MALACODERMATA. 305 
Mas. Prothoracis margine laterali ante medium tuberculari, incrassato, infra medium plicato constricto. 
Femina. Prothorace latiore, margine laterali in medio minute plicato. 
Hab. Guatemata, Cerro Zunil, Senahu in Vera Paz (Champion); Panama, Volcan de 
Chiriqui 2000 to 4000 feet (Champion). 
Var. Pedibus basi testaceis. ¢ Q. 
Hab. Guatemata, San Juan in Vera Paz, Cubilguitz (Champion). 
Var. Capite etiam rufescente basi tantum nigrescente. 
Hab. Panama, Volcan de Chiriqui (Champion). 
Head as wide as the thorax in the male, rather narrower in the female, well sunk in 
the thorax ; eyes not large nor prominent. Antenne not so long as the body; their 
second joint short, but not so short in proportion as in S. minuta. Disc of the thorax 
with a longitudinal wide impression, not very shining, having minute punctures and 
fine adpressed hairs. Elytra rather distinctly and subrugosely punctured. Legs black; 
palpi pitchy, apical joint of the maxillaries perhaps a little more widely hatchet-shaped 
than in its near ally S¢lis appendicularis. 
We are indebted to Mr. Champion’s indefatigable exertions for a series of specimens 
of this little species; these were chiefly collected on the Volcan de Chiriqui, but a few 
occurred in other localities ; without such a series it might easily have been confounded 
with several species of Stdis which occur with it. I cannot at present satisfactorily 
make out whether the claws are split; I believe, however, they are simple. The 
apical segment of the abdomen is divided as in Stlis and Discodon 
21. Silis minuscula. 
Plumbeo-nigra, parum nitida, pube brevi cinerea sericea densius vestita; ore, prothorace (vitta mediana 
excepta) pedibusque basi rufis. Long. 33-4 millim. ¢ &. 
Mas. Prothoracis margine laterali ante medium tuberculari, incrassato. 
Femina. Prothorace latiore, fere integro. 
Hab. Guatemaa, Zapote, San Isidro, Cerro Zunil (Champion). 
Very closely allied to S. pausxilla, and agreeing with it in the relative length of the 
joints of the antenne, and the male characters, but differing in the legs being red at 
the base, in the black vitta of the thorax, and the silky grey pubescence of the elytra. 
The antenne have the two basal joints pale red, only touched with fuscous above ; they 
are longer in the males than in the females ; their second joint is not very much shorter 
than the third. The coxe, trochanters, and femora, except at the tips, are red. The 
apical ventral plate is divided in the males, but does not gape. 
22. Silis minuta. 
Atra; ore pedibusque basi testaceis ; prothorace rufo, nigro-vittato, antennarum articulo secundo perbrevi. 
Long. 34-4 millim. ¢. . 
Hab. Guatemaua, Zapote (Champion). 
BIOL. CENTR.-AMER., Coleopt., Vol. III. Pt. 2, May 1885. 2k 
