AMERICAN COLEOPTERA. 99 



Male. — As in nigi-icornis, with the granular space on the face of the sixth 

 segment more irregular. 

 Female. — As in vigricornis. 



By description this and the preceding species are very closely allied, 

 they differ however in the former having a different color and elytral 

 sculpture, the elytra longer and the spongy or granular space on the 

 % sixth segment in form of a hoof and in the present species very 

 irregular. 



Occurs from Canada to Georgia.- 



T. canadensis, n. sp. — Picoous, thorax at sides, elytra at base broadly, 

 sides and apex narrowly, testaceous. Legs testaceous. Antennae ferruginous, 

 four bnsal joints paler. Head black, finely aliitaceous, sparsely punctulate. 

 Thorax very finely alutaceous. Elytra distinctly longer than wide, finely alu- 

 taceous, sparsely punctulate. Abdomen similarly sculptured, beneath smoother, 

 scarcely punctulate. Length .22 — .24 inch; 5.5—6 mm. 



Male. — As in nigricornis. 



Female. — Last ventral as in maculicollis. Last dorsal trilobed, the lobes equal, 

 the middle slightly bifid at tip, (fig. 21). 



This species is one of those in which the one sex closely resembles in 

 its characters an adjacent species, while the other sex presents widely 

 different characters from the corresponding sex of that species. 



Occurs in Illinois and Canada. 



T. finibi'iatns. Grav. — Piceous, elytra pale castaneous, tip narrowly pice- 

 ous. Anteunse black, four basal and the last joint pale. Head and thorax 

 black, very minutely punctulate and very finely alutaceous. Elytra as wide 

 as long, minutely alutaceous, rather coarsely sub-striato-punctate. Abdomen 

 shining, sparsely punctulate, beneath rather more coarsely punctulate. Legs 

 piceous or piceo-rufous. Length .28 — .36 inch ; 7 — 9 mm. 



Male. — Last ventral deeply divided forming long, slender, curved lacinise- 

 sixth broadly emarginate at middle, the centre of the emargination narrowly 

 bordered with granules, face concave. Metasternura frequently elevated in a 

 crest posteriorly. Inner angls of posterior coxae often toothed, (fig. 18, a, b). 



Female. — Last ventral as in maculicollis but with the two median processes 

 more slender. Last dorsal trilobed, the outer lobes slender, the middle broader 

 and shorter and triangularly notched at tip, (fig. 18, c). 



In both sexes the first two ventral segments are carinate at middle. 



Occurs from Canada to North Carolina. 



T. picipcs, Erichson.— Uniformly piceous, moderately shining. Antennae 

 wilh the iiiur basal and the apical joint paler. Head and thorax very minutely 

 punctulate and finely alutaceous, the latter with a feeble trace of median im- 

 pressed line. Elytra as broad as long, sparsely punctured and finely alutaceous. 

 Abdomen finely punctured and alutaceous, beneath more evidently punctured 

 than above. Lengtli .28 — ..S2incli; 7 — 8 mm. 



Male. — As in Jimbriutus with the laciniae nearly straight, (fig. 19, a). 



Female.— Ldsl ventral as m Jimbriatus ; last dorsal as in parallelus, (fig. 19, b). 



