1895.] NATURAL SCIENCES OF PHILADELPHIA. 13 



Thorax smooth and very sparsely punctured, except the blue 

 metathorax, which appears rough from extremely minute and close 

 punctures — one should say rugulose rather thrfh punctured. 



Abdomen piceous, shiny, apex with pale hairs. Sides of 2d, 3d, 

 and 4th segments with a large, pale yellow spot or blotch. First 

 segment with a deep longitudinal groove extending from its base to 

 a little beyond its middle. 



Metathorax with a distinct fovea. A groove near front margin of 

 eye as in phymatcv. Legs dark brown, tips of anterior femora, an- 

 terior tibia? beneath, and anterior tarsi, yellow. Wings hyaline, 

 iridescent, venation brown. 



Recognized among the species with a dark face, by the piceous 

 abdomen with six yellow spots, and the not entirely brown legs. 



Hab.— Santa Fe, N. M., July 25th. (Ckll., 1,647.) 



Perdita semicrocea n. sp. 9. 



About 4 mm. long : head and thorax black, with a bronze-green 

 tint in certain lights. Thorax sparsely punctured, vertex of head 

 finely rugulose. 



Face wholly dark ; antennae brown, flagellum yellowish beneath. 

 Cheeks behind eyes with white hairs. Metathorax finely rugulose. 



Abdomen above orange, deepening in tint towards apex ; first seg- 

 ment mostly fuscous, second with an ill-defined fuscous band along its 

 sides and hind margin, third with rudiments of such a band. Under 

 side of abdomen orange. 



Legs with coxse and femora, except at ends, dark. Ends of 

 femora, and whole of tibise and tarsi of anterior and middle legs 

 primrose-yellow ; corresponding parts of hind legs brownish. 



Wings hyaline, veins colorless, stigma pale lemon-yellow. Third 

 discoidal cell distinct. 



Recognized among the species with a dark face, by its orange 

 abdomen. 



Hab. — Las Cruces, N. M. , on yellow (Composite) flowers on cam- 

 pus of N. M. Agric. College, beginning of October. (Ckll., 2,500.) 



Perdita austini n. sp. <?. 



About 3j mm. long: head and thorax shining black, head with a 

 slight greenish, metathorax with a bluish tinge. Crown of head 

 very finely granular. White hairs on head and thorax sparse. 

 Tegula? canary-yellow. Clypeus yellow with a minute black dot on 



