164 [SEPTEMBER, 
2. C. marginicollis, niger, cinereo-pubescens, supra nigro-pilosellus, 
capite vix punctulato, thorace levi transverso, rufo-marginato, elytris cyaneis, 
confertissime subtiliter punctatis, abdomine sanguineo. Long. -2. 
San Diego, California; one female, with the antenne piceous, except the 
three basal joints, which are rufous. The thorax is more transverse and less 
rounded on the sides than the next species, and the discoidal black spot is so 
large as to leave only a narrow red margin. 
3. C. nigriceps ‘Er. Entom. 56; Malachius nigriceps Say, Journ. Ac. 
3, 183; Am. Ent. 3, pl. 48. 
Middle and Southern States. 
4. C. eximius Er Entom. 56. 
New York. Very similar to the preceding, but the anterior femora are yel- 
low, and the abdomen sanguineous, without black spots. 
5. C. tricolor Er. Entom. 57; Malachius tricolor Say, Journ. Ac- 3, 182; 
Am. Ent. 3, pl. 48. 
New York and Lake Superior; a variety with the lateral margin of the elytra 
more distinctly rufous, is found in Missouri Territory. 
6. C. punctatus, niger subtiliter cinereo-pubescens, supra dense nigro- 
pilosellus, capite confertim subtiliter punctato, thorace levi rufo, transverso, 
lateribus et bast valde rotundatis, elytris alutaceis, confertim punctatis. 
Long. °17. | 
Two females from Missouri Territory; the antenne are black, with the 
two basal joints rufous; the body beneath is black, with the coxe inclining to 
rufous. 
7. C. cribrosus, #neo-niger, cinereo-pubescens, supra nigro-pilosellus, 
thorace levi, rufo, transverso, lateribus valde rotundato, macula magna discoi- 
dali nigro notato, elytris convexis viridibus grosse punctatis, pedibus anticis 
testaceis. Long. °15—-17. 
San Diego, California, under sea weed. The male has the antennz entirely 
rufous ; in the female the external joints are piceous, with their outer angles 
rufous. 
8. C. quadrimaculatus Er. Entom. 58. Malachius 4-maeulatus Fabr. 
Syst. El. 1, 308. 
Common in the Middle and Southern States, 
9. C. confluens, niger, cinereo-pubescens, supra nigro-pilosellus, capite 
subtilissime punctulato, thorace rufo transversa, ad latera punctulato, elytris 
confertissime punctatis rufis macula basali alteraque majore postica fere con- 
fluente viridibus, abdomine sanguineo. Lang. +17. 
Missouri Territory, two females; the antennx#.are piceous, with the four 
basal joints pale; the spots on the elytra are so large as to leave only the suture 
and margin red; the red is wider at the middle, both on the suture and margin, 
while in the next species, the external margin alone is dilated. From both C. 
4-maculatus and C. vittatus it is easily distinguished by the finely punctured 
sides of the thorax. 
10. C. vittatus Er. Entom. 60; Malachius vittatus Say, Journ. Ac. 3, 
181; Am. Ent. 3, pl.48. (% ) Megadeuterus Hawortht Westwood, Tr. Ent. 
Soc. London 2, 98, pl. 10, 9. 
Middle States, rare. 
11. C. marginellus, niger, densius cinereo-pubescens, supra nigro- 
pilosellus, capite thoraceque subtiliter punctulatis, hoe tenuiter rufo marginato, 
transverso, elytris cyaneis confertim punctatis margine ad medium latiore sutu- 
raque rufis, abdomine pedibusque rufis. Long. +17. 
River Colorado, California; the red margin of the elytra is dilated as in C. 
vittatus.. The antennz of the male are entirely rufous, those of the female are 
piceous, with three or four basal joints rufous. 
