164 NORTHERN ZOOLOGY. 



VIII. XYLOPHAGA. 8 Kirb. 



i. Isoceua. 9 Kirb. 



Family CUCUJID^. Cucujidans. 



LXXXV. Genus PYTHO. Lat. 



Latreille, on account of the Heteromerous structure of its tarsi, has placed this 

 genus amongst his Helopians, with which it possesses few other characters in com- 

 mon. Fabricius, with better reason, has placed it next to Cucujus, to which genus 

 he originally regarded it as belonging. With his C. rufus (Catogenus Westwood) 1 

 it agrees, not only in its depressed body, and impressed prothorax, but in its 

 labrum, internally toothed mandibles, bilobed maxillae, with the lower lobe much 

 shorter than the upper, and in its mentum : the palpi are more like those of Cucujus 

 flavipes, as figured by Olivier : the labium, in the specimen I dissected, is a 

 minute, round, corneous piece between the labial palpi ; the tongue is shrunk up, 

 but is evidently membranaceous : the mandibles are incurved at the apex and armed 

 with two sharp teeth, on its inner side are four minute ones, thus approaching the 

 structure of these organs in the Lucanidce. 



(218) I. * Pytho niger. Black Pytho. 



P. (niger) niger nitidus, punctulatus ; antennis tarsique rufis : prothorace cana.licula.to, utrinque longitudinaliler foveato, medio 



latiore, postice constricto : elytris striatis basi punctulatis. 

 Black Pytho, black, glossy, minutely punctured : antennae and tarsi rufous : prothorax channelled, longitudinally impressed 



on each side, widest in the middle, constricted behind ; elytra furrowed, minutely punctured at the base. 



PLATE VII, FIG, 2. 

 Length of the body 5^ — 5J lines. 



Several taken in Lat. 54°. and in the Journey from New York at Cumberland- 

 house. 



8 I would restrict this name to those which have eleven joints in their antennas ; thus excluding the Xylotrypa, which 

 have only ten. 



9 By this term I would characterize these Xylophaga, the terminal joint or joints of whose antenna? do not form a club ; 

 those in which it does I denominate Anisocera. 



1 Zool, Journ. xviii, 221. 



