HUNGERFORD: AQUATIC HEMIPTERA. Zales 
peatetry and strigil dextral; fifth tergite entire, sixth divided.”— 
ott. 
The above description is taken from Can. Ent. for April, 1913. This 
is a revision of the original generic diagnosis. To date there have been 
described two species separated by the following table. 
KEY TO SPECIES. 
A. General facies dark. Tegminal lineations complete. Front femur 
of female oblong, 2% times as long as wide. Palar pegs of male 
24-33* in crowded row the length of pala. P. buenoi Abb. 
AA. General facies light. Tegminal lineations incomplete. Front femur 
of female trapezoidal, two-thirds as wide as long. Palar pegs of 
male in two rows confined to base of pala. P. gillettii Abb. 
Palmacorixa buenoi Abbott. 
Can. Ent., Apr. 1913. 
“Similar to P gillettei in size and appearance, in the flattened short 
pronotum, and large head, with prominent posterior angles. Dark yellow 
to smoky brown, and much darker than gillettei. The tegminal lineations 
are complete, more or less inosculated and confused, but without a marked 
tendency to longitudinal seriation. Lineations of clavus complete, i. e., 
not effaced on the inner anterior area as in gillettei. Head smoky brown; 
its length 1% in the width of the male, 2% in the female; interorbital 
width twice in the head length in the male, 14% in the female. Male fovea 
more prominent than in gillettei, reaching the middle of the eye, and 
clothed with delicate depressed hairs. Pronotum flattened, margined, 
lenticular in outline, evenly rounded posteriorly, dull and minutely 
rastrate, with % approximately parallel lineations, which are more or less 
broken, the lineations about as wide as the yellow interspaces. Posterior 
margin brown. Claval lineations delicate, vermiculate and inosculate, 
covering the whole clavus, fused externally to form a more or less definite 
oblique line parallel to the corio-claval suture. Clavus rather infuscated 
and clouded across the middle third. Markings of corium similar to 
those of clavus, running without interruption over the membrane; inoscu- . 
lated, but scarcely interrupted, sometimes fused into one or two rather 
indefinite longitudinal lines, which do not extend beyond the embolium. 
Surface of clavus and corium rather dull and rough, the clavus usually 
rastrate, the corium merely punctate. Margins of embolium and of 
clavus elevated. Lower surface and legs pale; posterior tibia fringed 
with brown hairs. Metaxyphus very short, acuminate. Strigil rounded, 
_5 striae, diameter 0.1 mm. 
“Male pale cultrate, somewhat produced at the base, the length three 
times the greatest height. Pegs blunt, elongate, 24-33 in number. The 
distal ones are somewhat longer and crowded, and may be displaced into 
two irregular rows. The main row begins midway the base and rises in 
a curve after the first half dozen pegs; then follows the upper margin, but 
at some distance from it. A ‘second row of peg-like spines along the 
lower margin, about 1% to 2 times the length of the pegs. Tibia sub- 
globular, about as high as the pala. Femur oblong, a little less than 
twice as long as wide, the stridular area covering the proximal half and 
consisting of short spines set in transverse rows. Female pale cultrate, 
not produced at base, slightly more than three times as long as wide, 
broadly joined to the tibia. Tibia rounded oblong, tapered proximally, 
twice as long as high. Femur oblong, 2% times as long as wide (the 
width at base in P gillettei is two-thirds the length) with stridular 
-spines* on the surface as in P. gillettei. Second leg, Femur 2% times 
* Number of pegs exceeds this in one series examined by the writer. 
* Through a lapsus calami these are called ‘‘spines” in the description of P. gillettii 
ial. ¢., p. 329). 
a 
