AMERICAN COLEOPTERA. 297 



Thorax oblong, slightly longer than wide, sides broadly arcuate in 

 front ; joints 4-6 of % antennae enlarged. 7 scarcely different from 

 8: sixth ventral of % broadly, moderately, deeply emarginate, the 

 lateral lobes rounded and not produced ; pygidium acutely oval at 

 tip; color black. Length 15-20 mm. /faft.— Southern Arizona, 



Lower California (San Jose del Cabo) nielieiia. 



Pygidium of % broadly rounded or truncate at apex. 

 Hind trochanters of % with an acute spine. 



Fifth abdominal segment of % emarginate from side to side, lateral lobes 

 prominent; color green, head and thorax brilliant aeneous, elytra 

 usually with strong cupreous or violaceous metallic lustre. Length 

 16-28 mm. Hab.—"Mmn. ; " Mont, Wyo., Colo., Kans. 



nutlalli. 



Fifth abdominal segment of % acutely notched at middle, lateral lobes 



broadly rounded ; head and thorax green, elytra bluish or violet, 



rarely green. Length 13-18 ram. Hab.~M.ctnt. and Wyo. to 



Wash., Oreg. and Cal «yaiiipeiinis. 



Hind trochanters of % without spine. 

 Body above glabrous or nearly so. 



Antennal joints 4-7 {%) with short erect haijs on the anterior face; 

 color green, elytra varying to violet. Length 15-18 mm. H/th.— 



Kansas, Colorado viridaiia 



Antenual joints 4-7 ( ^ ) pilose on their posterior face ; color black 

 throughout. Length 15-20 mm. /Taft.— California (San Diego 



and vicinity) tenebrosa. 



Antennal joints of ^ not pilose. 



Thorax as wide as long, pentagonal, sides obtusely angulate; joints 4- 



• 7 of ^ antenna much enlarged, 5 and 6 largest; fifth ventral of 



% not emarginate, sixth deeply and broadly impresso-emarginate. 



the lateral lobes prominent. Length 15-18 mm. i/rt6.— Nevada 



and desert regions of Eastern California lilkei. 



Thorax longer than wide, sides broadly arcuate, not in the least an- 

 gulate. 

 Joints 3-5 of % antennae most evidently dilated ; fifth ventral of % 

 deeply emarginate; black, thorax rarely in part rufous. Length 

 13-18 mm. ifaJ.— California (Los Angeles Co. to Mendocino Co.), 



Lower California childii 



Joints 4-6 of % antennae most enlarged ; fifth ventral of ^ not per- 

 ceptibly emarginate; black throughout. Length 13-18 mm. 

 flaft.— California fLake, Sacramento and Tulare Counties). 



funerea. 



Body above conspicuously pubescent. 



Body above black, thorax coarsely punctate. Length 13 mm. Hub.— 

 Colorado, Arizona puberiila 



Body above in great part yellow; thorax nearly smooth, base emargin- 

 ate at middle. Length 7.5-15 mm. ifrti.— Montana to New Mexico 

 and Arizona bigiitlata. 



TRANS. AM. KNT. SOC, XXVII. (38) AUG. 1901. 



