RHIPIDOPHORUS. 363: 
Hab. Mexico, Orizaba (Sallé); Guatemata, Duefias (Salvin !), Panzos (Conradt). 
The specimen described by Mr. Waterhouse ! is evidently a female, and we have an 
example from Orizaba agreeing with it. A male from Panzos, from which the above 
description is taken, no doubt belongs to the same species, the head, as in the same 
sex of R. tuberculatus, having a prominent tubercle on the vertex. In the females of | 
both species this tubercle is replaced by an obtuse elevation. ‘The tubercle (or median 
carina) on the vertex in the male is compressed and not nearly so stout as in R. tubercu- 
latus: viewed from behind it appears to be conical. 
6. Rhipidophorus hyalinus. (Tab. XVI. fig. 24, 3.) 
gd. Comparatively narrow, parallel, black, finely pubescent ; the elytra pitchy-brown, with a narrow yellowish 
median fascia; the abdomen entirely piceous; the antennz fuscous-yellow; the legs pitchy-brown, the 
anterior and posterior pairs with the basal half of the tibia and the tarsi in part obscure testaceous. Head 
very broad, closely and finely punctured, the front flattened ; the vertex with a small, compressed, acute 
tubercle in the middle, and numerous long erect hairs; antenne with the rami very long, slender, and 
slightly curled; prothorax closely and finely punctured, with a smooth median line, the disc obliquely 
depressed on either side towards the base, the depression limited anteriorly by a short, oblique, smooth 
ridge ; elytra shining, finely punctured at the base, the apical half smooth; abdomen closely and finely 
punctured, the first two dorsal segments smoother; legs rather slender, the tibie moderately compressed ; 
the first joint of the hind tarsi comparatively slender, elongate, as long as the others united; wings, the 
costa excepted, entirely hyaline, the costa pitchy-brown. 
Length 23 millim. 
Hab. Mexico, Cordova (Sallé). 
One male example. This is much smaller than any of the other species here 
described, and is readily separable from all of them by its hyaline wings. The vertex 
has a short compressed tubercle in the middle. The head is exceedingly broad. ‘The 
rami of the antenne are very slender. . hyalinus agrees in some respects with 
Leconte’s' description (Proc. Acad. Phil. xvii. p. 97) of the North-American &. ye: 
pides (Newm.), but it is evidently distinct from that species. 
++ Vertex not tuberculate in the middle, at least in the female. 
7. Rhipidophorus simplex. (Tab. XVI. fig. 25, 2 .) 
2. Black, finely pubescent; the elytra yellow, with the apex idtinaed with reddish-brown; the abdomen 
above and beneath reddish-yellow, the last dorsal segment in great part, the penultimate segment with a 
broad transverse median patch, and the other dorsal segments with a small median spot, piceous; the 
antenne reddish-yellow, the rami infuscate towards the tip ; the legs reddish-yellow, with the outer half 
of the four anterior tibia and the base of all the femora suffused with piceous. Head finely and thickly 
punctured, with a short angular elevation on either side just beneath the point of insertion of the antenna, 
the front flat; the vertex not raised in the centre, excavate in the middle on its anterior side; antennz 
very short, the rami almost equal in length; prothorax densely and very finely punctured, with a median 
line on its anterior half, an oblique space on either side of it about the middle, and a small spot behind 
this on either side near the base smooth, the posterior half of the disc flattened ; elytra shining, finely and 
somewhat thickly punctured, the apical third much smoother; abdomen above and beneath finely and 
; closely punctured, the last dorsal segment with scattered punctures only ; tibiee moderately compressed ; 
3 AA 2 
