282 GEO. H. HORN, M. D. 



H. Siibstriatus Lee. — Oval, slightly oblong, piceou3 or castaneous, shin- 

 ing. Head sparsely punctate, labrum bilobed. Thorax less than twice as wide 

 as long, narrowed in front, widest in front of base, sides arcuate, hind angles 

 rounded, surface sparsely punctate. Elytra oval, slightly oblong, sides arcuate 

 and gradually narrowed from the base, surface with striae of moderately coarse 

 closely placed punctures, the sutural stria deeper posteriorly, intervals flat with 

 punctures nearly as coarse as those of the striae but less regular. Body beneath 

 sparsely punctate. Length .08— .10 inch ; 2—2.5 mm. 



Male. — Anterior and middle tarsi slightly dilated, posterior femora stout, with 

 a broad tooth near the distal end which is emarginate on the distal edge and 

 obliquely truncate at tip, posterior tibia straight. (PI. VI, fig. 19). 



Female. — Tarsi slender, posterior femora slender without tooth. 

 Superficially this species resembles obtusus and males alone can be 

 distinguished with certainty. With it I have united cwvidens which 

 does not diifer from undoubted males of this species. 



Occurs from Nova Scotia to Colorado, through New York, Michi- 

 gan, and Canada. Nine specimens examined. 



H. latidens Lee. — Oblong-oval, brownish or castaneous, shining. Head 

 very sparsely punctate. Thorax nearly twice as wide as long, narrowed in 

 front, widest in front of base, sides arcuate, apex feebly emarginate, base trun- 

 cate, hind angles distinct but obtuse, surface shining, very sparsely punctate. 

 Elytra oval slightly oblong, sides moderately arcuate, gradually narrowing to 

 base, surface with rows of moderately regular punctures, those of the striae 

 proper and the intervals equal and often with fine oblique lines connecting 

 the punctures, sutural stria rather deeply impressed and continued by rather 

 deeper punctures to the base. Body beneath very sparsely punctate. Length 

 .06— .08 inch; 1.5—2 mm. 



Male. — Anterior and middle tarsi very little dilated, posterior tibiae slightly 

 arcuate near its base, the femur stout with a broad triangular tooth, acute at 

 its summit situated near the distal end. (PI. VI, fig. 21). 



Female. — Tarsi simple. Hind femur slender without tooth. 

 This species diifers in its surface sculpture being ftir less marked 

 and less dense. The sexual characters are quite distitict and seem 

 naturally intermediate between those of substriatus and obtusus. 

 Occurs from Anticosti, Canada to Col. and Cal. Four specimens. 



H. obtusus Lee. — Oblong-oval, castaneous brown, moderately shining. 

 Head sparsely punctate, labrum bilobed. Thorax twice as wide as long, widest 

 at middle, apex a little narrower than base, the former feebly emarginate, the 

 latter arcuate, hind angles rounded, surface not densely punctate, a fine sub- 

 basal line. Elytra very little wider than the thorax, oblong-oval, sutural stria 

 moderately impressed behind the middle continued by punctures to base, sur- 

 face with eight striae of rather coarse punctures, the intervals 2 — 4 — 6 with fine 

 punctures closely placed, 3 — 5 — 7 with coarse punctures distantly placed. Body 

 beneath sparsely punctate. Length .08 — .10 inch; 2^2.5 mm. 



Male. — Anterior and middle tarsi moderately dilated, posterior femur broad 

 and stout, posterior tibiae arcuate. (PI. VI, fig. 17). 



Female. — Tarsi slender, posterior femur much less dilated, the tibia straight. 



