GONICGLUS. | 605 
structures on the head in the male sex. These prominences apparently offer good 
specific characters, but cannot be used for making a further division of the genus. I 
may, however, call attention to a slight but valuable character for the distinction of 
certain species :—When the scutellum is so broad and short as to appear merely like a 
raised line, there is usually a slight depression extending a little way on each side of 
it, and giving rise to the appearance of a short margin at the base of the elytra; but 
when the scutellum is not so extremely short (in G. hystrix, e. g.) there is no trace of 
this spurious basal margin. 
Group I.—Comparatively large insects, scarcely ever less than 5 millim. in length; the 
head or thorax, or both, armed in the male sex with prominences or even horns; 
the front tibiz unemarginate at the base.—Species 1-8. 
1. Gonicelus unicornis, sp.n. (Tab. XVIII. fig. 22, 3.) 
Ovalis, parum convexus, piceus, nitidus, elytris seriatim fortiter punctatis, pubescentia suberecta sat dense 
vestitis ; prothorace dorso nitido, anterius in medio tantum parce et subtiliter punctato. 
Long. 5-54 millim. 
Mas, prothoracis margine anteriore cornu decurvato armata; capite utrinque plicato-elevato, inter elevationes 
impunctato. 
Hab. GuatEMALA, Panima in Vera Paz (Champion); Panama, Volcan de Chiriqui 
3000 feet, Boquete, Bugaba (Champion). 
This species is distinguished by the less convex form and by the very shining middle 
portion of the thorax. At the sides of the thorax there are numerous very coarse 
punctures, not separated into groups by any distinct smooth spaces; the hind angles 
are acute and very definite. ‘The elytra are furnished with very numerous sete, which 
do not hide the sculpture or prevent the surface from appearing shining; the punctures 
of the series are large except near the suture, and the interstitial punctuation is distinct. 
The sculpture of the under surface is excessively fine and the ventral intercoxal lines 
are very fine. 
In the female the anterior-marginal line of the thorax is distinct in the middle and a 
little angularly sinuate there. Twenty-three specimens. Two females from Caldera are 
aberrant and may possibly belong to another species. 
2. Gonicelus tricornis, sp. n. 
Ovalis, sat convexus, nigricans; elytris seriatim fortiter punctatis, pubescentia suberecta sat dense vestitis ; 
prothorace dorso elevato, anterius in medio fortiter punctato, angulis anterioribus minus longe productis. 
Long. 5 millim. 
Mas, prothorace in medio cornu (basi crassa) decurvato; capite utrinque cornu acuminato, breviore armato. 
Fem. prothorace linea marginali in medio interrupta. 
Hab. Panama, Bugaba (Champion). 
This remarkable little insect is distinguished from G. unicornis by the less prolonged 
