1897.] NATURAL SCIENCES OF PHILADELPHIA. 345 



blue, with a greenish tint on, the dorsum of thorax and parts of the 

 abdomen ; legs, mandibles and antenna? black. Pubescence rather 

 tbin, entirely black except a very few scattered pale hairs near the 

 tubercles, on scutellum, and sides of metathorax, and rather more on 

 first abdominal segment. Ventral scopa entirely black. Punctua- 

 tion ordinary, punctures of raesothorax dense but not confluent, of 

 abdomen rather close but leaving a shining surface ; median line of 

 mesothorax distinct, basal area of metathorax moderately shiny ; 

 antenna? short ; clypeus ordinary, anterior margin entire ; apical 

 tooth of mandibles very short ; tegulae black ; wings smoky, paler 

 along the nervures ; second submarginal cell about as long as first 

 on cubital nervure ; first recurrent nervure reaching second submar- 

 ginal cell a little before the end of its basal third, second just after 

 the beginning of its apical sixth. 



Hab. — Olympia, Wash., July 4, 1896 (T. Kincaid). Seems near 

 to 0. brevis, but differs in the color of the pubescence, larger size, 

 etc. 



Osniia brevis Cress. 



An authentic Colo. $ specimen, sent by Mr. Fox, does not have 

 the head as large as one would imagine from Cresson's description. 

 The pubescence of the pleura is brownish-black. The abdomen is 

 of a fine dark shining indigo-blue. The second submarginal cell is 

 longer than the first on the cubital nervure ; the first recurrent 

 nervure joins the second submarginal cell somewhat before the end 

 of its basal third, the second quite near its tip. At Pasco, Wash., 

 May 25, 1896, Mr. T. Kincaid took a couple of $ , agreeing with the 

 Colorado insect, though having the second submarginal cell a little 

 shorter. At Olympia, Wash., June 24, July 7, etc., Mr. Kincaid has 

 taken in numbers a species like brevis, but with a more convex, very 

 shiny, dark prussian green abdomen ; I supposed it to be a different 

 species, but leave it for the present with this allusion. It is quite 

 possibly the 9 of inurbana or odontogaster. 



At Pasco, May 25, 1896, Mr. Kincaid also took a couple of males 

 which it seems safe to refer to brevis, although the $ of that insect 

 has not been described. The abdomen is indigo-blue like the $ , 

 but narrow and more shiny ; antennse wholly black, reaching about 

 to scutellum ; pubescence of face, vertex and thoracic dorsum yel- 

 lowish-white, rather copious ; of cheeks, pleura and sides of meta- 

 thorax black ; wings quite hyaline, except a slight stain in the 

 upper part of the marginal cell; dorsal pubescence of abdomen all 



