1897.] NATURAL SCIENCES OF PHILADELPHIA. 335 



vertex. Facial triangle higher than broad ; the face may be all 

 blue, or green with the lower portion blue ; the thin pubescence, 

 even on the clypeus, is black and pale intermixed ; cheeks about as 

 broad as eyes ; antenna? wholly dark ; anterior edge of clypeus a 

 little produced, black, broadly truncate, sometimes a little depressed 

 in middle; mandibles with two large teeth, the third tooth, if pres- 

 ent, is not visible when they are closed ; thorax with mixed black 

 and pale hairs, especially long on scutellum ; basal area of meta- 

 thorax minutely granular, not shining ; tegular punctured, green 

 with sometimes a purple spot; wings smoky ; nervures black; first 

 recurrent nervure joining second submarginal cell a little less than 

 one-third from its base, second joining it a little less than one-fourth 

 from the apex ; legs green, tarsi black, hind tarsi sometimes sub- 

 metallic on basal joint; dorsal surface of abdomen almost nude, the 

 sparse short pubescence mixed black and pale; ventral scopa wholly 

 black. 



$ . Length 5? to 8 mm., bright bottle-green, that is, a much yel- 

 lower green than the 9 • Pubescence of head and thorax more 

 copious, nowhere mixed with black ; creamy white on clypeus, 

 cheeks beneath, femora and lower part of thorax, pale ochreous on 

 vertex and dorsum of thorax, especially scutellum ; wings a little 

 clearer ; tarsi more distinctly metallic ; the scanty pubescence of 

 abdomen all light ; sixth dorsal segment barely notched, seventh 

 strongly emarginate ; seventh ventral segment greenish-blue, large, 

 its hind margin rounded, with pale pubescence. 



Hab. — Olympia and Seattle, Wash. (T. Kincaid). The speci- 

 mens can be separated into two general series, one larger, the other 

 smaller and with more globose abdomen. After careful study, I 

 fail to find specific characters separating these, but if it should be 

 subsequently held that they are different, the type is to be consid- 

 ered the larger form. The females are, with one exception, of the 

 larger size ; the males are, with three exceptions, of the smaller ; 

 both forms were taken at the same time and locality. 



The exact data are as follows : 



Seattle: 1 9 May 14, 1897, on Rub us ursimis ; 1 $ April 14, 

 1897, on sand bank ; 1 $ April 18, 1897. 



Olympia : 6 9 , 3 June 1st, one June 2d, one June 21st, one July 

 1st. 13 $ , one May 11th, two May 5th, one May 23rd, three May 

 25th, one May 28th, one June 13th, two April 25th, on Fragaria; 

 two April 22d, on Taraxacum. 



