162 The Ohio Journal of Science [Vol. XXI, No. 5, 



of the Gerrids offers evidently a striking contrast to that of 

 Trepobates. Half of all specimens were secured at station 3. 

 Larger water striders are often observed to be numerous in 

 shady situations, but if shade was a determining factor here, it 

 could not explain the very common prevalence of this same 

 species at station 11, which had scarcely any shade. 



Drake reported that in 191(3 he captured also, as relatively 

 scarce among G. niarginatiis, several specimens of Gerris con- 

 formis (Uhl.), more of G. biienoi Kirk., and a few of G. canali- 

 cidatiis Say and of G. rufosciitcUatus Latreille. 



Tenagogonus hesione Kirk. This water strider, first 

 reported for this region by Osborn and Drake ('15) and said 

 by them to be common in the apterous but rare in the macrop- 

 terous form, was represented in my collection by one macropter- 

 ous specimen secured at station 11. 



Trepobates pictus H. S. This little water strider was abun- 

 dant and took first rank among Hemiptera, in numbers of 

 individuals. Nymphs of all stages and adults of the apterous 

 form were taken together. The gregarious habit was very 

 noticeable. Practically none w^ere present on the small pond. 

 With these few and those at station 9 excepted, all were present 

 on absolutely open surfaces of the large pond, though chiefly 

 near shore. This distribution was contrary to that of G. mar- 

 ginatus, already noted. It was first obtained the middle of 

 June, but remained common a number of w^eks after collec- 

 tions were terminated in October. 



A single macropterous specimen was included in the col- 

 lection. This Drake informed me, is rarely seen. The folded 

 wings extended beyond the abdomen about half the length of 

 the body, but on one side wings were absent, probably having 

 been torn off before coition. 



NOX-AQUATIC HETEROPTERA. 



Halticus citri Ashm.* (Miridcr). One specimen of this terrestrial 

 bug was found at station 3, an accidental inhabitant of the water. 



Suborder Homoptera. 

 Family Fiilgoridcc. 



Pissonotus brunneus Van. D.f This terrestrial Delphacid 

 w^as merely accidentally present in the water. 



* Identified by Prof. Herbert Osborn. 

 t Identified by Prof. Herbert Osborn. 



