OP PHILADELPHIA, 271 



HOLOLEPTA. 



1. H. ^QUALis. — Polished; mandibles as long as the head, 

 simple. 



Body polished, suboval : head with an obtuse spine above each 

 antenna; : antennte dark ferruginous : mandibles simple, as long 

 as the head : elytra obliquely truncated at tip, sutural shorter 

 than the external edge ', three much abbreviated striae at base, 

 the inner one indistinct, marginal strias very obvious : anterior 

 tibia three-toothed, the anterior one dilated and emarginate. 



Length two-fifths of an inch, nearly. 



Common under bark of decaying trees. I formerly considered 

 it identical with the i-dentatus Fabr., of South America, but on 

 comparison, I agree with Dejean that it is a new species. 



2. H. FOSSULARis. — Anterior angles of the thorax with an 

 excavated spot. 



Body highly polished, suboval : head with an obtuse spine 

 above each antennae : antennae dark ferruginous : mandibles sim- 

 ple, rather longer than the head : thorax with a profoundly im- 

 pressed, longitudinally-oval spot on each anterior angle : elytra 

 obliquely truncated at tip, the sutural shorter than the external 

 edge, three much abbreviated striae at base, the inner one obso- 

 lete; marginal striae very obvious : anterior tibia three-toothed, 

 the anterior tooth dilated and emarginate. 



Size of the preceding, which it very much resembles, and of 

 which it may possibly prove to be the male. 



[From Journal of the Academy of Natural Sciences, vol. 5, December, 

 1825, pp. 160—202.] 



Descriptions of new species of Coleopterous Insects inhabiting the United 



States. 



Read January 18, 1825. 



DYTISCUS Linn. Latr. 



1; D. LIBERUS. — Thorax obscure rufous; elytra brownish, gla- 

 brous, with three obsolete series of punctures. 



Body impunctured, glabrous, oval : head very obscure rufous ; 

 antennES and palpi pale : thorax obscure rufous, somewhat pice- 

 1825.] 



