THE PYTHID BARK BEETLES. I'MY^ 



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 Pythid^e have 

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

 neither emarginate or finely granulate; antennae ll-jointed, slightly 

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

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

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

 never lobed, their claM-s simple. 



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

 tives of hut three have been taken in the State, whih^ 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. Amcr. 

 Ent. Soc, II, 1868, 136. 



LeCooie.— "Table of Khinosimiis," in N. Am. Entom., I, 1868, 4. 



Horn. — "Synopsis of the Uenus Pi/lho," in Trans. Amer. Ent. 

 Soc, XV, 1888, 45^6. 



Wicl-hani. — "The Pythida? of Ontario and Quebec," in C!ai) 

 Ent., XXXI, 1899, 57-61. 



KEY TO INDIANA GENEBA OF PYTHID.E. 



«. Middle coxae with distinct troclinntins ; last joint of mnxiUnry palpi di- 

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

 h. Third .ioint of antennie not longer than foui-th ; elytra not striate. 



I. BOEOS. 



Jib. Third joint of autennje longer than fourth ; elytra striate ; Imdy much 



depressed. Pytho, 



iKi. Middle eoxaj enclosed by the sterna, without troehantins ; last joint of 



maxillai7 palpi not dilated ; mandibles not visible beyond the labrum : 



length less than 5 mm. 



c. Beak of head broad and vei-y .shoi't. II. Salpikgc-s. 



cc. Beak prolonged. III. Rhinosimus. 



I. BoROS Herbst. 1797. (Gr., "to shine.") 

 But one species from North America belongs to this genus. 



2410 (770S). BoEOS UNicoLOR Say, Journ. Phil. Acad. Nat. Sci., \ . 1S2(;, 

 238 ; ibid. II, -305. 

 Elongate, slender, subdepressed. Uniform piceous, shining, scarcely or 

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



