1896.] NATURAL SCIENCES OF PHILADELPHIA. 57 



cell rather loug, very distinctly appeudiculate, poststigmatal portion 

 a little longer than substigmatal. Second submarginal rather large, 

 narrowed hardly one-half to marginal, the narrowing more proximal, 

 than distal. Third discoidal distinct. Cubital and subdiscoidal 

 nervures produced almost to wing-margin. 



Legs sepia-brown ; anterior tibise in front, and a stripe on middle 

 tibiae, yellow. 



Abdomen shining, sepia-brown, darker toward the apex ; venter 

 nearly the same. There are well-defined yellow marks at sides of 

 segments 2-5, partly passing over to the venter. 



Hab. — Mexico, one example sent by Mr. Fox. Unhappily we 

 know nothing of the exact locality or habits of this interesting species. 

 It is the only Perdita I know with a yellow postscutellum. 



Two species from Nevada, known only in the $ ; exact locality and 

 habits unknown. 



8. Perdita zonalis Cr., Tr. Am. Ent. Soc, 1879, p. 202. 9 (Hab., Nevada). 



Ten specimens were collected by Morrison. From one of these I 

 have noted as follows : 



Clypeu? low cork-helmet type, reaching base of mandibles. 

 Mesothorax excessively shiny, dark brassy-green, very sparsely but 

 distinctly punctured. Face markings pale yellow. Upper margin 

 of clypeus medially truncate, not rounded. Clypeus all yellow 

 except two dark dots. Supraclypeal patch well-developed, broad, 

 but not twice as broad as long. No dog-ear marks. Sockets of 

 antennse narrowly ringed with yellow. Lateral face marks trian- 

 gular, rather broad, coming to a point at level of insertion of 

 antennse. Upper margin of face marks not forming a W but V V. 

 Stigma and nervures pale testaceous, stigma large, marginal cell with 

 poststigmatal portion longer than substigmatal. Second submarginal 

 large, narrowed one-half to marginal. Third discoidal distinct. 



Abdomen above yellow with four black bands, and a black mark 

 on each side of first segment. The abdomen is peculiar for the 

 black bands being very distinct, neither notched nor interrupted in 

 the middle, and narrower than the yellow between them. 



From zebrata and bakerce it may be known by the black bauds of 

 abdomen not being united on lateral margin, the anterior tibiae all 

 yellow, the lateral triangle of face broader and the face markings 

 lemon-yellow. From salicis 9 it is distinguished at once by the 

 very much broader lateral face-marks. 



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