XVIU MONTHLY PROCEEDINGS 



^. — Clypeus, mandibles, dot between antennae, narrow line on each side, 

 narrow line on posterior orbits, scape beneath, upper margin of prothorax 

 indented each side, spot beneath tegulse, line on postsentellum, two spots on 

 metathorax, legs except four anterior femora behind and posterior femora at 

 base and beneath, lateral and apical margin of segments one and two of 

 abdomen, apical margin of three to six, large spot on sides of two, spot near 

 tip of apical segment, most of first ventral, the second except base, and apical 

 margin of remaining segments, all sulphur-yellow; anterior margin of apical 

 bands on third and fourth dorsal segments notched on each side anteriorly; 

 clypeus longer than broad, sericeous, apical margin narrow, truncate ; flagellum 

 fulvous beneath, apical joint black, not hooked. Length .65 inch. 

 Hah. — Nevada. H. K. Morrison. 



Pterochilus decoriis. — 9 • — Medium, black; clypeus, dot above, mandi- 

 bles except tips, anterior orbits, line behind eyes, scape beneath, broad upper 

 margin of prothorax, spot on sides of scutellum, postscutellum, large spot on 

 Bides of metathorax, small spot on extreme sides, round spot beneath wings, 

 small one behind it, and the tegulse, sulphur-yellow ; clypeus subrhomboidal, 

 depressed towards tip which is truncate; tips of mandibles reddish-brown, 

 labial palpi pale ferruginous, fringed with long pale hair; wings subhyaline, 

 Btained witli yellowish-fuscous along costa and at tip; legs yellow, coxae, except 

 spot on two posterior pairs beneath, trochanters, line on anterior femora above, 

 and the two posterior pairs, except tips, black, anterior femora before, and most 

 of the tarsi dull fulvous; abdomen ovate, feebly punctured, subopaque, first 

 segment of abdomen, except large subtrefoil black spot on disk, connected with 

 base by a narrow line, rather broad apical margins of remaining segments, 

 broad lateral margin of second segment acutely produced within neirly to the 

 disk, and most of the venter, sulphur-yellow. Length .50 inch. 

 Hah. — Nevada. H. K. Morrison. 



PterocUilus zonatus.— '^. — Medium, black; clypeus, spot on mandi- 

 bles, narrow lower orbits, line on posterior orbits, short line or two spots 

 between antennse, scape beneath, upper anterior margin of prothorax, tegulse 

 except median dot, spot beneath, dot on sides of scutellum, postscutellum, spot 

 on each side of metathorax posteriorly, tips of femora more or less, tibiae and 

 tarsi, two spots at base of first segment of abdomen, and rather narrow apical 

 margin of all the segments above and beneath, bisinuate or biemarginate 

 anteriorly, all pale yellow; clypeus seven-sided, as long as broad, smooth, tip 

 slightly emarginate; antennae long, robust especially towards tip, flagellum 

 pale fulvous beneath, spoiled at apex with black, apical joint truncate, not 

 hooked; wings stained with yellow, nervures pale ferruginous or fulvous; 

 abdomen narrowed at base, the segments smooth at base, sparsely punctured 

 at apex, first segment campanulate. Length .50 inch. 

 Hah. — Nevada H. K. Morrison. 



Pteroebiliis comptus. — 9.— Medium, black; head broader than 

 thorax; clypeus, mandibles except tips, palpi, lower anterior orbits, posterior 

 orbits, two nearly confluent dots between antennae, scape beneath, broad upper 

 margin of prothorax, tubercles, tegulae, two spots on scutellum, postscutellum, 

 Bides of metathorax, broad oblique subinterrupted line on sides of pleura, spot 

 on under side, legs except four anterior femora above and posterior pair except 



