52 MATERIALS TOWARDS A HISTORY 



162. M. PULCHER. 



Ochraceous with a dense covering of short hair; basal articulations of the antennae, base of the elytra, and a 

 wide, transverse band behind the middle, brown. 10'" long; 3 wide. Inhabits Pennsylvania. 



Lamia pulchra, Mels. Catalogue, No. 753. Monohammus carpentarius, Dej. Cat., p. 367. 



Frontal line impressed, entire; region of the mouth testaceous; mandibles and eyes black; disk of the Iabrum 

 blackish; antenna? ochraceous, invested with fine hair, and having a row of scattered hairs beneath; scapus brown, 

 with scattered hairs, remaining articulations with the tips, slightly brown; prothorax sub-equal: scutel conspicuous, 

 its colour being paler than that of the elytra: elytra truncate at tip, shagrined at base, which is brown, gradually 

 passing into ochraceous at the posterior margin; another band commences behind the middle in an irregular but 

 definite line, and passes into the ochraceous of the apex: inferior parts concolorous: ground testaceous. 



This handsome insect is rare in collections. I have seen it only in Dr. Melsheimer's, 

 and in that of the Academy of Natural Sciences. 



'• LAMIA, Fabr." 



The Reverend F. W. Hope (Charlesworth's Mag., N. H., iii. 251,) has restricted this 

 generic name to a group named Batocera, by Count Dejean, none of the members of 

 which have been found here. It is quoted in this place merely as a depository for such 

 species as cannot be referred to their proper station without an examination of the 

 individuals themselves. 



L. bifidator, Fabr., ii. 286. " Thorace spinoso tuberculatoque cinereo, margine lineolisque atris, elytris cine- 

 reis, maculis oblongis atris." Astynomus nodosus, F. ? 



L. mixta, Fabr., ii. 290. " Thorace spinoso, cinereo fuscoque variegata, antennis longis." Ent. Syst. 

 Supp., 144, 46. 



L. obscura, Fabr., ii. 294. "Thorace spinoso, fusca, elytris striatis, apice pallidis, antennis longis." 



PLECTRODERA, Dejean. 



164. P. scalator, Fabr., ii. 295. Oliv., pi. 67, hg. 172. 



" Thorace acute spinoso, atra, elytris strigis numerosis intcrruptis albis, antennis mediocribus," — belli, Le Conte. 

 (Lamia.) 



Mr. Le Conte's specimen was taken near the Rocky mountains. 



ONCIDERES, Sen. 



165. O. cingulatus, Say. Journ. Acad. Nat. Sci., v. 272. Knoch, in Mels. Cat., 775. 

 O. rubiginosus? Dej. 



The sexes differ only in the greater length of the antenna; in the male. The scutel is 

 sometimes fulvous. A specimen in Mr. Le Conte's collection, named O. rubiginosus, Dej., 

 has the fulvous spots a little larger than they usually are, and the pronotum is whitish. 



Appears in Pennsylvania during the last two Weeks in August, and first week in Sep- 

 tember, upon Carya alba, feeding upon the bark of the small branches. The ova are a 

 line long and half a line in diameter, and are deposited in excavations made for the pur- 

 pose in the small branches of the tree just mentioned. The female then proceeds to 

 gnaw a groove of a line in width, and nearly as much in depth, around the limb, which, 

 in a short time, dies, and the larva feeds upon the dead wood. The diameter of the 

 branches thus cut is from three to five lines, and it sometimes happens that the upright 



