THE CANADIAN ENTOMOLOGIST 239 



V 



Macrotylus sexguttatus (FroysLncher). 



Mass.— Lexin^on, 25 June '20 {G. JV. Barber). 



GERRIDAE. 

 G'jrris jiiarginatus Say. 



Vt.— Woodford. 5 Sept. '19 {H.M.P.). 

 Rheumatobates rileyi Bergroth. 



Mass.— Northampton, 22 Aug. '19 (H.M.P.). 



VT.—Woodford. 5 Sept. '19 (H.M.P.). 



VELIIDAE. 

 Microvelia buenoi Drake. 



Bull. Brooklyn Ent. Soc, XV :20, 1920. ,^ 



Me.— Orono, 3 May '14 (H.M.P.). 



Mass.— Northampton, 22 April '21 (H.M.P.) ; Saugus, 27 August '17 



(H.M-P.). 



This minute species, recently described from the Adirondacks, has just 

 been found in large numbers in a small campus pond, where no Microvelia has 

 previously occurred. Nymphal and adult stages were present. It may be readily 

 distinguished from the equally small M. borealis Torre-Bueno by its shorter and 

 thicker third antennal segment, which is clavate, not linear, the straight posterior 

 tibiae in the male, and the conspicuous tufts of long silvery pubescence which 

 ornament the abdomen in the apterous form. The Maine record in the List, page 

 108, pertains to M. biicnoi. not to M. borealis, according to material now in my 

 collection. 

 Microvelia liinei Drake. 



Ohio lour. Sci. XX:207, 1920. 



Mass.— Northampton, 22 June '21, 3 Oct. '21 (H.M.P.). 



In antennal structure this species resembles the preceding, biit it is still 

 smaller, shows little sexual dimorphism, and in the apterous condition is very 

 brightly colored, though without dorsal silvery pubescence on the abdomen. .^ 

 Microvelia albonotata Champion. 



Mass.— Northampton 22 June '21 (H.M.P.). 



HEBRIDAE. 

 Hcbrus burmeisteri Lethierry & Severin. 



Mass.— Northampton, 22 June '21 (H.M.P.). 



I am not certain of the proper application of the names, H. burmeisteri 

 and H. concinnus Uhl., and they may be synonymous as the published distribution 

 would seem to indicate ; or itjs possible that concinnus is in reality a West 

 Indian species, distinct from the one common in the eastern United States. At 

 any rate I have found but one form in the latter region. 



MciTagata foveata Drake. 



Ohio Jour. Sci., XVII :103, 1917. 



Mass.— Sunderland. Mt. Toby, 28 May '21 (Priscilla Butler). . . 



BELOSTOMATIDAE. 

 Lethocerus americanus (Leidy). 



Mass.— Northampton. 7 Oct. '19 (H.M.P.). 



Covered with a bright green alga, which changed to gray in drying. 

 Lethocerus obscurus (Dufour). 



MASS.^Northampton. 26 Sept. '19 (H.MP.). 



