1896.] NATURAL SCIENCES OF PHILADELPHIA. 95 



green, even including the metathorax ; conspicuously granular. 

 Head a little longer than broad ; face practically hairless, cheeks 

 and occiput with short' whitish hairs. Vertex depressed between 

 ocelli and orbits. Mandibles stout, simple, gradually tapering, 

 blunt at tips, pale yellowish with the apical half rufescent. Anten- 

 nae very dark brown, dull pale yellowish beneath. Face-markings 

 cream color, very distinct, restricted to clypeus and side's of face. 

 Clypeus high, flattened above, prominent, cream color with broad 

 black bars. Supraclypeal region dark, elevated, convex. Lateral 

 face-marks club-shaped, rapidly narrowing and continuing upward, 

 to a subtruncate termination on a level with the antennal sockets. 



Thorax nearly hairless, as in P. nuda ; the greater part of tuber- 

 cles, and a broadly triangular patch on each side of hind margin 

 of prothorax, shining pale yellow. (In nuda these pale markings 

 are lacking.) Tegulse hyaline, with a kidney-shaped pale yellow 

 opaque patch. AVings slightly smoky, uervures and stigma dark 

 brown, the latter pallid in center. Marginal cell rather long, ap- 

 pendiculate, its poststigmatal portion a little the longest. Second 

 siibmarginal large, subtriangular, narrowed more than half to mar- 

 ginal. Third discoidal distinct. Legs black, knees ])allid, anterior 

 tarsi testaceous, anterior tibise yellow in front, middle tibiae with a 

 yellow stripe in front. 



Abdomen above black, with eight creamy-white marks, just like 

 those of affinis. Venter piceous. 



Mut. 9 . — The abdominal pale marks reduced to six, the last two 

 failing, one specimen. 



Hab. — Las Cruces, N. M., six examples on flowers of Senecio 

 douglasii, collected by Prof. E. O. Wooton, Oct. 9, 1895. 



This interesting species is extremely close to affinis, and would be 

 taken for it upon superficial examination. It differs, however, by 

 the somewhat longer head, the narrower lateral face marks, the 

 larger size, and especially by the glossa presenting only a small 

 patch of hairs near its tij), whereas in affinis it is strongly hairy for 

 a considerable distance. P. odoinaculata has the glossa also more 

 hairy than in senecionis. 



A small species found on Chrysopsis villosa. 

 59. Perdita vespertilio n. sp. 



S . — Length about 4 mm. Head and thorax shining black. 

 Cheeks unarmed. Head rather large, especially. in comparison with 



