A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 239 



finely dentate on the outer margin. Anterior tibia strongly arcuate, with an 

 indistinct dilation at apex; middle tibia slightly arcuate; posterior tibia straight. 

 Length 13.5 mm., width 5.5 mm. 



Redescribed from a male in the United States National Museum, 

 simply labelled "Arizona." This specimen was compared with a 

 specimen in the Horn collection, which had been compared with the 

 type. 



Female. — Differing from the male in having the basal segments of the antenna 

 bronzy green, the last visible abdominal sternite broadly, transversely sinuate at 

 apex, with a slightly elevated, transversely arcuate, preapical ridge, the anterior 

 tibiae unarmed at apex, and the middle tibia straight. 



Type locality. — Ventanas in Durango (2,000 feet elevation) , Mexico. 

 Type in the British Museum. 



DISTRIBUTION 



From material examined : 

 Arizona : Fort Grant and Fort Yuma. 



Also recorded in the literature from Nogales, Ariz., by Chamberlin 

 (1926) and from Ventanas in Durango, Mexico, by Waterhouse (1887) . 



Host. — Unknown. 



No variation worthy of note has been observed in the few specimens 

 examined. The length is from 12.5 to 14 mm. 



This species resembles atrif asciata LeConte very closely, but in 

 socialis the bluish tinge on the dorsal surface of the body is usually 

 more distinct, the clypeus is deeply, angularly emarginate, with a 

 distinct, acute, med : an notch, the antenna of the male is not bipectinate, 

 and the last visible abdominal sternite of the female has the external 

 angles of the apical emargination more strongly produced, and with 

 a vague preapical ridge. Waterhouse described the species from a 

 single specimen which, according to his drawing, is a male. 



(110) Chrysobothris ltjcana Horn 



(Fig. 104; fig. 126, D) 



Chrysobothris lucana Horn, 1894, Calif. Acad. Sci. Proc. (ser. 2) 4: 328, 367- 

 368; Fall, 1901, Calif. Acad. Sci. Occas. Papers 8: 22, 118; Chamberlin, 

 1926, Cat. Buprestidae North Amer., p. 161; Obenberger, 1934, in Junk 

 (pub.), Coleopt. Cat, pt. 132, p. 639. 



Female. — Rather broadly elongate, moderately convex above, slightly shining, 

 olivaceous green, sides of pronotum and elytra with a bluish tinge, and the latter 

 ornamented with violaceous-black spots; beneath violaceous black, more or less 

 greenish at middle, and more strongly shining than above. 



Head green, slightly bluish behind clypeus, with a vague longitudinal carina 

 on occiput, and an indistinct, transversely arcuate chevron on vertex, in front of 

 which the surface is slightly depressed ; front nearly flat ; surface coarsely, rather 

 densely punctate on vertex and occiput, shallqwly, confluently ocellate-punc- 

 tate behind clypeus, where the surface is clothed with a few short, semierect 

 hairs, intervals densely, finely granulose; clypeus deeply, arcuately emarginate 

 in front, with a narrow median incision, arcuately rounded on each side. An- 

 tenna bronzy brown, more greenish at base, gradually narrowed to apex ; inter- 

 mediate segments not very compact, slightly wider than long, broadly sub- 

 truncate at outer margins; third segment as long as following three segments 

 united. 



Pronotum two-thirds wider than long, slightly narrower at apex than at base ; 

 sides parallel and slightly sinuate at middle, arcuately converging at base and 

 apex; anterior margin slightly emarginate, with a broad, slightly rounded, 



