1896.] NATURAL SCIENCES OF PHILADELPHIA. 107 



linear groove, extending down on the ridge as far as the level of the 

 anteunal sockets, Clypeus cocked-hat-shaped, but rounded and 

 broad above, and unusually high, entirely pale yellow except the 

 usual two dots. Lateral pale yellow face-marks triangular, the in- 

 ner angle opposite the clypeal dot, the upper angle (of about 40°) 

 level with the antennal sockets, on the orbital margin. The inner 

 side of the triangle is straight or nearly so, not notched as in bige- 

 lovloi. Supraclypeal and dog-ear marks absent. Mandibles simple, 

 with the basal three-fifths very broad and pale yellowish ; and the 

 terminal two-fifths strongly bent inward, dark rufous-brown, 

 slender, coming to a point. Antennae with the scape all yellow, fun- 

 icle yellow with a brown blotch above ; flagellum brown, dark 

 above, pale below, first joint all yellow below. 



Thorax, including mesothorax and pleura, quite hairy, disc of 

 metathorax bare. The abundant short bristles on the mesothorax 

 have a yellowish tinge. Pleura all dark. Collar and hind border 

 of prothorax broadly, connecting with tubercles, pale yellow. The pro- 

 thorax is thus practically all yellow except a large wedge-shaped 

 portion on each side. Mesothorax shiny. 



Tegulse hyaline, with a yellowish opaque subreniform mark. 

 AVings hyaline, nervures and stigma pale brown, the latter not cen- 

 trally hyaline. Marginal cell long and rather narrow, squarely 

 truncate, its poststigmatal portion much the longest. Second sub- 

 marginal large, not narrowed half to marginal. Third discoidal 

 distinct, rather narrower below than is usual. Legs hairy ; femora 

 yellow, middle femora with a little brown at base below. Tibiae 

 and tarsi pale brown ; anterior tibiae yellow in front and with a yel- 

 low streak behind. 



Abdomen above with about equally broad dull yellow and black 

 bands, the latter five in number, but the last not so well-defined. 

 First segment with an oblique black mark on each side before the 

 band. The first baud touches on each side a black longitudinal 

 groove such as is seen on the side of the second segment in luteola 

 9 . The second and third bands present a small lobe on each side 

 below. The fourth band below has a median projecting tongue. 

 Venter pale dull yellow, broadly mottled with brown medially. 



Hab. — Southwest Utah, collected by Mr. Palm, sent by Mr. C. 

 F. Baker, one specimen. Type in coll. Baker. 



This, the first Perdita recorded from Utah, belongs near albipen- 

 nis, etc., but will be readily I'ecognized by the characters I have 

 italicized. 



