24 GEO. H. HORN, M. D. 



eighth !^tria form :in interrupted series, leaving quite a h)ng space 

 free in front of the middle of the stria. In addition to the sexual 

 characters common to the group, the males have the middle and 

 posterior tibise slightly arcuate. 



Occurs in Colorado, Utah, Wyoming, Nevada and California. 



A. Jiitei*!^titialiN Dej. — Oval, somewhat oblong, moderately convex, color 

 variable, usually brownish bronze, sometimes bright green, cupreous or nearly 

 black. Antennae usually black, rarely with the first joint pale. Thora.x less 

 than twice as wide at base as long, not much narrowed in front, apex feebly 

 emarginate. sides arcuate, hind angles rectangular, disc convex, with a feeble 

 indication of lateral depression, basal depressions usually distinct, but feeble, the 

 outer oblique, the inner short, linear, surface not punctate. Elytra finely striate, 

 striae very indistinctly punctate, intervals slightly convex, usually with undu- 

 lating surface, the alternate intervals often slightly more elevated, surface very 

 distinctly alutaceous, giving a silken lustre. Body beneath and legs piceous- 

 black, surface smooth. Length .26— .40 inch. ; 6. .5 — 10 mm. 



The scutellar stria is free at its posterior end in the vast majority 

 of specimens, but occasional instances occur with the stria joining 

 the first at the apical end. The ocellate punctures of the eighth 

 stria have :i wide interval between the basal and apical set of punc- 

 tures. In the males the middle tibi?e are slightly bent rather than 

 arcuate, and the posterior tibise are sinuate on the inner edge. 



This species is very variable in form and color. The typical form 

 is probably the dark bronze which occurs from Pennsylvania and 

 New York, westward to Colorado, while the more brilliantly colored 

 forms, the green and brassy, are more abundant about Hudson's 

 Bay and the colder regions to the northward. The darker specimens 

 are of the broader form, the brighter colored specimens being at the 

 same time more elongate. 



After a careful study of the descriptions of pntrneUs Dej. and 

 incequalis Kby., I am convinced that they refer to variations of the 

 present species. The former is mentioned comparatively by Putzeys, 

 but the characters suggested have no specific value whatever. 



Extends from Nova Scotia westward, extending as far south as 

 Pennsylvania in the Atlantic region and northern California on the 

 Pacific. From both these extremes it extends northward to Hud- 

 .son's Bay and to Alaska, crossing Behring Strait to Kamtschatka. 

 Occurs in Europe also. 



A. erratica Sturm. — Elongate oval, feneous, cupreous or uearly black, shin- 

 ing. Antennae piceous-black, the two basal joints often red. Thorax not twice 

 as wide at base as long at middle, sides arcuately narrowing to the front, apex 

 moderately emarginate, hind angles rectangular, but not sharply so, disc moder- 



