96 MALACODERMATA. 
11. Silis dilacerata. (Tab. VI. fig. 4,3.) 
Nigra, subnitida; prothorace rufo, disco fossulato, nitido, nigro-vittato; elytris plumbeis, margine laterali 
tenuissime albidis. Long. 5-53 millim. ¢ Q. 
Mas prothoracis lateribus processu duplici laminato, posteriore contorto, biacuminato. 
Femina prothorace transverse subquadrato, antice angustato, juxta angulum posteriorem minute exciso, disco 
bifoveolato. 
Hab. Mexico, Cordova, Capulalpam (Sallé), Juquila (Boucard, coll. Sallé); GUATEMALA, 
Capetillo, Zapote, San Gerénimo, Santa Rosa, Purula, Teleman, San Juan (Champion). 
Var. thorace toto rufo. 
Hab. British Honpuras, Rio Hondo (Blancaneaux); Guatemala, San Gerénimo 
(Champion); Nicaracua, Chontales (Janson). 
The figure in the Plate represents a male specimen from Capetillo. This species is 
distinguished from S. distorta by being rather less broad and more shining, by the 
posterior process of the thorax in the male being in a manner bifid, and not so 
apparently winding, while the anterior lamina does not overlap it so plainly. The disk 
of the thorax is very shining, and in the male with a deep. fossa, which is entirely 
impunctate and longer than wide. In the female this is represented by a double and 
much smaller impression. The fossa and disk in front and behind are black; but the 
whole hinder part of the thorax is never so as it is in S. distorta. More rarely the 
whole thorax is red. Two examples from San Gerénimo have the suture narrowly pale. 
12. Silis albicincta. (Tab. VI. fig. 5, 3.) 
Silis albicinctus (Chev.), Sallé coll. 
Nigra; ore prothoraceque rufis ; elytris marginibus et sutura concinne albis, scutello pallido. Long. 5-53 millim. 
de. 
Mas prothoracis lateribus processu duplici laminato; anteriore cultriformi, cum posteriore annulum quasi 
prebente; disco profunde fossulato. 
Femina prothoracis disco leviter impresso, angulis posticis truncatis. 
Hab. Mexico, Toxpam, Cordova (Sallé) ; Costa Rica, Volcan de Irazu (Rogers). 
Var. antennis, palpis pedibusque rufis; capite etiam nonnunquam rufo. ¢ Q. 
Hab. Panama, Volcan de Chiriqui (Champion). 
Head black, mouth whitish, palpi dark at their apices; eyes prominent, the head 
contracted behind them. Thorax red, the lateral laminz of the male complicated, the 
anterior one being much bent backwards into the sinus formed by the posterior. Its apex 
appears to have a double acuminate angle. The posterior process is a twisted laminar 
plate directed from the hind angles forwards; the basal margin beneath it appears 
acutely incised. 
Viewed from above these processes are confused and simply present the appear- 
ance of a hole having been pierced near the hind angles. The central fovea in 
the male is a deep round pit, impressed in the centre. The elytra widen from 
