Sept., igi;.] Fall : New Dytiscid^. 173 



The series before me comprises 2 males and 4 females from Staten 

 Island, New York; 2 females from Gettysburg, Pa. (Devil's Den), 

 and a male from Atoka, " Ind. T." (Wickham). 



The Staten Island and Gettysburg specimens were all taken in 

 fresh running water, according to Mr. Sherman, from whom they 

 were received, and to whom in recognition of long friendship it gives 

 me great pleasure to dedicate the species. 



In the greatly abbreviated anterior claw of the front male tarsus, 

 shermani agrees nearly with clypealis, the latter, however, is a dis- 

 tinctly more broadly oval species, with distinctly thickened clypeus 

 and the side margins of the prothorax in the female sinuate at the 

 anterior angles. In its more elongate form shcnnani agrees closely 

 with concinnus and allies. 



Hydroporus dixianus new species. 



Moderately broadly ovate, strongly shining, very finely and sparsely pu- 

 bescent, flavotestaceous, elytra with diffuse or ill-defined fuscous vittiform 

 markings ; punctuation above fine and sparse throughout, the elytral punctures 

 showing a tendency to become connected transversely so as to form a feeble 

 wavy strigosity. Antennae entirely pale ; head feebly impressed, the clypeus 

 not thickened. Thoracic side margins very fine, a faint shade at the middle 

 of the apical margin, and sometimes very narrowly along the basal margin. 

 Elytra widest but little behind the base, apex pointed. Body beneath uni- 

 formly rufotestaceous, prosternum without anterior intercoxal protuberance ; 

 metasternum rather deeply channeled medially, sides moderately coarsely, 

 closely punctate ; coxal plates less coarsely and closely punctate, becoming 

 rather widely smooth posteriorly ; ventral segments very finely and sparsely 

 punctate except near the base. Anterior tarsi only moderately dilated, the 

 middle tarsi evidently narrower. Length 3 to 3.2 mm.; width 1.6 to 1.7 mm. 



Georgia (Spring Creek, Decatur Co., 26-28 Aug., '13). 



The type series consists of six examples collected by Mr. J. C. 

 Bradley, and sent me by Mr. Sherman. The type itself is returned to 

 the Cornell University Collection at Ithaca, N. Y. There are no sex- 

 ual differences observable. 



The species is evidently closely related to mellitus, the form, color 

 and markings being nearly identical in both ; mellitus is, however, a 

 distinctly smaller species, the punctuation of the upper surface every- 

 where less fine, the elytra not showing the feeble transverse strigosity 

 observable in dixianus, and the metasternum rather more coarsely 

 and uniformly punctate. The resemblance of dixianus to vittatipcnnis 



