1896.] NATURAL SCIENCES OF PHILADELPHIA. 91 



the abdomen is not so conspicuously marked. Yet in all essential 

 particulars it agrees so nearly with affinis that it might well be 

 deemed a southern race of it. The clypeal markings vary as in 

 affinls. On Sept. 20th, I took one example of P.Jallax on flowers 

 of Verbesina encelioides, and on Sept. 17th, three on Pedis 2)apposa. 



52. Perdita phymatae Ckll., Proc. Phila. Acad., 1895, p. 12. $. (Hab., Las Cruees 



N. M.). 



In the original description the legs are described as dark brown 

 without markings, but in the normal form of the species the knees 

 are all pallid and the anterior tibia? are yellow in front, as in fallax. 

 The original type specimen, now in Coll. Am. Ent. Soc, was ex- 

 amined for me by Mr. Fox, who reports that the yellow is repre- 

 sented by pale testaceous. 



The mesothorax is minutely sculptured, though shining. The 

 second subraarginal cell is large, and narrows more than half to 

 marginal; 3d discoidal distinct. The clypeus is strongly punctured, 

 and frequently presents a small yellow median spot. Glossa not 

 hairy. 



This species was common on Bigelovia xvrightii at Las Cruees, 

 Sept. 23, 1895, but the $ has not been observed. It was also taken 

 on B. wrightii on Sept. 2d, together with P. nitidella, P. hdeola, 

 Halidus stultus and Prosopis. On Sept. 25th, it was taken on Gutler- 

 rezia sarothrce var. inicrocejihala, together with P. semicrocea, etc. 



53. Perdita aeneifrons n. sp. 



9 . — Length 5 mm. Head dark green with the front very dis- 

 tinctly brassy, and the clypeus black ; thorax pitch black, with the 

 metathorax dark green. Abdomen black, shiny, without bands or 

 spots, venter dark subolivaceous brown. 



Head rounded, of ordinary size, not broader than long, vertex 

 minutely rugulose and very sparsely punctured. Clypeus shining 

 prominent, high, but not produced laterally to bases of mandibles, 

 very sparsely punctured on its lower portion. Mandibles pale yel- 

 low at base, rufescent otherwise, with a distinct tooth on inner side. 

 Face all dark, medially free from hairs, laterally with short hairs. 

 Cheeks moderately hairy. Antennae dark brown. 



Mesothorax shining, perfectly smooth, bare ; except its anterior 

 border, which presents short hairs and is very feebly sculptured, and 

 even presents in some lights a vague greenish tinge. Scutellum 

 bare, postscuteilum with a thin fringe of white hairs. 



Metathorax granular. Prothorax, even including tubercules, 



