RHAGOVELIA. 133 
1. Rhagovelia crassipes, n. sp. (Tab. VIII. figg. 20, apterous ¢, from 
beneath ; 21, apterous @.) 
Winged form. Elongate, robust, brownish-black, the front of the head and the posterior margin of the 
pronotum, and sometimes a narrow evanescent median line on the disc of the latter anteriorly, obscure 
ferruginous ; the pronotum with a transverse fulvous fascia in front, this becoming whitish at the sides ; 
the venter, except at the sides, and the conuexival margins fulvous; the pleura and sides of the venter 
bluish-grey ; the antenn nigro-fuscous, testaceous at the base; the legs fuscous or nigro-fuscous, much 
paler beneath, the trochanters and coxee, and the base of the anterior and hind femora testaceous; the 
elytra blackish-brown, with black nervures ; the entire body, legs, and antenne clothed with short, fine, 
brownish or pallid pubescence, the head, pronotum, and sides of the body sparsely, the legs, and joints 1-3 
of the antenne thickly, clothed also with long hairs, the legs and joints 1 and 2 of the antennez with 
scattered sete. Head with a smooth impressed median line; antenne moderately long, joint 1 rather 
more than one-half longer than 2, 3 a little shorter than 2, 4 shorter than 3, pointed at the tip. Pro- 
notum produced behind into a long, raised, spiniform process, which is armed beneath at some distance 
before the tip with a stout tooth; the surface impressed with a few scattered punctures, Elytra extending 
to some little distance beyond the apex of the abdomen, the nervures prominent. Legs stout, the hind 
pair comparatively clongate ; intermediate tarsi with joint 2 slightly shorter than 3. 
dS. Posterior femora enormously incrassated, armed with numerous short teeth, the innermost of these arranged 
in two regular rows, and with one longer tooth towards the base and three or four others towards the 
apex; posterior tibia bowed inwards to beyond the middle and curved outwards thence to the apex, 
shortly denticulate on their inner edge, and armed with one long tooth at about one-third from the apex, 
a shorter one close to it, one near the apex, and another at the apical angle; posterior coxe and 
trochanters very stout, the coxe rather narrowly separated, the trochanters obsoletely denticulate beneath. 
Metasternum with a smooth, rufous, tuberculiform prominence in the middle behind. Ventral segments 
1-3 keeled down the centre. Sixth ventral segment arcuate-emarginate at the apex, the sides of this 
segment, like those of the genital segments, thickly clothed with bristly hairs. Sixth dorsal segment 
truncate at the apex. 
Q. Posterior femora moderately incrassate, slightly hollowed on the inner side towards the apex, armed with 
numerous short teeth, which extend from the middle to the apex, and with one long slightly curved tooth 
a little before the middle ; posterior tibie straight, shortly denticulate within, and with a short straight 
tooth at the apical angle ; posterior coxe widely separated. Sixth dorsal segment rounded at the apex. 
Length 6-7, breadth (of the pronotum) 23-2? millim. 
Apterous form. Fusiform, the pronotum abbreviated and rounded behind, the sutures and the sides of the 
dorsal abdominal segments grey or bluish-grey, the latter inclining to ferruginous down the centre. 
Hab. Panama, Tolé and Pefia Blanca (Champion). 
Found in plenty on the surface of the rivers draining the Pacific slope. Five only 
of the specimens are winged. ‘This species is well characterized by the enormously 
thickened hind femora and the bowed hind tibie in the male sex, both femora and 
tibie being armed with numerous teeth. The hind femora of the female are formed 
somewhat as in the male of &. armata. The oblique ridge on each side of the meso- 
sternum, extending from the intermediate to the anterior coxe, is very prominent. In 
one of the apterous males from Tolé the hind legs, the metasternum, and the base of 
the abdomen are formed exactly as in the females: it is probably a monstrosity. 
2. Rhagovelia varipes, n.sp. (Tab. VIII. fig. 22, apterous ¢.) 
Apterous form. 3. Elongate, moderately robust, fusiform, black, the abdomen piceous at the apex above, the 
base of the antennz, the prosternum, the cox, the trochanters (the apex of the intermediate pair 
excepted), the anterior femora with about the basal half above and beneath, the intermediate femora at 
the base beneath, and the posterior femora at the base, beneath, and within, more or less flavous; the 
