hungerford: aquatic hemiptera. 175 



in the female; the disc in the male with two broad elongate depressions 

 towards the middle and a very large subtriangular depression on each 

 side, these latter almost enclosing an oblique oval elevation behind; 

 the spaces between the depressions appearing raised and forming three 

 longitudinal ridges. Legs stout, the four anterior tibi£e much widened, 

 the anterior pair in the male angularly dilated on the lower edge at the 

 base beneath, and also wider than in the female. 



"Length 7.5 to 9; breadth 2.25 to 2.5 mm." 



Localities: Florida, New Mexico and California. 



Buenoa albida Champion 1901. 



Biologia Centrali Americana, vol. 2, p. 373, 1901. 



"Elongate, narrow, rather slender, smooth, shining; sordid white, the 

 scutellum more or less rufo-testaceous, the legs, antennte, and under sur- 

 face pale testaceous ; the abdomen above testaceous, with transverse black 

 bands, beneath black, with the median carina and some marks on the 

 connexival segments pale testaceous. Head (with the eyes) narrower 

 than the pronotum in both sexes; interocular space about twice as wide 

 on the vertex as at the base, the vertex sulcate down the middle. Pro- 

 notum (along the median line) about as long as the scutellum; the disc 

 in the male with two elongate deep depressions towards the middle and 

 a very large subtriangular shallow depression on each side, thus appear- 

 ing tricarinate in this sex. Legs rather slender; the anterior tibiae in 

 the male angularly dilated on the lower edge at the base, and also con- 

 siderablv widened. 



"Length 6.5, breadth, 1.875 mm." 



Localities: Texas, (Mexico). 



Buenoa margaritacea Bueno 1908. 



G W. Kirkaldy, in his "Uber Notonectiden," gives a short descrip- 

 tion in German of a species measuring 6.7 to 8.1 mm. in length and 2 to 

 2.3 mm. broad, which he says is the commonest North American species. 

 The following is his description of this bug which he considered to be 

 Buenoa platy,cnemis (Fieber) 1852: 



"Ventral carina pale. Pronotum of male and female not, or not 

 clearly, carinated. Hind femur with some 100 bristles. Front tibia as 

 long as the tarsus and claws together, first tarsal segment a half longer 

 than the second, this twice as long as the somewhat pointed finger-shaped 

 claw. Middle tibia a little longer than the tarsus, first tarsal segment 

 tvnce as long as the second, which is double as long as the talon-shaped 

 claws." 



Bueno, in Journ. N. Y. Ent. Soc. X, p. 236, also describes this bug 

 under Anisops platycnemis but subsequently (1909, Journ. N. Y. Ent. 

 Soc, XVII, pp. lA-11) recognizes it as a new species, to which he gives 

 the name Buenoa margaritacea. 



Bueno in Jl. N. Y. Ent. Soc, vol. X, gives the following: 



"Head rather large, with prominent eyes, notocephalic lateral mar- 

 gins slightly diverging from synthlipsis and again converging toward 

 the vertex; to the naked eye, the notocephalon appears of equal width 

 throughout. Pronotum overlapping base of head somewhat pointedly, 

 and terminating in a point at the meeting of the hemelytra. Metanotum 

 completely covered by the hemelytra. Hemelytra pearly, histrous, vary- 

 ing in color when closed from pure white through a bluish to a blackish 

 tinge; in this respect resembling strongly the shadings of mother-of- 

 pearl. Alar nervures pale; alse hyaline. Abdominis dorsum, varying 



