60 THE ENTOMOLOGIST. 



Halictus forresti, n. sp. 

 <y . Length aboui 6 mm. ; black, the anterior half of the clypeus 

 pale dull yellow, the yellow a little produced upwards in the middle 

 line ; face narrow ; face and front with much short greyish-white hair ; 

 scape very short ; flagellum extremely long, black ; mesothorax dullish ; 

 upper edge of prothorax, and tubercles, with much white tomentum ; 

 post-scutellum with white tomentum ; area of metathorax very coarsely 

 irregularly wrinkled ; tegulae large, dark reddish, with a few minute 

 punctures toward the base ; wings clear, iridescent, stigma and ner- 

 vures dark rufo-piceous ; b. n. falling some distance short of t. ni. ; 

 first r. n. meeting second t. c. ; outer nervures distinct ; legs black, 

 tarsi dark reddish ; abdomen entirely black, the hind margins of the 

 segments shining. 



Hah. Queensland (Gilbert Turner, 406, Hy.). Looks much 

 like H. sturti, but cannot be its male, the sculpture being so 

 different. 



University of Colorado : Oct. 4th, 1905. 



A GUIDE TO THE STUDY OF BRITISH WATERBUGS 

 (AQUATIC HEMIPTERA OR RHYNCHOTA). 



By G. W. Kirkaldy. 



(Continued from vol. xxxviii. p. 236.) 



Cymatia,* Flor. 



Face excavated in the male, convex in the female. No 

 apparent stridular area on anterior femora. False in the male 

 slender, elongate, subcylindric, inferiorly set with a few strong 

 bristles, and terminated by a crooked knife-like claw. In the 

 female the palse are similar to those of the male, but lack the 

 claw. 



The habits are like those in the following genera. There are 

 two British species, easily distinguished by their size, bonsdorjii 

 being double that of coleoptrata. It is not likely that the other 

 species will be found in Britain. 



1. C. BONSDORFFii (C. R. Sahlberg). Figured by Saunders 

 and many others ; the male palse are figured by me (Quekett 

 paper). Distributed probably over the greater part of the British 

 Isles t ; recorded from Sratli glas to Woking, and from Norfolk 

 to Harris. In Ireland, Mr. Halbert has taken it near Dublin. 

 I have taken it freely in the Scottish Highlands and in Surrey, 

 also in Brittany. 



'■"' Greek hyma, a wave. 



I The detailed distribution of the British Aquatic Bugs will be given in 

 au appendix. 



