178 GEO. H. HORN, M. D. 



females of several species can only be distinguished by considerable 

 experience. 



The further distribution of the species is as follows : 



Anterior tarsi of male with the first three joints papillose beneath, the fourth 



■ also with a few papillse A. 



Anterior tarsi of male with the first three joints papillose beneath, the fourth 



without papillse B. 



Anterior tarsi of male with the first two joints only papillose C. 



A. 



Under this head we have species remarkable by their much less 

 convexity, the rather deep longitudinal impressions in the thoracic 

 angle which extend considerably forward, the smaller number of 

 elytral striae which do not exceed fourteen, by the marginal series of 

 punctures being larger than those of the striae, and finally by the 

 color of the elytra departing from the normal black becoming slightly 

 bluish, cupreous or violet. 



Three species belong here distinguished as follows : 



Thorax much wider than long, strongly constricted posteriorly, disc of elytra 



not much convex cordittus. 



Thorax cordate, not wider than long, elytra with convex disc. 



Sides of tborax posteriorly oblique with scarcely a trace of sinuation, elytra 



cupreous with greenish or golden margin marginatum. 



Sides of thorax distinctly sinuate, hind angles rectangular, elytra slightly 

 purplish dissolutus. 



C COrdatus Lee, Trans. Am. Philos. Soc. 1853, p. 399. — Black with slight 

 tinge of purplish, moderately elongate, subdepressed. Head moderately elon- 

 gate, smooth, shining, genje very slightly incised. Thorax transversely cordate, 

 broader than long, sides strongly arcuate, posteriorly deeply sinuate, hind angles 

 subrectaugular, disc nearly flat, basal transverse impression deep, longitudinal 

 impressions deep near the base, gradually feebler in front, anterior and median 

 impressions feeble, surface smooth, shining. Elytra elongate oval, more attenu- 

 ate toward the tip, disc subdepressed, margin narrowly reflexed, surface striate, 

 striae with deep coarse punctures which are often confluent and invade the 

 intervals, inflexed portion of the elytra very obsoletely punctate. Body be- 

 neath smooth and shining. Length .48 — .56 inch; 12 — 14 mm. 



This species has at a glance much the appearance of a Nebria. 

 As in the other species of this group the lateral strias of the elytra 

 are not confused. 



Occurs near San Mateo, California; rather rare. 



C marginatum Fisch., Ent. Russ. i, p. 79, pi. 7, fig. 1; Dej. Spec, ii, p. 12; 

 Esch. Mem. Mosc. 1823, vi, p. 98; Mann. Bull. Mosc. 1843, p. 185.— Moderately 

 elongate, black, elytra cupreous with greenish-golden margin. Head moder- 

 ately elongate, smooth shining, gense distinctly incised. Thorax cordate, 

 scarcely wider than long, sides in front arcuate, posteriorly oblique very feebly 



