H. C. FALL. 143 



Hab. — New Hampshire (^Nlts. Washington and Monadnock, 

 Bhinchard), Massachusetts, District of Colunihia, Maryland, Michi- 

 gan (Marquette), Colorado, Montana, California (Siskiyon Co.). 



A common and unusually widely distributed species, though 

 apparently confined to the more northern regions. As might be 

 expected there is a considerable degree of variation noticeable. The 

 beak in the female varies much in length ; the first antennal joint, 

 while relatively longer in the female, varies somewhat in both sexes. 

 In the examples from District of Columbia and Maryland the pro- 

 thorax is more transverse and the punctuation closer, both above 

 and below. The pubescence in these latter examples is sometimes 

 more yellowish. 



The specimens taken by Mr. Blanchard on Mt. Washington and 

 Mt. Monadnock are decidedly larger than those seen from elsewhere, 

 but there are no other apparent differences. I have followed Smith 

 in his interpretation of Walsh's lanuginosum (which name was pre- 

 occupied), but the identification seems to me by no means certain. 

 Walsh described his species as taken from galls made by a Cecidomya 

 on Sali.v strobiloides. In New England both INIr. Blanchard and 

 myself have taken it abundantly from April to August on white 

 birch (Betuki alba). 



Abraded males from Colorado served as types for vicinum Smith. 



51. A., abdominale Smith. — Eobust, black; pubescence fine, not very 

 conspicuous. Beak ( % ) strong, subequal to the head and prothorax, njoderately 

 dilated, scarcely attenuate toward the tip, somevyhat shining, fine sculpture 

 extending nearly to the apex, moderately strongly punctate at the sides, more 

 finely above, a conspicuous puncture at the point of dilatation, and a short supra- 

 antennal groove. Antennje strong, first joint scarcely as long as the next two, 

 second reaching the eye. Front wide, with a shallow median sulcus, on either 

 side of which is a line of confluent punctures ; eyes not very prominent. Pro- 

 thorax a little wider than long; base not very much wider than the apex; sides 

 diverging from the apical constriction to the middle, thence subparallel to the 

 base; posterior sin uation scarcely evident ; surface moderately, closely, strongly 

 punctate; basal fovea extending in front of the middle. Elytra ventricose, 

 more than twice as wide as the prothorax, ovate; humeri small; sides arcuate 

 widest behind the middle; intervals not much wider than the striae, fiat or 

 nearly so. Metasternum very little louger than the first ventral ; punctuation 

 rather coarse but not dense. Length 2.4 mm. ; .095 inch. (PI. IV, fig. 13). 



% . Sutural angles rounded ; middle and hind tibiae armed with a rather short 

 mucro which is iuferiorly subaugulate. 



9 • Not seen. * 



* Since writing the above I have seen a 9 •" th^ LeConte collection. It difl"ers 

 from the 'J, in the smoother, slightly longer beak, which is noticeably dilated at 

 the insertion of the antennae. 



TRANS. AM. ENT. SOC. XXV. OCTOBER, 1898. 



