1897.] NATURAL SCIENCES OF PHILADELPHIA. 341 



ventral scopa, black, but there are some shining pale hairs along the 

 hind margin of the scut ellum, and sparsely on the abdominal dorsum ; 

 the extreme apex of the abdomen, the anterior edge of the clypeus, 

 and the outer surface of the mandibles exhibit some orange pile ; 

 the pubescence of the tarsi, especially the anterior ones, is also more 

 or less of a pale orange tint. The hairs of the face and vertex are 

 wholly black, and the tuft just behind the icings is black. Punctua- 

 tion ordinary, not quite so dense as in some related species ; ocelli 

 light yellowish, clypeus ordinary; tegulse shining black; wings 

 smoky ; second submarginal cell perhaps a very little longer than 

 first on cubital nervure ; first recurrent nervure reaching second 

 submarginal cell slightly before the end of its basal third, second 

 very near its end. 



Hab.— Olympia, Wash., May 23, 1894 (T. Kincaid). Resembles 

 tristella, but easily known by the characters italicized. 



Osmia trevoris n. sp. 



9 . Length 8 mm., stoutly built, head quite large, abdomen short 

 and broad. The thorax is by no means so broad as in cyanella. 

 Head, thorax, and abdomen very dark blue, the two latter a slightly 

 greenish-blue, yet bluer than in nanula; legs, mandibles and anten- 

 na? black. Pubescence of head black, except some fulvous on occi- 

 put, hairs of face long, all black ; pubescence of pleura black, of 

 thoracic dorsum moderately dense, and orange-fulvous, with a few 

 dark hairs intermixed, not readily noticed ; tuft behind ivings orange- 

 fulvous; hairs of femora and tibiae short and black, or tarsi dull 

 fulvous ; dorsal pubescence of the abdomen entirely black, except a 

 thin, pale fulvous fringe along the hind margins of the segments, 

 only noticed in certain lights; ventral scopa all black. Punctua- 

 tion ordinary, punctures of vertex and mesothorax close but separ- 

 able. Clypeus ordinary ; tegulse black ; wings dusky hyaline, with 

 the broad outer margin and the upper part of the marginal cell con- 

 spicuously darker; second submarginal cell a little longer than first 

 on cubital nervure; first recurrent nervure joining second submar- 

 ginal cell at about the end of its basal third, second a very short dis- 

 tance before its tip. 



Hab.— Seattle, Wash., May 19, 1896 (Trevor Kincaid). This is 

 closely related to 0. nanula, but it is somewhat broader, with a 

 larger head, and lacks the pale pubescence at sides of face, while 

 the pubescence of the thoracic dorsum is dense and much more 

 highly colored ; the abdomen, also, is less globose. 0. trevoris re- 

 23 



