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 tibize 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. 
“leneth: 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 
- seutellum more or less rufo-testaceous, the legs, antennz, 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 suleate 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 tibiz in 
the male angularly dilated on the lower edge at the base, and also con- 
_ siderably 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 platycnemis (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 
twice as long as the second, which is double as long as the talon-shaped 
claws.’ 
3 Bueno, in Journ. N. Y. Ent. Soc. X, p. 236, also describes this bug 
_ under Anisops platycnemis but subsequently (1909, Journ. N. Y. Ent. 
7 Soc., XVII, pp. 74-77) 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: 
1/9 We 
“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; ale hyaline. Abdominis dorsum, varying 
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