OF PHILADELPHIA. 263 



rior tarsi threee toothed, the intermediate tooth largest, three 

 smaller teeth above. 



Length less than one-fifth of an inch. 



From the character of the fifth stria this species might be mis- 

 taken for the interruptus of Beauvois, but it is a much smaller 

 insect, and the interruptus has two abbreviated striae at the base 

 of the elytra. 



It is an inhabitant of Missouri ; I obtained two specimens 

 when with Major Long's party in that region. 



ff. Elytra destitute of the marginal striae. 



5. H. INDISTINCTUS. — Thoracic striae entire ; dorsal striae 

 four, entire; fifth stria abbreviated, obsolete ; sutural stria slight. 



Body black, immaculate : head with the transverse line very 

 distinct : thorax with an indentation on the middle of the poste- 

 rior submargin ; lateral strias entire and not approaching at their 

 tips: elytra with four entire dorsal striae; fifth abbreviated, more 

 or less obsolete, generally consisting of five or six punctures ; 

 sutural stria not deeply impressed, extending [36] rather 

 beyond the middle, and not reaching the tip : anterior tibiae tri- 

 dentate, terminal tooth largest, emarginate. 



Length less than one-fifth of an inch. 



B. Thoracic stria single. 



6. H. SEDECIMSTRIATUS. — Dorsal striae entire; fifth connected 

 to the sutural at base. 



Body black, immaculate : head with the transverse line dis- 

 tinct : antenniB ferruginous, paler at tip : thorax with the stria 

 entire and well impressed : elytra with the dorsal and sutural 

 striae entire, the latter uninterruptedly connected with the fifth 

 at base : marginal striae two, exterior one entire, inner one ab- 

 breviated at the termination of the small oblique line; terminal 

 margin with small profound punctures : feet piceous : anterior 

 tibiae tridentate. 



Length more than three-twentieths of an inch. 



This species is not uncommon, and seems to extend to many re- 

 mote parts of the Union, as I obtained a specimen in Missouri. 

 The fifth and sutural stria; of the elytra unite at base as obviously 

 as those of the 12-striafm of Europe and Africa; it is, therefore, 

 somewhat similar to the americanus of Paykull, which, however, 

 difiers by being altogether destitute of the marginal stride of the 

 1825.] 



