INHABITING NORTH AMERICA. 107 



Thorax with a large, conspicuous, deep black spot on the 

 anterior margin. 



Elytra paler tlian tlie body, stria' proloiindly punctured, 

 punctures colour of the elytra, suture, l)asc, tip, and six 

 spots on each elytron deep black, spots placed l, l, a, l, l, 

 the pcnultiiuatc one joining the suture, suture at the centre 

 dilated into a spot. 



Genus Gyuinus. Lin. 



Antennae shorter than the head, second joint with a lateral 

 process ; eijes apparently four ; two posterior pairs of feet 

 dilated, very much compressed. 



Species. 



1. G. .'9wje;7>fl;»/s blackish-bronze, beneath piccous; elytra 



smooth, slightly sinuate at tip. 

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



inch. 



Gyrinus Amtricamts Itevis, atcr, opacu«, pcdibus quatuor posticis testaccis. 

 Fuhr. Sijsl. Ekut., Purs 1, p. Z75. 



G. .Imenrnnus bron/.t; ; pattcs fernigiripuscs ; ilytrns simploi), prr-<quc atriccs. 

 Oliv. Ent., III., A'o. 41, p. 12, pl.\, Jig. 3. 



G. Americanus, Dr. Forsber^. Tran». Vpxnl. Xnrirfi/. 



Body oblong-subovatc, blackish, slightly tinged with bron/.c 

 or purplish, beneath piceous. 



Head, labrum deeply ciliated with white hair. 



Thorax impunctured ; sciitd none. 



Elytra with very minute, obsolete, distant punctures, di.sk 

 plain, each side with four or five obsolete stri.T, tip dis- 

 tinctly and very obtusely sinuated, a projecting angle at the 

 sutural tip. 



Poststerman witli distant profound piinrtnres before ; /r/ 

 testaceous, anterior pair rufous and destitute of a femoral 

 spine. 

 .\ verv common insect. When caught, a lactescent fluid 



