1896.] NATURAL SCIENCES OF PHILADELPHIA. 93 



the antennpe brown-black or dark brown above. The ^ has the 

 cheeks unarmed. 



When left too long in a damp cyanide bottle the $ turns a bril- 

 liant crimson all over. 



A species found in Neiv Mexico, habits and exact locality unhiown. 



56. Perdita nuda n. sp, 



9 . — Length 7i mm. Head and thorax green, legs and abdomen 

 dark chocolate-brown. The body in general is remarkably free 

 from hairs ; the face is bare but the occiput and cheeks present 

 scattered short hairs; the thorax is practically bare, even including 

 the pleura and sides of metathorax ; the tip of the abdomen has a 

 fairly dense fringe of hairs ; the tibise and tarsi are quite hairy, the 

 hairs of a dull whitish color. 



Head of ordinary size, a little broader than long, dark green, the 

 face very flat, vertex granular, clypeus punctured. There are no 

 face-markings except an oblong dull yellow spot on the clypeus. 

 Basal ))ortion of mandibles yellow with a large dark spot. Glossa 

 not hairy. Antennre brown-black ; flagellum whitish, scape and 

 funicle testaceous beneath. 



Thorax dark olive-green, metathorax bluish ; the whole rather 

 dull and finely sculptured. The pleura is quite shiny, but still 

 sculptured. There are no pale marks on the thorax, but the tuber- 

 cles, quite prominent, are dark brown. 



Teguloe hyaline with an opaque spot in front. Wings milky-hy- 

 aline, nervures and stigma dark brown, the latter pallid in middle. 

 Marginal cell with the poststigmatal portion as long or a little longer 

 than the substigmatal. Second submarginal large, narrowed more 

 than one-half to marginal. Third discoidal distinct. Anterior 

 knees, and anterior tibise in front, pale yellow. Abdomen above 

 and below dark brown, without any pale markings. Tip eraargi- 

 nate. 



Hab. — New Mexico, one specimen sent by Mr. Fox. Locality, 

 «tc., unknown. It resembles P. phymatce, but is much larger than 

 that or asteris. P. asteris has a hairy raesothorax ; phymatce has a 

 nude mesothorax, but is much more shiny as well as being so much 

 smaller. P. semiccerulea has a hairy mesothorax. 



A species found on Aster eanescens. 



57. Perdita asteris u. sp. 



9 . — Length about or hardly 6 mm. Head very dark blue, 



