298 SUPPLEMENT. 
Jalapa (Hége) and San Juan in Vera Paz (Champion), but as they are doubtfully 
identified I think it better not to assume hastily that they are so. 
9 (c). Silis ardua. 
Nigro-fusca, parum nitida; prothoracis margine laterali, elytrorumque limbo toto, ore pedibusque pallidis, his, 
tibiis tarsisque fuscis. Long. 6 milliim. ¢ Q. 
Mas. Oculis magis prominulis ; prothorace orbiculari margine sinuato, medio plicato interrupto. 
Femina. Mandibulis fortiter curvatis; prothorace antice rotundato, basi truncato, lateribus leviter sinuatis, et 
ante angulos posticos minute excisis. 
Hab. Panama, Volcan de Chiriqui 2500 to 6000 feet (Champion). 
Distinguished from S. paupercula, which it very closely resembles, by the antenne 
having the second joint very small, about or less than a fourth of the length of the 
third, by the disc of the thorax being dark, and by the form of the thorax in the male. 
From 8. oblita, to which it is more nearly related in structure, by the colour of the 
thorax, by its being less shining and more pubescent, and by the antennz being quite 
fuscous or black. About a dozen examples of this species were collected by Mr. 
Champion, mostly at the higher elevation. 
9 (p). Silis sicula. 
Atra, parum nitida ; ore pallido; prothorace rufo, nigro-limbato, disco profunde sulcato et utrinque tumido ; 
elytris subopacis, creberrime subrugulosis, punctis hic illic seriatis. Long. 6 millim. @. 
Mas. Latet. 
Femina. Mandibulis basi subdentatis, supra dentem fortiter incurvatis. 
Hab. Guatemaa, Purula (Champion). 
Head black ; mandibles, mouth, and epistoma yellow ; antenne shortish, intermediate 
(third to ninth) joints not more than twice as long as wide; palpi dark, only pale at 
their bases. The thorax is rather small, and its margins irregular, bisinuate before the 
hind angles, which are a little acute and prominent. The antenne, legs, and underside 
of the body are dark fuscous, nearly black. 
There are several species, of which this is one, of which the females have the mandibles 
strongly bent and subdentate at their bases, such as S. oblita, S. ardua, and S. nodicollis; 
from the former of these its dark legs and antenne, and from both the latter the colour 
of the thorax and its form, separate it. At present 1 have only seen two females which 
I can assign to S. sicula. 
9 (x). Silis proxima. 
Silidi oblitee valde affinis, nigro-picea, subnitida, parum pilosa; prothorace pallide-testaceo, nigro vittato, trans- 
verso, angulis anticis rotundatis, posticis subrectis, margine laterali (feminw) ante medium minutissime 
plicato ; pedibus flavis, tibiarum apicibus tarsisque fuscis ; antennarum articulo secundo brevi, quam tertius 
triplo breviori. Long. 5 millim. g?9. 
Mas? Prothorace margine laterali antice tuberculari prominulo, infra tuberculum minute inciso, angulo 
_postico acutiusculo. 
Hab. GuatemaLa, Chiacam (Champion). 
