164 HETEROMERA. 
Cordova, Tuxtla (Sailé), Esperanza, Jalapa(Hége); Britisu Honpuras, Belize, R. Hondo, 
R. Sarstoon (Blancaneaux); GuatEmata, Chinautla (Salvin), Capetillo, Cerro Zunil, Las 
Mercedes, Zapote, El Tumbador, San Gerénimo, Cubilguitz (Champion), Yzabal (SaJ/é). 
— ANTILLES 1, Cuba ?. 
A common species in Mexico and Guatemala. Smaller, narrower, and more parallel 
than U. bi-impressa ; the thorax broader in front, invariably with numerous additional 
scattered very coarse punctures upon the disc; the under surface smoother (the flanks 
of the thorax especially) and more shining. Well-developed males have three long 
thin porrect horns upon the head: in the long series of upwards of one hundred speci- 
mens before me every degree of development from acute tubercles to long horns is to be 
found; the frontal horn in this species is always as long as the hinder ones. This 
species also varies very considerably in size. 
A small undeveloped male from Jalapa differs from the other specimens in having the 
thorax punctured as in U. depressa and the striz of the elytra more shallowly and finely 
punctate-striate ; it is doubtfully referred to this species. 
2. Ulosonia canaliculata. 
Form of U. tricornis; the male cephalic armature as in poorly developed specimens of that species, and 
differing as follows :—The prothorax smoother, the surface with exceedingly minute scattered punctures, 
the large coarse punctures almost entirely obsolete (rarely with at most two or three impressions on the 
disc), the disc with a short deep longitudinal groove at the base and (in one specimen) longitudinally 
depressed from the middle to the base; the strie of the elytra rather deeper, and the punctures more 
distant one from another, the interstices more sparingly punctured; the margins of the prothorax and 
elytra more strongly thickened and reflexed. 
Length 9-10 millim. (d 9.) 
Hab. Nicaracua, Chontales (coll. F. Bates, Belt); Costa Rica, Cache (Rogers) ; 
Panama, Volcan de Chiriqui (Champion). 
Eight examples. From U. bi-impressa, 2 , this species may be known by its narrower 
form, the smoother head, the elevation on each side of the intraocular space stronger 
and extending transversely inwards (as in JU. tricornis and U. depressa), smoother 
thorax, &c 
Allied undescribed forms are found in Brazil. 
3. Ulosonia depressa. 
Form of U. tricornis, and the male cephalic armature as in that species; differing as follows :—Colour dark 
reddish brown, flatter and more depressed, the surface of the prothorax more distinctly punctured and 
with numerous irregularly scattered much coarser shallow impressions (not so coarse as in U. tricornis, nor 
placed principally on the disc), the elytral strie more shallowly impressed and the punctures shallower and 
closer together, the interstices flat and finely and rather closely punctured, the expanded lateral margins 
of the prothorax and elytra rather thinner and more prominent, the under surface very sparingly punctured 
and almost smooth. 
Length 74-9 millim. (¢ 2.) 
Hab. Mexico (coll. F. Bates), Cuernavaca (Sallé). 
