1896.] NATURAL SCIENCES OF PHILADELPHIA. 79 



into a large frontal patch, so that the whole has the shape of an 

 hour-glass. The frontal patch is separated by a moderately wide 

 interval from the anterior ocellus. Dog-ear marks present but 

 small, their tips about level with the top of the clypeus. Lateral 

 ftice-marks receding from the clypeus close to the dark dots, leaving 

 a wide band of dark color between them and the upper part of the 

 clypeus, etc. ; at the level of the antennal sockets they are suddenly 

 narrowed, ascending the orbital margin as a thin band, rather sud- 

 denly widening opposite the middle of the frontal patch, and termi- 

 nating roundly and abruptly at the level of the hind margin of the 

 anterior ocellus. Lower part of cheeks pale yellow. 



Prothorax and narrow lateral borders of mesothorax yellow- 

 Pleura entirely dark. Metathorax blue, rugulose, contrasting with 

 the scutellum, postscutellum and mesothorax, which are brassy- 

 greenish, very smooth, shining, polished, the scutellum with distinct 

 sparse punctures. The vertex is green, but rugulose and punctured. 

 Legs as in $ , but hind tibia and tarsus all brown. Wings with 3d 

 discoidal cell distinct ; 2d submargiual narrowed less than half to 

 marginal. 



Abdomen -above yellow ; markings dark sepia, first segment dark 

 at base, connecting with a blotch on each side, hind margins of seg- 

 ments 1-4 with dark bands, connecting laterally with a spot on 

 proximal margins of 3 and 4, but these spots lacking on fifth seg- 

 ment, while the bands on 1 and 2 are broadly confluent along lateral 

 margin. Vertex yellow, immaculate. 



This is very different from the 9 of nitidella. 



Two species found in spring in the Mesilla Valley, N. M., habits 

 unknown, 9 unknown. 



37. Perdita martini Ckll., Proc. Phila. Acad., 1895, p. 14. c?. (Hab. Las Cruees, 

 N. M.). 



The unique specimen was taken on April 26th. 



38. Perdita hirsuta n. sp. 



$ . — Length about 5 mm. Head and thorax blue, granular, 

 unusually hairy with white hairs, but the disc of metathorax, and 

 yellow face below antennre, bare. Head of ordinary size, rounded, 

 a little broader than long; cheeks unarmed. Face just above the 

 level of the antennae conspicuously hairy, the hairs arranged so as to 

 appear to radiate from the antennse. Antennre black above, yellow 

 beneath, the scape with only a black blotch above. Mandibles very 



