100 ' PROCEEDINGS OF THE ACADEMY OF [1896. 



eral pale marks subtriangular, the inner angle next to clypeal dot, 

 the upper one (of about 30°) on a level with the antennal sockets. 

 Mesothorax dullish, finely punctured as well as very bristly. Disc 

 of metathorax bare and shining, with very fine striatulate sculpture. 

 Prothorax (including tubercles) yellowish-white, except a transverse 

 dark line widening centrally into a large dark patch. 



Tegulte hyaline. Wings hyaline, nervures and stigma very pale 

 yellowish. 



Stigma small ; marginal cell long, its poststigmatal part much 

 the longest. Second submarginal large, subtriangular, narrowed 

 considerably more than half to marginal. Third discoidal distinct. 

 Legs yellowish-white, posterior tibia very hairy ; anterior femora 

 below, except at distal end, a patch on anterior tibire behind, mid- 

 dle femora below, a patch on middle tibiae behind, hind femora 

 with a band above and an oblique streak near base within, hind 

 tibire, except proximal fourth and middle and hind tarsi, black. 



Abdomen above white with black bands. First segment with two 

 black spots in front, and a large broad black triangle, having for 

 its base the whole distal margin of the segment. Segments 2-4 

 each with a distal black band, which is swollen in front sublaterally, 

 and behind laterally, the swelling or patch in the latter case being 

 on the next segment. Tip of abdomen dark brown, the pygidial 

 area smooth and shining, though microscopically subpunctate, ex- 

 treme tip rather broadly truncate, subemarginate. Venter mostly 

 black, with a white spot on hind margin of each segment, and the 

 sides largely whitish. 



Mut. 9 • — The dark triangle on first abdominal segment with a 

 small central light triangle. Abdominal bands broader, and con- 

 tinuously invading the segment following. 



Hah. — Las Cruces, N. M., on flowers of Yerbesina encelioides, one 

 taken by Mr. A. M. Holt in the fall of 1895, and one by myself on 

 Oct. 5th. A very beautiful and distinct species. It differs at once 

 from albovittata hy \ts larger size, non-hairy clypeus, lateral face- 

 markings narrowing above, etc. 



65. Perdita albovittata Ckll., Proc. Phila. Acad., 1S95, p. 15. $. (Hab., San 

 Augustine, N. M.). 



The two specimens taken at San Augustine on Aug. 29th are both 

 females, not ^ and 9 , as formerly stated. Miss Mae Gilmore took 

 a 9 in the Mesilla Valley, close to the Agricultural College, Sept. 

 23d, on Verbesina encelioides. 



