94 GEO. n. HORN, M. D. 



distinctly. Legs pale. The sculpture of the upper surface of the thorax and 

 abdomen consists of fine, short, transverse lines, that of the elytra resembling 

 a cellular arrangement. Length .22 — .26 inch ; 5.5 — 6.5 mm. 



Male. — Last ventral deeply cleft, forming long, slender, curved laeinisej sixth 

 ventral emarginate at middle the outline resembling a brace — ^-v, and with a 

 secondary emargination external to this; posterior margin with equal spinules 

 closely placed forming a comb like structure. Face of segment concave with a 

 granular space at middle divided longitudinally by a smooth line. Last dorsal 

 segment four-dentate, teeth acute, the median somewhat longer, (fig. 5, a, b). 



Female. — Last ventral six-sj)inous, the two central processes broader than 

 the lateral and fimbriate at tip. Last dorsal deeply divided forming two 

 elongate triangular processes, (tig. 5, c, d). 



The sexual characters abundantly distinguish this species, super- 

 ficially it resembles a number of others. 



Occurs in Alaska, (Miiklin); Vancouver, (Crotch). 



T. sciniriiriis. n. sp. — Kufous, shining, elytra with darker cloud poste- 

 riorly. Head black, antennse dark rufous, four basal joints paler. Thorax uni- 

 formly rufous. Elytra slightly longer than wide, sculpture of upper surface 

 as in maculicollis. Body beneath and legs paler rufous. Length .24 — .30 inch; 

 6—7.5 ram. 



Male. — Last ventral deeply cleft, laciniae shorter and less curved than in 

 maculicollis ; sixth ventral concave, the concavity densely covered with short 

 spinous granules, hind margin sinuous with spinules on each side of middle, 

 lateral portion of margin truncate. Last dorsal as in maculicollis, (fig. 6, a). 



Female. — Last ventral similar to that of maculicollis. Last dorsal trilobed, 

 the middle lobe shorter than the lateral and deeply divided, forming two 

 slender processes, (fig. 6, b). 



Occurs at Lake Tahoe and Gilroy (Crotch), California. 



T. iiieni nonius, Grav. — Uniformly piceous, moderately shining. Elytra 

 slightly longer tlian wide, sculpture as in maculicollis, punctuation of elytra 

 somewhat more evident. Underside paler than above, legs testaceous. Varies in 

 color to ]>iceo-testaceous from immaturity. Length .22 — .32 inchj 5.5 — 8 mm. 



Male. — Last ventral as in maculicollis ; sixth concave, the depression partially 

 filled with spiniform granules, hind margin as in maculicollis but not emargin- 

 ate at the sides, (tig. 7, a). 



Female. — Last ventral as in ynaculicollis. Last dorsal similar to semirufics but 

 with the middle lobe less deeply cleft but broader at base and the lateral lobes 

 more slender, (fig. 7, b). 



In some of the Canadian and all of the British Columbia speci- 

 mens, the middle lobe of the last dorsal segment 5 is rather more 

 deeply cleft. This does not appear to be of specific value as the 

 males are not distinguishable. 



Occurs from Canada and New Hampshire to North Carolina, and 

 westward to British Columbia. 



T. (aolij'poroides, n. sp — Piceous, shining. Antennae half the length 

 of body, slender, concolorous. Thorax smooth, shining. Elytra sliglitly longer 

 than wide, very indistinctly alutaceous, shining. Abdomen shining, with very 



