98 GEO. H. HORN, M. D. 



numerous grannies. Last ventral deeply triangularly notched as in mimus. 

 Last dorsal normally quadridentate, (fig. 15, a). 



Female. — Last ventral with the usual six processes the two central broader 

 and fimbriate. Last dorsal with the middle lobe slightly shorter than the outer, 

 deeply divided into two slender processes, (fig. 15, b). 



The characters giveu iu the table will at once enable this species to 

 be knowu. 



Two specimens kindly sent me by Dr. E. A. Schwarz, collected at 

 Bachewauuug Bay, Lake Superior. 



T. paralleltis, n. sp. — Form parallel, color pieeous, thorax, elytra, antennae 

 and legs rufous. Head black, smooth, shining, a faint vertical fovea. Thorax 

 rufous, shining, finely alutaceous and very minutely sparsely punctured. Elytra 

 slightly longer than wide, rufous, hind margin slightly darker, surface faintly 

 sulcate, finely alutaceous and rather coarsely but sparsely punctured. Abdo- 

 men pieeous, hind margins of segments paler, surface very minutely alutace- 

 ous and finely and sparsely punctured. Legs rufous. Length .24 — .26 inch; 

 6—6.5 mm. 



Male. — Last ventral deeply divided, lacinise stout but arcuate; sixth ventral 

 scarcely at all concave, broadly emarginate, without spinules or spongy space. 

 Last dorsal four-dentate the lateral teeth short obtuse, (fig. 16, a). 



Female. — Last ventral as in maculicollis but with the middle lobes rather 

 broader. Last dorsal with the lateral lobes rather stout and sinuate near the 

 tip, middle lobe slightly longer than the outer lobes and divided to the base in 

 two slender processes, (Bg. 16, b). 



This species is of more parallel form than any other in our fauna, 



and its facies is that of Olisthaerus but more convex. 



Occurs in Illinois and Canada. 



T. iiigricoi*iii!$, Mann. — Black, shining, elytra dark-brown, legs piceo- 

 testaceous. Head and thorax black, minutely and sparsely punctulate and 

 obsoletely alutaceous. Elytra sligiitly longer than wide, distinctly punctulate, 

 obsoletely alutaceous and with two rows of distant and larger but obsolete 

 punctures. Abdomen finely alutaceous, sparsely punctured more densely at 

 base, beneath more coarsely punctured. Antennse pieeous. Length .24 — .26 

 inch ; 6 — 6.5 mm. 



Male. — Last ventral deeply divided forming two triangular processes not 

 curved nor slender. Sixth ventral emarginate at middle, not pectinate, at 

 middle concave, the concavity entirely filled with acute granules. Last dorsal 

 as in maculicollis, (fig. 17, a). 



Female. — Last ventral entire middle lobo fimbriate, lateral processes indicated 

 b^' small teeth only. Last dorsal entire, trilobed, lobes united, the middle 

 longer and acute, (fig. 17, b, c). 



Occurs from Alaska to Vancouver. 



T, liiridliK, Erichson. — Pieeous, shining, elytra jialc luteous, legs testace- 

 ous, antennae ferruginous, basal joints paler. Head and thorax black, sculp- 

 tured as in nigricornis. Elytra not longer than wide, very minutely jjunctu- 

 late. Abdomen more finely punctured than nigricornis, but beneath similarly. 

 Length .24 inch; 6 mm. 



