182 H. C. FALL. 



Antennae 10-jointed. 



First ventral suture straight, the second segment not quite as long as the fifth. 

 Prothorax quite conspicuously narrower than the elytra, the sides without 



acute margin, except at hind angles 1. defectus. 



Prothorax very little narrower than the elytra, the sides acutely margined 

 throughout. 

 Disk of prothorax slightly gibbous and compressed behind, sides conver- 

 gent anil usually feebly sinuate behind the front angles. 



2. carinatus. 

 Disk of prothorax strongly gibbous, sides straight and nearly parallel for 



more than two-thirds their length 3. linearis. 



First ventral suture Insinuate, broadly posteriorly arcuate at middle, second 



segment a little longer than the fifth 4. pusillus. 



Anteuupe 11-jointed. 



Prothorax equal in width to the elytra, its side margin feeble anteriorly; sec- 

 ond ventral segment barely as long as the fifth, first suture straight; 



brown ; length 3 8 mm 5. lal icollis. 



Prothorax slightly narrower than the elytra, side margin wide; second ven- 

 tral segment equal to the fifth ; black ; length about 5 mm. 



6. unibrosus. 



Prothorax much narrower than the elytra; second ventral segment obviously 



longer than the fifth, first suture bisinuate ; disk of prothorax strongly 



elevated and compressed, side margin bisinuate- • • -7. gibhicollis. 



1. H. dei'ect.us n. sp. — Dark brown, opaque. Antenna? 10-jointed. Pro- 

 thorax much narrower than the elytra, disk rather strongly gibbous and moder- 

 ately compressed posteriorly, sides not margined, slightly convergent anteriorly, 

 and with very faint apical sinuation. Elytra striate as usual, the interspaces 

 more evidently rugose than in carinatus. Ventral sutures straight. Length 4.5 mm. 



The unique type is apparently a female and was taken at Tyngs- 

 boro, Mass., by Mr. Blanchard, who informs me that he found it on 

 an oak stump in the woods. The obliteration of the side margin of 

 the prothorax, if it be not accidental, is an extraordinary character, 

 ami one by which this species may be recognized at a glance. The 

 prothorax is relatively narrower than in any other of our species 

 except gibbicollis. 



2. H. carinatus Say. — Eed brown to piceous brown. Prothorax subequal 

 in width to the elytra; sides rounded, straighter and moderately convergent in 

 front, with or without a short sinus at the anterior angles, hind angles undefined ; 

 disk slightly gibbous and a little compressed posteriorly. Elytra with moder- 

 ately impressed, strongly and closely punctate striae. Antenuje scarcely half the 

 length of the body, first joint arcuate and not much thickened; second about 

 three-fourths as wide as the first and a little longer than wide; third similar to 

 the second but smaller; fourth to seventh short and transverse, the fifth and 

 seventh a little smaller than the fourth and sixth ; eighth in the male subparallel 

 and nearly two aud one-half times as long as wide, twice as wide as the preced- 



