82 BIOLOGICAL sil;\'i;v OF 



NfOTONECTIDAE. The Maek-swiniiners 

 Notonecta Linnaeus 



X. rxinLATA Say. A common and widespread species of vari- 

 ous shades. Station F137 was very productive. 



X. nntoRATA Uhler. Penikese; Station F212, July 25-31. 

 Scarce. 



Nepidae. The Water Scorpions 

 Ranatra Fabricius 



R. fusca Pal.-Beauv. (americana Mont.). In various small 

 ponds where there is plenty of vegetation. Pond near Town 

 Hill; Stations F168 and F212. 



Belostomatidae. The Giant Water-bugs 

 Lethocerus Mayr 



L. American rs (Leidy). This species is in all of the swampy 

 ponds on the Island to a limited extent. They may be taken 

 in a minnow trap. Nymphs and adults appear at the same 

 times. 



Belostoma Latreille 



B. flumineum Say. But one specimen of this species has 

 been taken and that a nymph at Station F386. 



Corixidae. The Water-boatman 



Arctocorixa Wallengren 



A. decorotella Hungf. S. W. Harbor, July 14-18. 



A. conocephala Hungf. S. W. Harbor, July 15. 



A. vulgaris Hungf. Salisbury Cove, Aug. 10. 



A. skhiata Abbott. Salisbury Cove, Aug. 11. 



A. xitida var. minor Abbott. Salisbury Cove, July 18- Aug. 

 10. 



A. macropala Hungf. S. W. Harbor, June 18. 



A. [NTERRUPTA (Say). Bar Harbor; Salisbury Cove; Sta- 

 tions F129 and F137, June 14-Aug. 10. 



