86 



ENTOMOLOGICAL NEWS 



[Mar., '22 



Segments of body deeply constricted, with posterior division longer 

 and somewhat thicker than the anterior. Pore well removed caudad 

 from furrow. Tergites behind constricting furrow clothed conspicu- 

 ously with numerous short straight hairs, similar ones also present on 

 anal tergite and valves. 



Last tergite widely rounded behind, equalled or a little exceeded by 

 the valves. Valves weakly margined, flattened on each side. Anal scale 

 with caudal margin nearly straight. 



Trichonannolene guiananus gen. et sp. nov. Gonapods of male, posterior view. 



The gonopods of male as shown in the accompanying figure. Behind 

 the gonopods a pair of minute, conical appendages represent the pos- 

 terior legs of the segment in abortive condition. 



Number of segments in male, thirty-one to thirty-eight; in the female, 

 to forty-four. 



Length, to about 12 mm. 



Type in the Museum of Comparative Zoology, Cambridge, 

 Massachusetts. 



Food during Captivity of the Water-Striders, Gerris 

 remigis Say and Gerris marginatus Say (Hem.). 1 



By C. F. CURTTS RILEY, University of Manitoba, Winnipeg, 



Canada. 



The writer has been giving attention to the general habitat 

 responses of water-striders for the past ten years. In the 

 course of these investigations, a considerable amount of data 



1 Certain phases of the food problem of aquatic Hemiptera have been 

 discussed by me in another paper, in which reference is made to the 

 food of water-striders: 1918. Riley, C. F. C. Food of Aquatic Hem- 

 iptera. Science, N. S., Vol. XLVIII, pp. 545-547. 



