No. 34-] HEMIPTERA OF CONNECTICUT: NOTONECTIDAE. 405 



4. Distance between eyes at front, not more than three times their 



distance at vertex ; pronotum twice as wide as long 5 



Distance between eyes at front, six to eight times their distance at 

 vertex ; slender ; scarlet and black ; size 10-12 mm uhleri 



5. Distance between eyes at front, three times their distance at vertex ; 



irrorated black and brown, variable ; size, 12-14.5 mm irrorata 



Distance between eyes at front nearly equal to their distance at 

 vertex ; fuscous, greenish-white, or testaceous with more or less 

 black ; size, 12.6-15.5 mm insulata 



N. undulata Say. 



Heter. N. Harm., 39, 1832; Compl. Writ, i, 368, 1859. 



This is by far the most widely spread species in America, and 

 ranges from British Columbia to Chile. Small white specimens 

 may sometimes be confused with variabilis or raleighi, but the 

 latter are easily recognized by the head structure and their greater 

 slimness. The species varies in color from pure white to black. 

 Its color variations have given rise to a lengthy synonymy not 

 mentioned. According to Hungerf ord, this species has five stages 

 of nymphal development, which take about forty days from the 

 tgg to the mature insect. 



Southington, 21 May, Hamden, 24 Oct., 1910 (B. H. W.) ; Cromwell, 9 

 Apr., 1919 (M. P. Z.) ; Kent, 10 Aug., 1918 (M. P. Z.) ; New Canaan, 17 

 Sept., 1918 (B. H. W.). 



N. variabilis Fieber. (PI. xvi, 5.) 



Abh. Bohm. Ges. Wiss. (5) vii, 477, 1851. 



{undulata Uhler. Stand. Nat. Hist. Vol. ii, 252, 1885 (in part) ; ameri- 

 cana Ashmead. Ins. N. J., 144, 1899.) 



This small species is readily separated from A^ undulata on the 

 characters given in the table. Nothing is known about its life 

 history except the ^gg and the embryonal period. 



New Haven, 16 May, 1904 (W. E. B.) ; 22 Aug., 1904 (P. L. B.) ; 

 Hartford, 13 Aug., 1904 (H. L. V.) ; Hamden, 24 Oct., 1910 (B. H. W.), 

 18 May, 1919 (M. P. Z.) ; Colebrook, 19 June (P. G.) ; Guilford, 13 July, 

 1920 (P. G.). 

 N. raleighi Bueno. 



Can, Ent, Vol. xxxix, 225, 1907. 



{variabilis (Fieber), Bueno, in part, in various papers prior to 

 this date). 



This species very much resembles a dwarf variabilis but is easily 

 distinguishable by the structure of the head. So far it is known 

 from New Jersey south, but it should be found in Connecticut. 

 N. uhleri Kirkaldy. 



Ann. Mag. Nat Hist. (6) xx, 58, 1897. 



Its bright scarlet and black color make this the most striking of 

 our local species. The head also is so distinctive that there is no 

 danger that it may be confused with any other. It is rather rare, 

 although on the occasions it has been taken it v/as comparatively 

 abundant. 



