288 MEMOIRS ON THE COLEOPTERA 



unusually large, fully two-fifths as wide as the prothorax, the ridge 

 inclined upward, truncate, not apically dilated, the clypeal process 

 long and gradually expanded to the sinuato-truncate apex; prothorax 

 rather small, three-fourths as wide as the elytra, opaque and im- 

 punctate; epimera with the inner part reflexed and violaceous; elytra 

 two-fifths longer than wide, feebly cuneiform, rapidly arcuato- 

 truncate at apex, without trace of punctulation, the basal margin 

 partially polished; pygidium with coarse and close-set, anastomosing 

 transverse strigilation, evenly dense throughout, the hairs extremely 

 minute and scarcely discoverable; metasternal punctures deep but 

 arcuate and linear. Male with the abdomen feebly impressed along 

 the middle, the anterior tibiae not very slender, with two feeble but 

 sharp external teeth, the apical process well developed, obliquely 

 acute; hind tarsi unusually long, thick and compressed, distinctly 

 longer than the tibiae. Length (cf ) 21.0 mm.; width 11.7-12.0 mm. 



Texas (Alpine) and Arizona, Wickham abdominalis n. sp. 



A Nearly similar (cf ) but shorter, the upper surface nearly similar 

 throughout, the head not so large, of the usual size, the ridge 

 similar, the clypeal horn long, more slender and parallel; prothorax 

 relatively larger, fully four-fifths as wide as the elytra, which are 

 not a fourth longer than wide, only feebly tapering and still more 

 broadly subtruncate at apex, the two raised lines feeble; pygidium 

 not or barely at all testaceous, but otherwise similar; the aeneous- 

 green lustre denser but bright and polished, the hairs much more 

 distinct basally; anterior tibiae with the middle tooth relatively 

 more developed; hind tarsi more slender, not longer than the 

 tibiae. Length (cf) 17.8-21.0 mm.; width 10.0-12.5 mm. Mexico 

 (Saltillo in Coahuila, near Chihuahua City and in Durango), 

 Wickham. The abdomen is more nearly solidly metallic but is 



generally testaceous along the middle *discolor n. subsp. 



Under surface deep and uniform polished green, throughout, the upper 

 surface as in the preceding, the pygidium not or scarcely testaceous 

 under the strong metallic green glaze of the surface, differing from 

 abdominalis in having the sparse hairs much longer, very coarse, 

 pale and conspicuous; clypeal process high, large, truncate and 

 usually parallel. Length (9 ) 24.0-27.0 mm.; width 15.0-15.5 mm. 

 Mexico (Durango and elsewhere). [C. malina Jans.] . *obliqua Burm. 

 A Nearly similar but smaller, stout, similar in coloration above, 

 except that the pronotum is more broadly tawny at the sides; 

 head more than a third as wide as the prothorax, which is relatively 

 smaller than in obliqua and barely three-fourths as wide as the 

 elytra; clypeal process broken in the type but narrow and ap- 

 parently long and parallel; prothorax more strongly and sharply 

 angulate at the sides medially than in obliqua; elytra similar but 

 rather more depressed and less broadly truncate at apex; pygidium 

 imperfectly testaceous, with strong metallic green lustre, the hairs 

 similarly rather long, coarse and pallidly glistening; under surface 

 and legs throughout polished and dark green, without trace of 

 aeneous lustre; arcuate metasternal punctures coarse and deep, 

 the hairs finer and less conspicuous than in obliqua; anterior tibiae 



