MALACODERMATA. 303 
15. Silis longicornis. 
Nigro-fusca ; ore prothoraceque flavis, abdomine fusco, flavo-marginato, vel flavo apice fusco; antennis quam 
corpus longioribus, articulis leviter serratis. Long. 8 millim. ¢. 
Mas. Prothorace subquadrato, margine laterali pone medium leviter plicato vix interrupto. 
Hab. Mexico, Oaxaca (Boucard, coll. Sallé). 
This species bears a very puzzling aspect, for, unlike other members of the genus, the 
thorax, although the specimens are males, has scarcely any trace of the usual folding 
or excision of the thoracic margin. The great length and slight serration of the 
antenne is, however, similar to that of the European species. The external claws 
appear thickened and laminate. 
Three specimens from the Sallé collection are all I have seen. 
16. Silis sallei. 
Fusca, nitidula; capite infra, ore, epistomate, et verticis macula, pallide-testaceis ; prothorace testaceo, lineis 
duabus sublateralibus nigris ; coxis et femoribus testaceis, his externe, tibiis tarsisque fuscis. Long. 63-7 
millim. ¢ 9. 
Mas. Prothoracis disco lateraliter oblique sulcato, margine inflexo, tenuiter plicato. 
Hab. Mexico, Cordova (Sai/é). 
Antenne of the male about four fifths of the length of the body, those of the female 
shorter, fuscous, second joint very short, third and following joints subequal, very 
finely pubescent; apices of the mandibles and palpi pitchy. Thorax longer than wide, 
without any nick at the sides in the males, but, examined from the front, the margin 
runs downwards and backwards, so that the hind part of the black line becomes 
tubercularly raised ; the inflexed margin is yellow. Scutellum and elytra fuscous, the 
latter and the legs finely pubescent ; abdomen fuscous. 
There are four specimens of this species in Sallé’s collection, two of each sex. 
17. Silis coarctata. 
Fusca, nitidula; capite prothoraceque aurantiaceis, scutello flavo; elytris nigris, crebre subtiliter subrugose- 
punctatis ; pedibus nigris, coxis anterioribus flavis. Long. 5 millim. ¢ Q. 
Mas. Prothoracis margine laterali oblique constricto plicato, segmento ventrali septimo fisso dehiscente. 
Femina. Latet. 
Hab. Mexico, Cordova (Sal/é). 
A species superficially resembling Silis pausxilla, but in addition to the red head and 
scutellum, the constriction of the thorax takes place in a different manner, it not having 
the margin thickened or prominent in front ; the antenne have their second joint shorter 
and the following ones much longer in proportion. ‘The species, in short, belongs to 
another section. The antenne of the male are very nearly as long as the body. 
The elytra are greyish black and dull. ‘The centre of the thorax is rather broadly 
depressed. 
Five specimens, all males, in the Sallé collection. 
