AMERICAN PniLOSOPIIIfAL SOCIETY. 513 



at base, marginal one extending from the middle towards the tip ; 

 feet rufous. 



This insect varies in being of a paler color. I found it numer- 

 ous in fresh water ponds on Sullivan's Island, South Carolina. 



[A species of Cu^ielntus afterward.'^ described as C. lO-Htriatus 

 Aube. — Lec] 



9. C oiiTUSATUS. — Black ; elytra four-spotted, punctured. 

 Length three-tenths of an inch. 



Body black; head with two obsolete piceous spots on the vertex, a 

 single [100] impressed, abbreviated, frontal line each side; antennne 

 and palpi piceous; elytra with two or three distinct series of punc- 

 tures, somewhat irregular, scattered behind, each elytron with a 

 pale, fenestrate, elongated, submarginal spot behind the middle, 

 and a subtriangular one near the tip ; feet piceous. 



Yar. (I. Body beneath testaceous; frontal spots obsolete. 



This species approaches very near to /incstra/isy but diflcrs in 

 having the series of large distinct punctures, in being not more 

 than half the size of that insect and more obtuse before. Found 

 on Mr. 11. Haines's farm, Germantown. 



[A species of Agahus afterwards described as A. (/agates Aube. 

 — Lec] 



10. C. STAONINUS. — Oval, black, beneath rufous ; vertex with 

 two piceous spots; elytra with a submarginal whitish Hue be- 

 hind. 



Length less than seventh-twentieths of an inch. 



Dytiscua stagninus Melsh. Catal. 



Body oval, obtuse behind, black, beneath rufous; head with two 

 obscure piceous spots on the vertex, a single, impres.scd, transverse, 

 abbreviated line and point each side before ; nasus and labrum 

 piceous; elytra with three dilated lines of irregular, profound, 

 rather large punctures, becoming confused at tip, an abbreviated, 

 submarginal, whitish line on each elytron, originating near the 

 middle of the tip ; tergum with a few hairs each side behind. 



[Also an Agubus, afterwards described as A. sirioia Aubd;. — 

 Lec] 



1823.] 83 



