESSON. 



spot; sixth segment yellow, its apical margin, which is truncate, and stripe 

 down the middle black ; ventral scopa ochraceous. Length .55 inch. 



ffah. — Nevada, (Morrison). One specimen. Easily recognized by 

 the dilated lateral margin of abdominal segments 2 — 4. 



Antliidiiiin pudicum.— 'J, .— Small, black, head and thorax thinly 

 clothed with pale pubescence; sides of face, clypeus, spot above, dot behind 

 summit of eyes, mandibles except tips, two small spots on anterior margin 

 of mesothorax, broad margin of tegulse and spot on large scale in front, all 

 white; thorax finely punctured, the scutellum has sometimes a narrow curved 

 whitish line interrupted medially; wings smoky at tips, second recurrent 

 nervure passing beyond the apex of the second submarginal cell; knees, line 

 on four anterior tibiae and basal joint of tarsi, and spot at base and apex of 

 posterior tibise, white; posterior coxee with a stout white spine; abdomen 

 convex, strongly punctured, shining, incurved at tip, a white spot on each 

 side of first segment and a line on the middle; segments 2 — 5 each with a 

 white band, narrowed and slightly interrupted in the middle and more or less 

 deeply emarginate on each side posteriorly, giving the band a bisinuate appear- 

 ance; terminal segment broadly white at tip, the apical margin trilobate, the 

 lateral lobes broad and rounded. Length .30 inch. 



j£ah. — Nevada, (Morrison). Two specimens. This is allied to 

 parvum Cress. 



Aiithidiuin piidcns. — 9 . — Small, black ; head and thorax very densely 

 punctured; spot on each side of face, short line behind the summit of eye, 

 two dots on anterior margin of mesothorax, two narrow lines on scutellum, 

 spot on teguliB and spot on scale in front, white; wings dusky, especially in 

 marginal cell and at apex, second recurrent nervure passing beyond the apex 

 of second submarginal cell; legs with short griseous pubescence, a white spot 

 at base of all the tibiae; abdomen shining, sparsely punctured, a spot on each 

 side of first segment and a line on middle, four equidistant spots, arranged in 

 a transverse line, on segments 2—4, and two spots on middle of fifth segment 

 all white; ventral scopa pale yellow. Length .30 inch. 



JIah. — Nevada, (Morrison). Two specimens. This may prove to 

 be the 9 of pudicum. 



Megacliile earboiiaria.— 9.— Rather narrow, feebly punctured, shin- 

 ing, black, the pubescence, which is sparse on disk of thorax and abdomen, 

 black; wings dusky on apical margin; abdomen subcouvex, clothed with a 

 short erect black pubescence, sparse on the disk, more dense at sides and on 

 basal segment, no fringe on apical margin of the segments; ventral scopa 

 black. Length .50 inch. 



Hah. — Nevada, (Morrison). Two specimens. 



Megacltale subiiigra. — 9. — Black, clothed with black pubescence, that 

 on thorax above, a tuft beneath tegulae, first segment of abdomen and lateral 

 apical margin of second segment, whitish ; head and thorax rather closely punc- 

 tured; disk of thorax almost nude; wings clear; legs shining the pubescence 

 black; abdomen short, shining; ventral scopa black. Length .45 inch. 



-j^.—Form parallel; the pubescence on head, thorax, anterior femora be- 

 neath, and base of abdomen long, dense and whitish, that on the face very 



