310 RHYNCHOPHORA. 
the base, though the ventral segments are smoother along the middle in one of them. 
Extremely like C. canescens, but with the elytra less widened at the base and with 
more numerous elevations, the scutellum shorter, the rostrum smoother and not so 
stout (¢), the anterior coxee more widely separated, the tibie without a long hook 
near the outer apical angle, the scales on the upper and under surfaces less rounded. 
41. Cholus fusiformis, sp.n. (Tab. XVI. figg. 20, 20a, 0, 3.) 
Elongate, narrow, somewhat fusiform, black, shining; here and there densely clothed with patches of long 
piliform, ochreous scales, which tend to form two vitte on the head, these becoming united in front and 
extending along the rostrum, an interrupted vitta on each side of the disc of the prothorax, and two 
oblique vitte on the posterior half of the elytra and some scattered spots towards their base, the vestiture 
beneath mainly concentrated at the sides and along the middle. Head densely, rugulosely punctate ; 
rostrum about as long as the prothorax, stout, abruptly declivous above from opposite the points of 
insertion of the antennsw, widened towards the base and apex, shallowly sulcate, and densely, rugulosely 
punctate to about the middle, and very sparsely punctate thence to the tip, obsoletely carinate at the base 
only, the lower surface quite smooth; antennal club nearly as long as joints 2-7 of the funiculus united. 
Prothorax a little broader than long, subconical, the sides slightly rounded at the middle, the ocular lobes 
distinct ; closely, minutely punctate and feebly granulate, the disc with an almost obsolete median channel, 
which becomes wider and deeper at the base, and also grooved laterally. Scutellum rounded. LElytra 
considerably wider than the prothorax, elongato-cordate, the scutellar region depressed, the basal margin 
raised; rather coarsely seriate-punctate, the interstices very minutely punctate. Beneath closely, very 
finely punctate ; the first two ventral segments deeply excavate down the middle. Anterior coxe rather 
narrowly separated. Mesosternum flattened between the coxe. Legs long; femora each with an acute 
tooth ; tibie shortly and bluntly mucronate at the inner apical angle, the outer angle unarmed. 
Length 14, breadth 5 millim. (¢.) 
Hab. Costa Rica, Rio Sucio (Rogers). 
One specimen, somewhat abraded above. An aberrant form that may have to be 
separated from Cholus. The tooth at the inner apical angle of the tibie is short and 
blunt, and the hook at the outer angle is absent. The antennal club is long, and the 
rostrum is peculiarly shaped. 
ERETHISTES. 
Erethistes, Pascoe, Journ. Linn. Soc., Zool. xi. p. 471 (1878). 
The species referred to this genus agree with Peridereus, Schonh., and Kangoropus, 
Chevr.*, in having the posterior femora extending beyond the apex of the abdomen ft. 
They have the ocular lobes of the prothorax obsolete or feebly developed, and the 
tibiz either furnished with a short claw or unarmed at the outer apical angle. It is 
doubtful if Erethistes can be maintained as distinct from Periderewus, the armature 
of the tibie, as in Cholus, varying in development according to the species. The 
characters of Kangoropus (in which Chevrolat includes Sclerosomus granulosus, Fahr.) 
are not very obvious from the description. 
* Bull. Soc. Ent. Fr. 1878, p. exxvi. 
+ This character is not shown in our figures, owing to the foreshortening of the legs. 
