3 82 
The Ohio Naturalist. 
[Vol. VIII, No. 8, 
not far from the base. Middle coxae in the cT 'much thicker 
than the hind coxae, trochantera convex and thicker than the 
linear hind trochantera, femora hairless, slightly curved, incras- 
sated towards the base, on the inner side with a spine a little 
before the apex and a short spur just by the apex, tibiae very 
strongly curved at the base with a tuft of short hairs on the inner 
side of the end of the curve, between which point and the apex 
the tibiae are straight and fringed with rather short straight 
hairs on the outer side of the middle part. Hind legs in both 
sexes simple, straight and hairless. praeposterus Bergr. 
The genital segments show much the same structure in all the 
species. 
The following are the salient characters of the macropterous 
form as represented by two winged specimens (cJ 1 $) of Rh. ten- 
uipes in my collection: Pronotum prolonged backward, cover¬ 
ing the mesonotum, the posthumeral part forming a subtriangular 
process’ with slightly’ rounded sides and rounded apex; a blunt 
transversal keel between the humeri but not reaching them and 
a median longitudinal impression between this keel and the pale 
apical spot; an impressed line inside the lateral and posterior 
margins. Seutellum half-concealed under the posterior end of 
the pronotal process, blunt and callous at apex. Hemelytra very 
much longer (cT) or moderately longer (9) than the abdomen; 
corium membranous but well separated from the membrane, 
greyish white, with brown veins, costal margin thickened, sub¬ 
costal vein very fine, abbreviated towards the base, in the female 
not discernible or coalescing with the costa, discal vein furcate 
at apex, the short outer branch joining the costa a little before 
its apex, the long inner branch running straight to the inner 
apical angle joining the base of the inner vein of the membrane, 
apical margin a little oblique, the outer apical angle slightly 
obtuse, the inner slightly acute; clavus narrow but distinct 
throughout its length, grey’ish white with a short brown basal 
vein barely passing the apex of the seutellum; membrane dis¬ 
tinctly (cT) or slightly ( 9 ) longer than the corium, smoky, with 
an outer and inner vein forming a loop and a median fold-like 
greyish white vein. Wings considerably (cT) or a little (9) 
longer than the abdomen, shorter than the hemelytra, smoky, 
the veins arranged and colored as in the membrane. 
The veins of the corium are thus arranged much on the same 
plan as in the genus Trepobates and those of the membrane are 
practically'’ identical in the two genera and very different from 
the veins in the subfamily Gerrinae. 
I have not seen the winged form of Rh. Rileyi; a figure of it is 
given as a frontispiece to the last parts of the Proc. Ent. Soc., 
Washington. 
What Uhler describes as the “narrow, almost linear corium” 
in the winged form of Rh. imitator is evidently not the -whole 
corium, but only the space between the discal vein and -the 
costa. 
