AMERICAN PniLOSOPIIICAL SOriETV alO 



margin J clytni palor than the body, stria3 proluuiully j)Uiictured, 

 punctures color of the elytra, suture, base, tip and six spots on 

 each elytron deep black, spots placed 1, 1, 2, 1. 1, tlie pcnulti- 

 niate one joining the suture, suture at the centre dilated into a 

 spot. 



OyRIXUS Linn. 



Antennce shorter than the head, second joint with a lateral 

 process ; eyes apparently four; two posterior pairs of feet dilated 

 very much compressed. 



1. (J. AMEiiicAXUS. — Blackish bronze, beneath piccous ; elytra 

 smooth, slightly sinuate at tip. 



Length nine-twentieths of an inch, breadth more than one- 

 fourth of an inch. 



Gyrinus americanus, IcEvis, nter opacus, pedibus quatuor posticis tcsta- 

 ceis. Fabr. Syst. Eleuth. 1, 275. 



G. americanus, bronze ; pattcs fcrrugineuses ; elytres simples, presque 

 strices. Oliv. Ent. 3. No. 41, p. 12, pi. 1, fig. .''). 



G. americanus Dr. Forsberg, Trans. Upsal Society. 



Body oblong, subovate, blackish, slightly tinged with bronze 

 or purplish, beneath piceous ; head, labrum deeply ciliated with 

 white hair; thorax impunctured, scutel none; elytra with very 

 minute obsolete, distant punctures, disk plain, each side with 

 four or five obsolete stria?, tip distinctly and very obtusely 

 sinuated, a projecting angle at the sutural tip ; poststernum with 

 distant profound punctures before ; feet testaceous, anterior pair 

 rufous and destitute of a femoral spine. 



A very common insect. When caught, a lactescent fluiil [108] 

 is secreted from the anal segment, that diffuses a strong odor 

 very similar to that of the flowers of the Calycanthas. 



2. G. E.MAUiilN'ATUS. — Blackish-broiizc, beneath 1)laekish ; 

 elytra smooth, each simply rounded at tip. 



Length nine-twentieths to eleven-twentieths of an inch. 



Body blacki.^h-grccn, slightly bronzed ; beneath piceous black 

 or fuliginous ; head blackish-grccn ; labrum at tip and antenn.T? 

 at ba.se ciliated with white hairs; thorax impunctured; scutel 

 none ; elytra with very minute, obsolete, distant punctures, stria) 

 seven ^or eight, more distinct in the % , obsolete, each elytron 

 1823.] 



