6 Bulletin of the Brooklyn Entomological Society Vol. XV 



De la Torre Bueno^° (p. no), while not making a categorical 

 assertion, intimates that Gerris rufoscutellatus Latreille may mi- 

 grate by flight. According to Essenberg,^^ Gerris orha may be 

 stimulated to flight during its phototactic responses. Below is 

 given a quotation from this observer : 



Gerris remigis [orba] is positively phototactic. If it takes 

 to its wings once in a while it always flies toward the light, pro- 

 ducing a buzzing sound as it flies. 



It is to be inferred, from a statement by de la Torre Bueno^^ (p. 

 203), that the alate forms of Gerris remigis, probably, are able 

 to migrate by flight. The quotation from him follows : 



These winged adults are generally found solitary in the most 

 unlikely places — isolated little pools, springs, rock-holes, beach 

 drift, far from the favorite haunts of this stream-loving bug. 



During a discussion of the locomotor responses of Gerris remigis, 

 he^^ states that : 



The wings, when present, are serviceable, the European 

 forms being recorded as using them in flight, not observed with 

 our species. 



This writer,^* in the paper to which I have referred, remarks, 

 apparently with reference to the genus Gerris in general, that : 



Some species are recorded to fly by night, but ours have not 

 been observed doing so. 



De la Torre Bueno^^ (pp. 295-296), writing of Gerris m^rginatus, 

 states that: 



10 de la Torre Bueno, J. R., " Remarks on the Distribution of Heterop- 

 tera," Canadian Entomologist, Vol. XLV (1913), pp. 107-111. 



^1 Loc. cit'., p. 400. 



12 de la Torre Bueno, J. R., " Life-history and Habits of the Larger 

 Waferstrider, Gerris remigis Say (Hem.)," Entomological News, Vol. 

 XXVIII (1917), pp. 201-208. 



^3 Ibid., p. 204. 



1* Ibid., p. 205. 



15 Ibid., " Life History and Habits of the Margined Water Strider, 

 Gerris marginatus Say (Hem., Het.)," pp. 295-301. 



