440 REVISION OF THE BLATERIDjE 



16. C. coniungens, niger, parce griseo-pilosus, thorace canaliculate, latitudine longiore, antice 

 angustato, convexiusculo, ante basin paulo latiore, lateribus late rotundatis, sat punctato, lateribus 

 paulo densius, elytris lateribus vix dilatatis, apice vix oblique attenuates, profunde striatis, striia punc- 

 tatis, interstitiis subbiseriatim punctatis, antennis rufo-piceis, pedibus ferrugineis. Long. -42. 



One specimen, California, Mr. J. Child. This species at first seems similar to C. aethi- 

 ops, but the joints of the antennae are not broad and compressed, but are formed as in the 

 preceding species: the third joint is considerably longer than the second, and a little lon- 

 ger than the fourth, so that it cannot be associated in the division with C. rotundicollis and 

 C. sulcicollis, to which it forms a transition by its less dilated elytra. 



17. C. pulclier, crassiusculus, vix tenuissime pubescens, niger, thorace quadrato, convexo, late- 

 ribus antice rotundatis, angulis posticis acutis paulo pvoductis, confertim punctato, sanguineo, vitta 

 dilatata dorsali margine prosternoque nigerrimis, elytris testaceis, sutura, macula elongata humerali, 

 faseiaque pone medium transversa nigris, striis profundis punctulatis, interstitiis parce punctulatis, 

 abdominis lateribus sanguineis. Long. '53. 



One specimen from New Hampshire in Dr. Harris' collection. It closely resembles Ela- 

 ter cruciatus Linn, of Europe, but differs (according to description) by the black feet 

 and antennas. This species might perhaps be more naturally placed in the preceding di- 

 vision near C. hieroglyphicus: the joints of the antennas do not diminish in size after the 

 fourth, as in the preceding species of this division : the fourth is, however, decidedly lon- 

 ger than the fifth. 



A— 2.-6. 



18. C. crassus, obesus, piceo-niger, vix tenuissime pubescens, fronte profunde concava, thorace 

 transverso, inflato, lateribus antice rotundatis, apice fortius transversim impresso, minus dense punc- 

 tato, elytris striis punctatis, interstitiis planis parcius punctatis, pedibus piceis. Long. "55. 



Kentucky, Dr. Harris; Pennsylvania, Dr. Melsheimer. The deep impression along the 

 apical margin of the thorax is dilated at the angle, each side, and is a remarkable charac- 

 ter. It is much more robust and inflated in its form than any other of our species. 



A.— 2.— ? . 



19. C. r o t u n d i c o 1 1 i s, angustatus, niger, glaber, thorace quadrato, latitudine paulo breviore, 

 lateribus rotundato, angulis posticis parvis acutis divaricatis, convexo, parce subtilius punctato, (ssepe 

 sanguineo,) elytris lateribus vix dilatatis, apice rotundatim attenuatis, striis profundis impunctatis, 

 interstitiis vix punctulatis, pedibus nigris, tarsia fere testaceis. Long. "41. 



Elater rotundicollis Say, Ann. Lye. 1, 259, (var. thor. sanguineo.) 



Vermont, Prof. Adams. The black variety is from Pennsylvania, and was given me by 

 Rev. D. Ziegler. The remarkably rounded, quadrate thorax, with small, sharp, diverging 

 angles, will distinguish this from any other native species. It differs from all the preceding 

 by the more parallel elytra, which behind the middle are not obliquely narrowed, but re- 

 gularly rounded. The fourth joint of the antennae, although longer than the following, is 

 not so much so as in the species just described: the antenna' are hardly serrate, so that 

 the fourth and following joints are very little wider than the third. 



