COLEOPTERA. CHILOGNATHOMORPIIA. 177 



to obtain the gummy secretion is described, as well as the more curious 

 fact, that the ants, in return, feed the Clavigers from their own moutlis. 

 Muller also described and figured the exuvia of the pupa of the Cla- 

 vigor, and which is of an oval shape i^fig- 17.8.), with the posterior 

 extremity truncate, and furnished with two small lateral appendages, 

 as well as with two or three frontal clavate appendages, being supposed 

 to be the sheaths of the antennae. At the posterior part of the body, 

 which appears to be multi-articulate, are the exuviae of two articulated 

 legs on each side. An elaborate memoir upon this genus, with highly 

 magnified figures^ has been published by Schmidt. The genus Ba- 

 trisus appear also to be attached to ants' nests. (See Chevrolat, in 

 Silh. Rev. Ent. No. 17.) Dalman has described a genus, Articerus, 

 observed in gum copal (or anime ?) ; in which the antenna? consist of 

 a long and single cylindric joint, and the eyes are wanting, and has 

 proposed to form this genus and Claviger into a separate family 

 (^Siced. Trcms. for 1825, pi. 5. f, 12.). M. Aubehas also communicated 

 to me a notice of a genus closely allied to Articerus, but possessing 

 eyes,* 



The second general division of the Pentamerous Coleoptera Is one 

 which In the present state of the science can but be provisionally adopted, 

 and which, according to the views of MacLeay, comprises those species 

 whose larvffi resemble the lulidte in having a long and almost cylindrical 

 body, the posterior extremity of which is curved beneath the breast, 

 so that the larva when at rest lies upon its side. From thus Imitating 

 the Chilognatha, Mr. MacLeay has given to tliis group or stirps the 

 name of Chilognathomorpha, citing the larvai of Scaraba;us and 

 Lucanus as examples. Like the Chilopodomorpha, those beetles, 

 which have chilognathiform larva; are generally pentamerous. " The 

 Wire-worm, or larva of Elater segetis," according to Mr. Kirby, " as to 

 shape, best resembles the full-grown lulus and those of the Petalocera 

 the young one ;" whilst Mr. ^MacLeay states that "the tendency of 

 Chilognathiform larva; is herbivorous, having among them Lucanus, 

 Ptinus, Byrrhus, Hister, Elater, Buprestis, and part of Tencbrlo and 

 Dermestes:" the passage from the Chilognathiform to the Vermiform 

 groups being supposed to be effected by means of the genus Bostri- 

 chus. Mr. MacLeay did not, however, venture to designate the 



* Nordinann's work on the Brachulytra, containing many new, cliiefly exotic, 

 species, has just arrived in this country. 



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