NORTH AMKRIUAN COLEOPTERA. 103 



curved tibiae near the knee. There will, however, be found in the 

 annexed table two species with curved hind tibise in the male which 

 are certainly not separable from Scelida, while Crotch's type differs 

 from those in the single sexual character of a tooth on the curved 

 tibiffi. While the description of Scelolypems is rather naeagre, the 

 presence of the type makes it necessary to suppress Scelida. 



All our species belong to the Pacific faunal region and occur in 

 Oregon, California and Arizona, one species extending to Montana 

 and Colorado. They may be sei)arated as follows : 



Thorax always eutirely yellow. 



Head and femora yellow ." • flaviceps. 



Head metallic green. 



Elytra finely sparsely punctate, smoother at apex, posterior tibije %, strnight 



and not toothed flavioollis. 



Elytra coarsely sparsely punctate; posterior tibiae % stout, arcuate and 



toothed at base tejoiiicus. 



Elytra sparsely punctate and alutaceous; posterior tibiae % strongly curved, 



not toothed loripes. 



Thorax either maculate or blue, varying to black. 



Thorax yellowish, with a median and lateral spot piceous....llls»CuJicollis. 

 Thorax uniformly blue or black. 

 Elytra evidently punctate. 

 Thorax polished, impunctate, black, slightly narrowed to base. 



maeulicollis var. 

 Thorax spai-sely punctate. 



Antennae and legs black ; posterior tibiae of male straight. 



graptoderoides. 

 Antennae at base, anterior femora and tibiae in part yellow ; posterior 



tibiae % curved Schwarzi. 



Elytra alutaceous, not punctate. 



Antennae filiform, last joint scarcely longer than the preceding. 



loiigiilus. 



Antennae broader externally, the outer joints flattened and slightly 



concave beneath in % , last joint notably longer decipieiis. 



S. flaviceps u. sp. — Similar in form to flavicollis, but a little more robust; 

 head, thorax, metasternum and femora yellow, elytra metallic-green or blue in 

 certain lights. Antennae two-thirds the length of body, piceous, the underside 

 of the three basal joints pale. Head smooth, yellow. Thorax broader than 

 long, slightly narrower at apex than at base, sides slightly arcuate in front, par- 

 allel posteriorly, disc moderately convex, smooth and impunctate; scutellum 

 yellow. Elytra with slightly arcuate sides, surface rather polished, sparsely 

 finely punctate; metasternum and abdomen piceous, with bluish lustre; femora 

 reddish yellow, tipped with piceous at the knees, the tibiae and tarsi black. 

 Length .26 inch.; 6.5 mm. 



Two female specimens have been examined, their ventral charac- 

 ters the same as in flavicollis. 



TEANS. AM. ENT. SOC. XX. JUNE. 1893. 



