CYCLONOTUM.—PHANONOTUM. 97 
5. Cyclonotum tibiale. 
Rotundato-ovale, convexum, nitidum, piceo-nigrum, pedibus rufis; antennis, palpis tarsisque testaceis; supra 
crebre punctatum, elytris seriebus punctorum impressis, internis ad basin subtilioribus; tibiis posteri- 
oribus facie inferiore asperato-punctata. 
Long. 23, lat. 1 lin. 
Hab. GUATEMALA. 
A single individual of this insect is the only one I have seen, and although very 
similar to C. centrale I feel no doubt it represents a distinct species; the series of 
punctures on the elytra are not quite so coarse, and the internal ones do not disappear 
altogether from the basal portion, although they are there much finer. The apical 
portion of the lower face of the hind tibia has much more sculpture than the same 
part in C. centrale. 
The specimen has no indication of more special locality than “Guatemala.” 
PHAANONOTUM. 
Corpus hemisphericum, supra glabrum nitidum, subtus subtilissime pubescens, opacum. Antenne novem- 
articulate, articulis tribus ultimis clavam elongatam laxissime articulatam formantibus. Maxille mala 
tenuiora fere membranea. Palpi maxillares sat elongati, graciles, articulo secundo parum incrassato ; 
labiales hirsuti. Prosternum brevissimum. Metasternum anterius in medio carinato-elevatum, inter 
coxas intermedias longe productum, mesosterni parti elevate minute arcte conjunctum. ‘Tarsi omnes 
quinquearticulati, intermedii et posteriores articulo basali quam sequens longiore, plus minusve incrassati. 
Elytra punctata sine stria suturali. 
This genus is allied to Cyclonotum, but the structure of the middle parts of the 
meso- and metasterna present constant and well-marked distinctions; the metasternum 
is greatly produced in front and strongly elevated, and with this part the small central 
elevation of the mesosternum is closely combined; thus by the two pieces a small 
linear lamina is formed in front of the middle coxe, simulating, in fact, the linear piece 
seen in Cercyon, from which, however, it is entirely different, this part in Cercyon being 
formed exclusively by the mesosternum, whereas in Phenonotwm it is in larger part 
formed by the metasternum. In Cyclonotum this part of the mesosternum forms a 
broad angular piece, the front of which is very strongly margined on each side, while 
the posterior portion is more or less prolonged backwards to join the metasternal 
process. Phenonotum, moreover, has the middle pieces of the prosternum much shorter 
than in Cyclonotum, the parts of the mouth are more feeble, and the elytra are destitute 
of a sutural stria. 
The genus is probably characteristic of the warmer portions of the New World, 
although the only species hitherto known (fydrophilus estriatus, Say) is found in the 
southern portions of the United States of North America; but I am acquainted with 
several species found in the Amazon valley by Professor Trail. 
BIOL. CENTR.-AMER., Coleopt., Vol. I. Pt. 2, December 1882. 00 
