1^4 GEORGE H. HORN, M. D. 



Not common. Occurs in the Middle States and Canada (Pettit), 



D. striatulus, Say, Journ. Acad. V, p. 192. cribrosus, Lee. (Rhyssemus,) Agass. 

 Lake Super, p. 225. Harold, loc. cit. — Oblong, robust, piceous black, opaque. 

 Head coavsely punctured; front hemihexagonal, clypeus feebly emarginate at 

 middle and subangulate on each side. Thorax strongly convex, densely cr'b- 

 rate and with a distinct, broad longitudinal impression ; sides nearly straight 

 in front, deeply sinuate at base ; distinctly margined at the sides. Elytra oval, 

 strongly convex, slightly broader behind the middle, surface strongly, acutely 

 carinate, intervals with a single row of coarse punctures. Body beneath 

 opaque, coarsely punctured. Legs brownish, coarsely punctured. First joint of 

 middle and hind tarsi long. Length .16 — .20 inch; 4 — 5 rjim. 



Occurs from the Middle States northward to Canada, but not com- 

 mon. 







Descriptions of new species of HISTERID^ of the United States. 



BY GEO. H. HORN, M. D. 



HISTER, Linn. 

 H. ITlkei, n. sp. — Oblong oval, sides feebly rounded, black, moderately shin- 

 ing. Front with distinct semicircular line. Thorax convex, sides feebly 

 rounded, slightly broader behind, margin fimbriate with short hairs; exterior 

 stria close to margin, entire, inner stria distant, slighily sinuous and more dis- 

 tant in front. Elytra with three entire dorsal strise, a fourth and fifth apical, 

 the former being one half and the latter one-third the length of third; sutural 

 stria abbreviated in front; subhumeral stria extending one-half from apex to 

 base and close to the first dorsal, gradually diverging and with a short slightly 

 arcuate extra-humeral stria; oblique humeral stria distinctly impressed. Pyr 

 gidium and propygidium coarsely punctured, the latter rather more sparsely. 

 Body beneath black, shining, abdomen fuscous and coarsely strigosely punc- 

 tured toward the sides ; side pieces of meso- and metasterna with few coarse 

 punctures. Anterior tibiae bidentate, hind femora and tibiffi stout, the latter 

 irregularly biseriately spinulose. Length (tijj of suture to anterior margin of 

 thorax) 20 inch; 5 mm. 



This species differs from all our others of group 3, Lee, by its more 

 elongate form, very obtuse in front, and by the well detiiio^l internal 

 subhumeral stria with extra-humeral appendage and also by the pre- 

 sence of the fourth ami fifth dorsal strife. The legs are entirely black, 

 the hind tibiae robust as in arcuatus and irregularly biseriately spinulose. 

 This species should be referred to the fourth group of Marseul. 



I have named this species in honor of Mr. H. Ulke, of Washington, 

 by whom it was sent me under the name insfrafiis, which species has 

 no subhumeral stria. The elytra are colored as in instratus. 



Occurs in Nebraska. 



H. Arizonae, n. sp. — Oval, moderately convex, black, shining. Antennae 

 piceo-rufous. Front with distinct semi-circular stria. Thoracic margin sparse- 

 ly pilose, and witli two entire nearly parallel strife. Elytra rufous and with 



