AMERICAN COLEOPTERA. 179 



sinuate, disc nearly flat, subopaque, impressions moderate. Elytra oval scarcely 

 more attenuate posteriorly, margin narrowly reflexed, disc convex, surface 

 striate, striae deep and with coarse punctures, intervals convex and often inter- 

 rupted so as to become subgranular on the declivity. Body beneath smooth 

 shining. Length .50 — .64 inch; 12 — 16 mm. 



var. Fulleri. — Under this head I place certain specimens from Oregon, of 

 larger size and rather more robust form than the above, in which the surface 

 is black with very slight purplish tinge, the margin of the elytra being merely 

 slightly more purple. The sides of the thorax are scarcely sinuate and re- 

 semble the normal form above described, otherwise I would have considered 

 the specimens to be rfisso^M^its. Length .60 — .64 inch; 15 — 16 mm. 



This species is very common in Alaska and to the southward, 

 variety Fulleri occurs in Oregon. 



C dissoliittis Schaum, Berlin Zeitschr. 1863, p. 72, pi. 3, fig. 6.— Form 

 moderately elongate, black with slight tinge of blue. Head moderately elon- 

 gate, shining, slightly transversely wrinkled and behind the eyes a faint trace 

 of constriction, gense rather deeply triangularly incised. Thorax cordate as 

 long as wide, sides in front arcuate, posteriorly moderately sinuate hind angles 

 rectangular, basal transverse impression deep, the others moderate, surface 

 nearly flat very feebly shining. Elytra oval slightly attenuated at tip, disc 

 convex, surface deeply striate, striee punctured, intervals convex often inter- 

 rupted near the sides and declivity, inflexed portion obsoletely punctate. Body 

 beneath smooth shining. Length .64 inch; 16 mm. 



This species differs from the preceding species principally in the 

 sinuate sides of the thorax and the more deeply incised genje. In 

 general appearance it resembles the variety Fulleri above noted. The 

 interruption of the intervals near the tip in some specimens causes a 

 granulated or tuberculate appearance, as is the case in Schaum's type 

 and another in Leconte's cabinet. 



Occurs in California. 



B. 



The following series contains species with elytra much more convex 

 than in the preceding, the longitudinal impressions of the thorax 

 much feebler. The color is always deep black, moderately shining. 

 The strise are usually very numerous about sixteen or eighteen in 

 number, but it is almost impossible to count their number as those 

 near the margin in several species become confused. In one species 

 {interrii2>tus) , the stride do not exceed fourteen in number and the 

 marginal series of punctures is large as in marginatus, but the tarsi 

 are as in the other species, that is, there are three joints papillose 

 beneath in the anterior pair % , and the fourth joint is glabrous at 

 middle and with merely a few short spinous hairs at the sides. By its 

 sculpture interruptns unites series B and A, in the same manner that 

 minius does B and C. 



