^62 ACADEMY OF NATURAL SCIENCES 



Var. b. Ferruginous. 



Altogether distinct from the unicolor of Fabr., which has the 

 exterior marginal and abbreviated striae very distinct, and the an- 

 terior tibiae six toothed. Dr. J. F. Melsheimer has given it the 

 name which I adopt. It is a very common species, inhabiting 

 throughout the Union. I obtained a specimen [34] in Arkansa. 

 It differs from H. thoracicus Payk., by having the sutural stria. 



3. H. ARCUATUS. — Elytra with a large rufous lunate vitta ; 

 anterior tibia with two entire teeth. 



Body black, polished : head with the transverse line very dis- 

 tinct : antennae tipped with fulvous : thorax ciliated each side 

 with yellowish hairs ; striae entire, reaching the base and not un- 

 dulated near the tip : elytra with a broad rufous vitta, com- 

 mencing at the middle of the base, where it is dilated, and curving, 

 so as to reach the sutural stria near the tip; marginal stria very 

 distinct, entire ; three dorsal striae entire ; fourth and fifth ab- 

 breviated, not reaching the middle ; sutural striaj extending 

 rather beyond the middle ; a slight transverse indentation near 

 the tip : thighs bright rufous : anterior tibise with two very 

 prominent entire teeth. 



Length one-fourth of an inch. 



Var. a. Transverse line of the head not very obvious ; fifth 

 stria of the elytra obsolete. 



This species is rather rare. In its general appearance as re- 

 spects color, it resembles the sinuatus Panz., which, however, is 

 destitute of the marginal stria. The variety occurred in Arkansa. 



4. H. BIFIDUS. — Thoracic strise entire ; marginal and four 

 dorsal striae entire ; an oblique abbreviated stria at base. 



Body black, immaculate : head with the transverse line very 

 distinct; an obsolete, longitudinal line visible in a particular in- 

 sidence of light : antennae with [35] the tip of the clavum pale : 

 thorax, strias entire, not approaching at tip : elytra, marginal 

 stria entire, near the base exterior to the humerus, bifid and di- 

 raricated ; an abbreviated, very oblique stria from the humeral 

 angle, inwards towards the first dorsal stria ; dorsal striae four, 

 entire ; fifth not reaching the middle ; sutui-al stria extending 

 beyond the middle ; an abbreviated, very oblique stria at base, 

 being the origin of the very widely interrupted fifth stria : antc- 



[Vol. v. 



