THE PYTHID BARK BEETLES. TW) 



ing the thorax narrowed behind, rarely margined at the sides, its 

 disk without basal impressions. In form they are usually long and 

 narrow, either slightly convex or much flattened. They occur be- 

 neath bark, usually that of pine, and have no special economic im- 

 portance. 



Other than the characters above mentioned, the Pythidre have 

 the he:id prominent, not constricted behind the eyes, which are 

 neither emarginate or finely granulate; antenna 1 11 -jointed, slightly 

 thickened toward the tips ; elytra rounded at apex, covering the ab- 

 domen, the latter with five free ventral segments ; front coxa; coni- 

 cal, usually contiguous, the cavities open behind; tarsi slender, 

 never lobed, their claws simple. 



Of the nine genera recognized by LeConte and Horn, representa- 

 tives of but three have been taken in the State, while those of one 

 other probably occur. The only papers treating of any of the 

 North American species are as follows : 



Horn. "Table of the species of Cononotus, " in Trans. Amer. 

 Ent. Soc., II, 1868, 136. 



LeCo-ntc. 1 Table of Rhinosimus," in N. Am. Entom., I, 1868, 4. 



Horn. "Synopsis of the Genus Piillio," in Trans. Amer. Ent. 

 Soc., XV, 1888, 45-46. 



Wicl-lifun. "The Pythida- of Ontario and Quebec," in. Can. 

 Ent, XXXI, 1899, 57-61. 



KEY TO INDIANA GENEKA OF 1'YTHID.K. 



(i. Middle coxa? with distinct trochaniins ; last join! <n" maxillary palpi di- 

 lated; mandibles visible beyond the labrnm ; length 10 or more mm. 

 l>. Third joint of antennae not longer than fourth; rlylra not striate. 



I. BOROS. 



lil>. Third joint of antenna' longer (ban fourth ; elytra striate; body much 



depressed. PYTHO. 



ita. Middle coxa 1 enclosed by the sterna, without trochantins ; last joint of 



maxillary palpi not dilated ; mandibles not visible beyond the labrum : 



length less than 5 mm. 



c. Beak of head broad and very short. II. SAIJMNGVS. 



cc. Beak prolonged. III. RHINOSIMIS. 



I. BOROS Herbst. 1707. (Or., "to shine.") 

 But one species from North America belongs to this genus. 



1M-10 (770S). BOROS I NICOI,OR Say, Jonrn. Phil. Acad. Nat. SH.. V. isir,. 

 238; ibid. II, 305. 



Elongate, slender, subdepressed. Uniform pic-eons, shining, scarcely or 

 not. at all pubescent. Antenna' one-third longer than head. Thorax oval, 



