CATALOGUE OF INSECTS. 193 



DINETJTES MacL. 



D. vittatus Germ. New Brunswick and southward everywhere, in ditches 

 and small streams ; never in ponds. 



D. ernargiiiatus Say. Middle States generally, and certain to be found in 



New Jersey. 

 D. hornii Roberts. Westville (Reinecke), probably throughout the State. 

 D. nigrior Roberts. New Brunswick, and probably elsewhere in the State. 

 D. assimilis Aube. Common throughout the State. 

 D. discolor Aube. Common throughout the State. 







Family HYDROPHILIDJE. 



The "water scavengers"; usually black in color, sometimes with yellow, 

 orange or red markings along the margins, usually smooth, polished and very 

 convex above, flattened below. The antennae are short and clavate, or clubbed 

 at the tip ; hence they are easily distinguished, even by a novice, from the water 

 divers. A number of the smaller species have a little different shape and have 

 the surface rough and pitted, crawling, rather than swimming, on the soil and 

 vegetation underneath the surface. Some other small species live in moist 

 earth or in dung or other fermenting and decaying vegetation. They are of no 

 economic importance. 



HELOPHORTJS Fabr. 



H. lacustris Lee. Madison, VII, 1 (Pr), Staten Island, Ft. Lee (Bt), Hoboken 



(LI), Orange, VI (Ch), Palisades: always common. 

 H. lineatus Say. Madison (Pr), Woodside, salt meadows (Bf), Ft. Lee, V 



(Bt), Newark (Soc), g. d. (Li). 

 H. tuberculatus Gyll. Westville (Li). 



HYDROCHUS Leach. 



H. scabratus Muls. Ft. Lee, V (Bt), Newark (Soc), Long Branch (Ch), 



Westville, I, 28, sifting (W), g. d., common (Li). 

 H. insequalis Lee Staten Island, V (Bt), "New Jersey" (U S N M). 

 H. subcupreus Rand. "New Jersey " (Roberts, U S N M). 

 H. variolatus Lee. Camden, not rare (Li). 

 H. squamifer Lee. Lake Hopatcong (Pm), Merchantville, III, 10, DaCosta, 



Anglesea, VII, 30 (Boerner). 



OCHTHEBIUS Leach. 



O. benefossus Lee. "New Jersey" (Horn); but Mr. Schwarz think? 

 locality incorrect. 

 13 ENT 



