THE BACK-SWIMMERS. 1055 



1194 (1350). Notonecta uhleri Kirkaldy, 1897a, 58. 



Elongate, subcuneiform. Head, except eyes, pronotum, beak, except 

 tip, and legs dull greenish-yellow; scutellum, under surface in great part 

 and tip of beak black; elytra dark reddish-brown (crimson or orange 

 when fresh) with outer basal angle, a large spot on apical third and 

 tip of corium blackish; eyes brown; membrane reddish-brown, its apical 

 half darker; connexivals each with a yellow spot beneath. Interocular 

 area at vertex very narrow, the large eyes at that point almost con- 

 tiguous. Pronotum one and four-fifths times wider than long; humeral 

 angles prolonged somewhat downward, subacute; side margins sinuate; 

 hind one, except near humeral angles, truncate. Length, 10.7 — 11.5 mm. 



Dunedin, Fla., Dec. 27; one specimen from the mouth of a 

 ditch emptying into a muck-rimmed pond (W. S. B.). Staten 

 Island, N. Y., and Hyattsville, Md., August (Davis). Raleigh 

 and Boardman, N. Car., Sept. 21 — Nov. 21 (Brimley). The re- 

 corded range of this handsome and scarce species extends from 

 Massachusetts southwestward to Florida and Louisiana, the 

 only other known Florida specimen being in the Uhler collec- 

 tion without definite station. Known also from Olive Branch, 

 southern Illinois, where Gerhard (Ms.) took ten specimens in 

 September, 1909. Its habits, as far as known, are the same as 

 those of irrorata. The very narrow basal portion of vertex and 

 peculiar color easily separate it from our other eastern species. 



1195 (1354). Notonecta raleighi Bueno, 1907b, 225. 



Oblong, robust, subcuneiform. Above usually a nearly uniform 

 greenish-yellow, rather thickly pubescent with appressed yellow hairs ; 

 eyes dark reddish-brown ; basal half of pronotum, scutellum and clavus 

 often blackish by transmission of hues of the dark under parts through 

 the subhyaline texture; corium sometimes with an interrupted sub- 

 marginal stripe and the apical fifth fuscous-brown; sides of prosternum, 

 beak, except tip, and legs dull yellow; coxas and connexivals beneath 

 greenish-yellow; remainder of undersurface dark brown. Interocular 

 area at vertex narrow, only about one-fourth the width of base of eyes. 

 Pronotum two-thirds broader than long, side margins feebly concave, 

 hind one broadly, very feebly curved. Scutellum one-fourth wider than 

 long, its sides sinuate. Length, 8 — 9 mm. 



Wolf Lake, Ind., Oct. 24; New Lenox, 111., July 5 (Gerhard). 

 Hyattsville, Md., Aug. 23 (Davis). Raleigh and Kipling, N. 

 Car., November — December (Brimley). Ranges from New Jer- 

 sey west to northern Illinois and southwest to North Carolina. 

 Allied to variabilis, from which it is readily separated by the 

 more robust form and much narrower interocular area at base 

 of eyes. 



