SILIS.—TRYPHERWUS. 97 
the base; they are deep shining black, with conspicuously white edges. The legs are 
black with pale coxe. 
The specimen figured is one from the Volcan de Irazu. 
13. Silis rufifrons. 
Nigra; capite, prothorace et scutello rufis. Long. 5-53 millim. ¢ 9. 
Mas prothoracis lateribus processu duplici, posteriore longius biacuminato, spinifero. 
Femina prothoracis angulis posticis acute excisis. 
Hab. Guatemata, Chiacam (Champion). 
Rather closely allied to Stlis dilacerata; but, independently of the red colour of the 
head, there are permanent distinctive differences: viz. the thorax is shorter; in the male 
the front process is, as it were, only the portion of the front margin left by the deep 
excision of the inferior part of the side, and the hinder process is quite different in 
shape, with a long spine on its basal side. In the female the hind angles have an 
excision; in S. dilacerata there is none. The antenne of the male are as long as the 
body, but in the female much shorter. The elytra are quite black. 
14, Silis laticollis. (Tab. VI. fig. 17, ¢.) 
Atra, subopaca ; prothorace lato; elytris rugose punctatis ; abdomine apice flavo. Long. 5 millim. g. 
Mas prothoracis lateribus fortiter incisis, infra incisionem processu laminato, disco obsolete biimpresso. 
Hab. Mexico, Jacale (Sal/é). 
This is a very distinct species, and as it were intermediate between species of the group 
to which S. premorsa belongs and S. distorta and the two preceding species. It is 
entirely black, excepting the apex of the abdomen, the mandibles, and mouth. The 
thorax is wider than the elytra; the latter are coarsely punctured and substriate, scarcely 
covering the abdomen. ‘The antenne are nearly as long as the body. 
The whole insect is robustly built. 
Subfam. MALTHINT. 
The species of this subfamily are of small size, and remarkable for their shortened 
elytra. Some of the genera have very curious anal appendages and apices of the 
abdomina. The genera, with two exceptions, seem poor in species, but are still widely 
distributed. Two of them, however, viz. Malthinus and Malthodes, are well known 
European forms abundant in species, and common on trees and bushes in early summer. 
TRYPHERUS. 
Trypherus, Leconte, Proc. Acad. Phil. v. p. 846 (1852) ; Trans. Ent. Soc. Am. ix. p. 58. 
Lygerus, Kiesenw. Linn. Ent. vii. p. 246 (1852). 
Founded by Leconte for a species found in the United States, and which is nearly 
BIOL. CENT.-AMER., Coleopt., Vol. III., Pt. 2, October 1881. O 
* 
