THE BACK-SWIMMERS. 1059 



middle of ventrals, sides of dorsals, inner and outer faces of front femora 

 and coxa? and tarsal claws, blackish-brown. Head of male across eyes 

 slightly wider than pronotum ; vertex widest at middle, where it is two- 

 thirds wider than at base or between front of eyes, in female less nar- 

 rowed between front of eyes. Pronotum in dried specimens of male with 

 vague depressions and a ridge each side; in females and fresh specimens 

 of male, scarcely impressed. Claval orifice very small, about one-fifth 

 the length of scutellum; commissure hirsute, one-third longer than scutel- 

 lum. Males with stridular area of front femur as in key, and fig. 213, h, 

 very distinctive. Length, 6.5 — 7.5 mm. 



Raleigh, N. Car., Sept. 15 — Oct. 16 ; determined by China. 

 Described from Kansas and heretofore recorded only from 

 there. 



1199 (1364). Bueno elegans (Fieber), 1851, 61. 



Elongate, slender, subcuneiform. Above pale straw- or whitish-yel- 

 low; eyes pale brown with scattered darker spots; lower margin of 

 pronotum with a shining black stripe which extends back to middle of 

 costal margin of corium ; elytra usually with apical fourth of corium 

 shining black, and a vague piceous stripe along outer margin of clavus ; 

 sterna and legs dull yellow, the latter often with a fuscous tinge ; ventrals 

 dark brown, the sixth in part paler. Greatest width of vertex more than 

 twice that at narrowest point. Pronotum of male one-fourth longer than 

 scutellum, its disk with a shallow central impression divided by a vague 

 median carina; commissure nearly four times as long as scutellum; 

 female with pronotum scarcely longer than scutellum, its disk with a 

 feeble median carina. Length, 5 — 5.5 mm. 



Clark Junction, Lake Co., Ind., Aug. 7 ; Douglas Co., Kans., 

 November (Gerhard). White Plains, N. Y., Aug. 29 ; Palisades, 

 N. J., Sept. 5 (Davis). Staten Island, N. Y. ; Ft. Lee, N. J., 

 and Raleigh, N. Car. (Brimley) . Dunedin, Fla., Nov. 24 — March 

 10; numerous specimens taken from amongst the grasses and 

 water weeds along the shallow margins of ponds. The first 

 record for the State (Jl\ S. B.) . The known range extends 

 from Maine west to Michigan and Kansas and south to Florida. 

 Most of the specimens received were labelled B. platycnemis 

 Fieb., but they differed only in being of a darker hue, the dis- 

 tinctions given by Bueno (1909, 77) being comparative only, 

 not fixed. The name platycnemis has served as a "catch-all" for 

 undetermined species of the genus since Uhler (1884) used it 

 for the only species he at that time knew. 



1200 ( — ). Buenoa limnocastoris Hungerford, 1923a, 150. 



Differs from elegans mainly by the characters given in key. Dark 

 markings more prominent, there being usually, in addition to those of 



