199 



if adult, it will undoubtedly form a new genus in the family. We hope 

 Mr. Zabriskie will be able to obtain more material. The specimen was 

 captured in July, 1890, in the stream of the waterworks at Flatbush. 



The color is blackish with siimlry whitish spots visihlc from above; one coveriiij^ 

 the middle of the prothorax extendiug on to the himl margin of the head; two on 

 the mesothorax; a lateral row on each of the first seven abdominal Joints, at the 

 base of the middle coxa>, posterior coxae, base of the trochanters and base of the 

 tirst joint of the anteunse. The antennie (not palpi, as Mr. Zabriskie describes) are 

 the most striking peculiarity of the insect. They are four-jointed and are evidently 

 prehensile or raptatorial. The basal joint is stout, nearly as long as the third and 



Fig. 22. — Undetennined Hydrobatid Water-bug: a, dorsal view; b, veutral view- 

 , antenna from above; d, same from below — still more enlarged (origmal). 



-greatly enlarged ; 



fourth together, bulging near the middle, and furnished with a tuft of hairs or 

 bristles abruptly cut off, and a few straggling bristles and longer and finer hairs at 

 the sides. Joint 2 is small, Avith a curved spine near the nether base; joint 3 

 elbowed, dilated distally and beneath, with a pale hyaline disk or cushion sur- 

 rounded by a few stili' hairs; terminal joint ending in a hook with a stout i)roug 

 about the middle. 



The beak is short and stout, reaching to the base of the prosteruum. The eyes 

 are large and globular, and there are two minute ocelli. The front legs are short 

 and robust, the tarsi two-jointed, the basal joint almost hidden, and the terminal 

 joint prolonged into a hook and having a claw attached at its base. Middle legs 



