186 



R quadridentata, Stal. 



A larger and paler species, three individuals of which have 

 occurred to me in fifteen years collecting here. One was taken 

 amona: rubbish in Cayuga Creek at Lancaster, another on 

 aquatic weeds at "the Bay" at the upper end of Squaw Isd. 

 Niagara River, in Sept. 1886; the third was picked up on the 

 sand at Fort Erie Beach, July 9th, 1893, after a storm. 



NOTONECTA, Linn. 



192. N. insulata, Kirby. 



Taken in ponds at Buffalo Plains, in July. It is not uncom- 

 mon everywhere in stagnant pools, where there is a clayey 

 bottom and the water does not entirely dry away in summer. 



193. N. undulata, Say. 



This is a smaller and more abundant species than the preced- 

 ing with which it may be found through July and August. It 

 is very variable in the extent of its dark markings. 



(.. N. irrorata, Uhler. 



Not infrequent in stagnant muddy pools with insulata and 

 undulata. July. 



FAMILY COKISID.K. 



CORISA, Groff. 



195. C. alternata, Say. 



Common in Niagara River and in most of the creeks about 

 Buffalo. July and August. 



196. C. Harrisii, Uhler. 



Quite abundant in a pond at Ridgeway, Ont. in Aug. 1886. 



197. C. - 



Excessively abundant in the waters of Lake Erie, Niagara 

 River and especially in the Harbor at Black Rock, in Sept. 

 Also common in many ponds and small streams. I have seen 

 this species flying in swarms along the White's Corner's plank- 

 road at South Buffalo about dusk in the evening. 



Suborder Homoptera. 

 FAMILY CICADIDJ-:. 



CICADA, Linn. 

 198. C. canicularis, Harris 



The shrill note of this common Harvest-fly, often called "the 

 Locust," is a familiar sound through the heat of the day in July 

 and August. Though most abundant about open sunny woods 

 they are frequently heard in our shaded city streets and at the 

 Park where the empty pupa-cases may often be found clinging 

 to the bark of the trees. 

 y.'<\v.:—Tibicen rimosa, Say, should occur here and I once found at 

 North Collins an empty pupa-case quite different from that of 

 canicularis, and a Cicada's note, strange to me, was heard at 

 the same locality so I have little doubt but this species inhabits 

 the hills of N. Collins and probably elsewhere in our district. 



