1896.] NATURAL SCIENCES OF PHILADELPHIA. 75 



Tegulse yellowish hyaline. Wings hyaline, nervures and stigma 

 (except its hyaline centre) very pale yellow. Marginal cell rather 

 long, substigmatal portion about as long as poststigniatal ; a linear 

 appendiculate nervure longer than the marginal itself; 2d sub- 

 marginal rather large, narrowed a little more than half to marginal ; 

 3d discoidal distinct. 



Legs yellow ; a blackish patch on middle femora and tibiae be- 

 behind, hind legs blackish except knees. 



Abdomen above yellow ; first segment narrowly dark at base; at 

 the sutures of all the segments is a narrow black band, which takes 

 the form of two transversely elongate spots on the hind margin of 

 each segment, adjacent to a narrow entire band on anterior margin 

 of the next. None of the bands are united laterally. The yellow 

 is much more developed in proportion to the black than in martini. 

 Venter yellow, immaculate. 



Hab. — Glen wood Springs, Colorado, Aug. 24, 1894. Collected by 

 Prof. Gillette ; sent to me by Mr. Fox. The unique specimen is 

 unfortunately reddened by cyanide. P. luteiceps is very near martini, 

 but differs by the brassy-green (not blue) thorax, the vertex with a 

 transverse yellow band above the ocelli, and in the greater develop- 

 ment of yellow on the abdomen. It is to be added that martini is a 

 spring species, while luteiceps was caught in late summer. It is 

 curious that among the numerous late summer species of Per dita at 

 Las Cruces, the locality of martini, none resemble it so closely as 

 luteiceps. 



30. Perdita dubia n. sp. 



^ . — About or slightly over 5 mm. long. Very like the 3' of 

 hakerce or zebrata, resembling them in the shining mesothorax, color 

 of head and thorax, face-markings, etc. The mesothorax is a rather 

 yellower-green. The supraclypeal mark is heart-shaped with the 

 apex cut off, thus differently shaped from that of bakerce or zebrata, 

 but nearest to zebrata. The dog-ear marks are a little reduced, 

 leaving a perceptible amount of dark color between them and the 

 clypeus. The lateral face-mark, formed as in zebrata, presents an 

 obscure dark streak on its upper portion. The sides of the face are 

 more hairy than in zebrata or bakerce. The cheeks are very hairy. 

 The labrum presents a conspicuous pit. The thorax is rather more 

 hairy than in bakerce or zebrata. The posterior and middle femora 

 are entirely yellow, except for the slightest indication of black on 

 the posterior ones; otherwise the legs resemble those of bakerce. 



