PHANOCERUS.—CYLL@PUS. 129 
antenne, the last six joints of which are formed into a compact oval club this club 
is flattened or compressed, so that viewed in one direction it appears rather broad, but in 
the opposite direction looks slender. The prosternum is not provided with any well- 
marked chin-piece; nevertheless the front coxe are not placed quite at its anterior 
edge, and are comparatively but little separated, the prosternum being produced between 
them into an elongate slender process, which is received into a rather large depression 
of the mesosternum ; the latter in the middle is not separated by any distinct depres- 
sion from the metasternum. 
The genus should be placed after Potamophilus as the last of that group of genera. 
The Australian Lutrochus australis, King, is allied to it, and should probably be 
formed into an allied genus distinct from Lutrochus. This latter genus (from South 
America) has, according to Erichson, a similar structure of the antenne, but in other 
respects it appears allied to Byrrhomorphus rather to Phanocerus. 
1. Phanocerus clavicornis. (Tab. IV. fig. 8.) 
Parum elongatus, fuscus, pube brevi depressa densissime vestitus ; antennis pedibusque sordide testaceis, illarum 
clava fusca; prothorace elytris angustiore, antrorsum angustato, margine laterali parum distincto ; elytris 
vix striatis, parum profunde seriatim punctatis. 
Long. 14, lat. 4 lin. 
Hab. GuatemMata, Coban (Champion). 
Basal joints of antenne with conspicuous, rather long pubescence. Eye very little 
prominent. Thorax at the base much narrower than the elytra, very convex trans- 
versely, with an indistinct curved impression marking off the basal portion of the side: 
punctuation quite invisible. Elytra covered with dense fine tomentum concealing 
their sculpture, which consists of rather indistinct strie, marked with shallow rather 
large and distant punctures. Undersurface very densely clothed with a fine pale 
pile. 
The series of half-a-dozen individuals shows no sexual distinction ; all have the apices 
of the elytra quite simple. 
Subfam. ELMINT. 
CYLLGEPUS. 
Cyllepus, Krichson, Ins. Deutsch. iii. p. 521 (note). 
This genus was established for a Peruvian species which has hitherto remained with- 
out congener. 
1. Cyllepus optatus. (Tab. IV. fig. 9.) 
Elongatus, subparallelus, niger, opacus, antennarum basi sordide rufa; prothorace elongato, canaliculato, 
BIOL. CENTR.-AMER., Coleopt., Vol. I. Pt. 2, December 1882. SS 
