80 GEO. H. HORN, M. D. 



From the species with which this one might be confouuded, it 

 differs by the quite smooth thorax, pale elytral margin, the acute 

 sutural angles, and finally, by the completely separated middle coxse. 



Much European bibliography and synonymy has been omitted, 

 only that pertinent to our fauna being given. 



Occurs abundantly throughout northern Europe and in the 

 northern regions of our continent in Canada and the Hudson's Bay 

 region. A specimen has been received from Mr. Wickham, collected 

 at Luling, Texas. Received also from Oregon and Owen's Valley, 

 California. 



G. tuberculata Say, Jouni. Acad, iii, p. 256: edit. Lee. ii, p. 220: puncti- 

 pennis Mann., Bull. Mosc. 1843, p. 308. — Oblong oval, scarcely wider behind, 

 subdepressed, opaqne, finely pubescent, color variable from dull yellow to pice- 

 ous. Antennje entirely black. Head coarsely and closely punctate, occiput 

 black, front and clypeus yellow. Thorax yellow, with three piceous spots, the 

 central one larger and triangular, nearly twice as wide as long, somewhat nar- 

 rowed in front, sides rounded or obtusely subangulate, hind angles distinct, base 

 on each side oblique, surface somewhat shining, coarsely and closely punctured, 

 smoother near the front angles and along the apex ; elytra somewhat wider 

 behind the middle, humeri distinct, but obtuse, sutural angle well defined, sur- 

 face coarsely and deeply punctured, closely around the scutellum, much more 

 finely and sparsely at sides and apex. Body beneath piceous, finely pubescent. 

 Legs either entirely pale or piceous. Length .20 — .24 inch. ; 5 — 6 mm. 



3Iale. — Last ventral broadly emarginate at middle, the disc with a deep semi- 

 oval depression with sharply-limited edges; claws finely bifid at tip. 



Female. — Last ventral with a very small notch at middle of apex ; claws more 

 widely bifid. 



The middle coxje are absolutely contiguous. 

 Two varieties of this species occur : 



G. tuberculata Say. — Color dull yellow or reddish brown, the underside 

 usually piceous : legs pale. 

 G. punctipennis Mann. — Piceous, the front and thorax yellowish. 



Occurs in the Middle States (Lee), Colorado, Idaho, Washington, 

 California, Oregon and Vancouver. 



G. decora Say, Long's Second Exped. ii, p. 294; ed. Lee. i, p. 195; f salicis 

 Eand., Bost. Journ. ii, 1838, p. 31; var. carho Lee, Proc. Acad. 1861, p. 358. — 

 Form oblong, scarcely wider behind, not very convex, color dull yellow, brown 

 or entirely black, surface with fine, short, silken pubescence. Antennae entirely 

 piceous, or with the proximal ends of the four or five basal joints pale. Head 

 densely punctured, opaque, a finely impressed median line. Thorax twice as 

 wide as long, narrower in front, sides arcuate, hind angles slightly prominent, 

 base oblique each side, disc moderately convex, with a vague median depression 

 and a shallow fovea each side, surface densely punctate and opaque, the three 

 spots usually indistinct; elytra scarcely widened behind, humeri distinct, margin 



