360 HETEROMERA. 
viewed laterally this joint appears to be very obliquely truncate at the apex, owing to 
the deep apical emargination. In one species, R. rev, the anterior coxe (and the 
middle coxe also to a less extent) havea hairy process on the inner side towards the base. 
The abdomen in the European R. subdipterus differs in colour in the two sexes; in 
R. tuberculatus and R. niger, however, the only species of which we possess males and 
females, there is little or no variation in this respect. 
* First joint of the hind tarsi short, stout, strongly compressed, very deeply emarginate 
at the apex ; vertex transversely, convexly raised, not tuberculate in the middle. 
1. Rhipidophorus rex. (Tab. XVI. figg. 19, ¢ ; 194, hind tarsus.) 
3. Very broad, black, rather coarsely pubescent ; the elytra, except the extreme base, the ventral surface of 
the abdomen, except the apex of each segment narrowly, the last two dorsal segments, and the legs, except 
the knees very narrowly, flavo-testaceous; the antennz luteous, with the tips of the rami slightly infus- 
cate. Head finely, closely, and irregularly punctured ; the vertex transversely and convexly raised in the 
middle, and with erect yellowish hairs; antenne with the rami long and very stout ; prothorax with an 
impressed median line and a transverse irregular groove across the disc before the middle, the surface very 
uneven, finely and closely punctured, the disc almost impunctate anteriorly ; elytra deeply sinuate- 
emarginate on their inner edge, shining, with a few very fine scattered punctures along the sides and at 
the apex, for the rest smooth ; abdomen above and beneath (the first segment excepted) very sparsely and 
minutely punctured, the dorsal segments (the first excepted) with a very sharply raised carina down the 
middle; legs stout, comparatively short, the four hinder tibiee moderately compressed, the middle tibie 
irregularly and rather coarsely serrate on their outer edge; the first joint of the hind tarsi only a little 
longer than the apical joint, very stout, strongly compressed and much raised, very deeply emarginate at 
the apex above, the second and third joints short; anterior coxe with a stout hairy process on the inner 
side, the middle coxee with a short and much smaller one; wings hyaline, with a dark fascia beyond the 
middle extending halfway across, the costa from about the basal third piceous. 
Length 10 millim. | 
Hab. Mexico (coll. Godman & Salvin). 
One male example. This is perhaps the finest species of the genus yet described. 
The antenne (including the rami) and legs are very stout. The dorsal segments 
of the abdomen (the first excepted) are very sharply carinate down the middle. The 
anterior coxe have a stout hairy process on the inner side, this process being of the 
same yellow colour as the femur, while the coxa itself is black. The first joint of the 
hind tarsi is very much compressed and raised, the apex (viewed laterally) very 
oblique. 
2. Rhipidophorus levicollis. (Tab. XVI. fig. 20, 2.) 
Q. Black, the head thickly, the under surface (the venter excepted) sparsely pubescent; the elytra entirely, 
and the abdomen above and beneath, the last segment excepted, reddish-yellow ; the antenne entirely 
black; the four anterior legs, the extreme base of the femora excepted, and the spurs and claws of the 
hind legs, reddish-yellow, the rest of the hind pair in great part piceous. Head finely and somewhat 
thickly punctured, the front concave and very uneven; the vertex broadly, transversely swollen, almost 
smooth; antenn comparatively long, the rami unequal in length—very elongate towards the base, much 
shorter towards the apex ; prothorax obsoletely canaliculate in its median third, smooth, except for some 
