562 TRANSACTIONS OF THE 



GYRINUS Linn. 



1. G. EMARGINATUS Say, Trans. Amer. Philos. Soc. — Since 

 described by Germar under the name of vtttatus, Spec. Nov. 



2. G. ANALis Say, Trans. Amer. Philos. Soc. — Germar is of 

 opinion that this is the same as natator P.; but on comparison, I 

 find it to difiier in many small characters, the most obvious one 

 of which is the color of the epipleura, that of the natator being 

 light piceous, whilst in the analis it is of a bronzed black, &c. 

 It is no doubt a closely allied species. 



3. G. OBTUSUS. — Black; feet honey-yellow ; behind obtuse. 

 Inhabits Mexico. 



Body black, polished ; head with two indented dots between 

 the eyes ; mouth piceous ; antennae piceous-black ; thorax with 

 the anterior lateral, posterior lateral and medial impressed lines 

 very distinct ; elytra obtuse behind and widely truncate ; near 

 the tip obviously depressed ; punctures well impressed, in regu- 

 lar series, the intervals not impressed; beneath dark piceous, 

 somewhat paler on the edges of the segments ; feet and tip of 

 the venter honey-yellow. 



Length over one-fifth of an inch. [448] 



It may be distinguished from the analis and Umhatns nob., 

 and from the natator Fabr., and marinns Gyl., in being more ob- 

 tuse behind and the consequent greater truncation of the elytra. 



4. G. PAROUS. — Black ; feet honey-yellow. 

 Inhabits Mexico. 



Body rather robust, black, highly polished ; head with two in- 

 dented, oblique lines between and before the eyes : thorax with 

 the impressed lines very obvious ; elytra with very distinct, well 

 impressed series of punctures, the intervals not at all impressed ; 

 tips obtusely rounded ; feet honey-yellow. 



Length nearly one-fifth of an inch. 



In comparison with inimdus Fabr. this species is a little longer 

 and much more robust, more highly polished, and the impressed 

 lines of the thorax and dots of the elytra are more profound and 

 distinct. It is somewhat smaller than either of those I have 

 before described, and the punctures of the elytra are, notwith- 

 standing, larger. 



[Vol. TV. 



