1854.] 37 



striis tenuibus profundi?, punctis tribus impressis, antennis palpis pedibusque tes- 

 taceis. Long. -31 -35. 



Lake Superior ; abundant. Very similar to the preceding, but a little nar- 

 rower in its form, and with the lateral margin of the thorax not distinctly wider 

 towards the posterior angles, and less reflexed. 



3. C. o p a c u 1 u s, longiusculus, piceus, thorace latitudine non longiore, 

 antice subangustato, lateribus testaceis iatius subdepressis, non reflexis, basi 

 utrinque paulo impresso, elytris fere opacis, striis tenuibus hand profundis, 

 punctis tribus impressis, antennis palpis pedibusque testaceis. Long. 35 42. 



Middle, Southern and Western States; rare. This species, with the form of 

 C. gregarius, has the dull elytra and finely impressed strias of C. ruficollis ; it 

 seems also sufficiently distinct from the preceding species, by the sides of the 

 thorax being' depressed, broader behind and not reflexed. 



4. C. qu a d r i c o 1 1 i s, longiusculus, piceus, apterus, thorace latitudine 

 non breviore, antice vix angustato utrinque subimpresso, elytris fere opacis, striis 

 tenuibus non profundis, punctis 3 vel 4 impressis, antennis palpis pedibusque 

 testaceis. Long. '27 *4. 



San Francisco, California. This species is narrower than C. ruficollis, and is 

 readily distinguished by the form of the thorax; the thorax and head have a 

 reddish tinge, but do not appear ever to reach the deep, dull rufous color observed 

 in C. ruficollis. 



5. C. ruficollis, latiusculus, piceus, apterus, capite thoraceque piceo-rufis, 

 hoc latitudine breviore, antice angustato, lateribus (prsesertim antice) rotundatis, 

 margine minus distincte depresso subrefiexo, basi utrinque subimpresso, elytris 

 fere opacis striis tenuibus, punctis 3 impressis, antennis palpis pedibusque rufo- 

 testaceis. Long. -35 -4. 



Dej. Sp. Gen. 3, 78 ; Mann. Bull. Mosc. 1843, 195. 



San Francisco and San Diego. Considerably wider than any of the preceding 

 species, and with the sides of the thorax anteriorly more rounded ; the sides con- 

 verge a little near the base, whereby the posterior angles are rendered less rec- 

 tangular than in those above described. This species and the preceding, fre- 

 quently subject travellers to great annoyance by crawling over their bodies at 

 night, when sleeping on the ground ; the multitudes which are seen in March 

 and April, under every object capable of affording them shelter, are worthy of 

 admiration. 



6. C. ob s c u r u s, minus elongatus, piceus, apterus, thorace latitudine non 

 breviore, antrorsum angustato, lateribus rotundatis (angulis basalibus obtusiori- 

 bus) margine depresso subrefiexo, basi utrinque subimpresso, elytris fere opacis, 

 striis tenuibus non profundis, punctis tribus impressis, antennis palpis pedi- 

 busque iufo-testaceis. Long. *4. 



One female found in the Southern part of California. This species differs from 

 C. ruficollis and C. quadricollis by the form of the thorax, which is not wider 

 than long, considerably narrowed in front and moderately rounded on the sides, 

 which are distinctly depressed even to the base, and hardly reflexed. The elytra 

 are more distinctly wider than the thorax, but otherwise are formed and sculp- 

 tured as in C ruficollis. 



Pristodactyla Dej. 



1. P. i mp u n c t a t a, nigra, nitida, thorace leviter obovato, latitudine non 

 breviore, angulis posticis rotundatis, lateribus margine anguste reflexo, basi 

 utrinque late foveato, elytris thorace latioribus, pone medium paulo dilatatis, 

 striis profundis, bipunctatis, antennis palpis pedibusque rufis, unguihus valde 

 serratis. Long. -35 *42. 



Lee. Ann. Lye. 4, 2 ] 7 . ; 



Feronia impunctata Say, Trans. Am. Phil. Soc. 2, 45. 



Pristodactyla americaiia Dej. Sp. Gen. 3, 83. 



Middle States ; rare. Smaller than the next, and distinguished by the thorax 



