SILIS. 93 
Section I.3. Maris prothorax magis orbiculatus lateribus medio excisis. 
3. Silis premorsa. (Tab. VI. fig. 2.) 
Atra, opaca ; capite flavo, occipite nigro, oculis magnis ; prothorace suborbiculari, lateribus flavis, disco punc- 
tato, opaco, medio depresso; elytris fortiter tricostatis, callo humerali flavo. Long. 8 millim. 3. 
Mas prothoracis lateribus paullo infra medium fortiter profunde excisis, margine utrinque excisionis dentato- 
producto. 
Hab. Guatemata, Cerro Zunil (Champion). 
With this species commences a little section of the genus in which the thorax, more 
or less orbiculate, has a notch in the middle. | 
The specimen described above is a single male captured by Mr. Champion: I have 
seen several other specimens which are near to it in structure, but differ so far in the 
depth and position of the excision that I do not feel it possible to unite them with it. 
The antenne in this specimen are almost simple, the head wide across the eyes. 
The apical abdominal plate split. 
4, Silis nigrita. 
Atra, nitidula; capite flavo, oculis prominulis; prothorace suborbiculari, lateribus infra medium tenuiter 
incisis, flavis; elytris subtiliter coriaceis, callo humerali pedibusque basi pallidioribus. Long. 5} millim. 
SQ. 
Mas prothoracis lateribus infra medium oblique subtiliter incisis. 
Femina? prothorace ad angulum posticum incisione obliqua sat profunda, margine basali truncato; elytris 
lineis tribus elevatioribus. 
Hab. GuateMaua, Chiacam, Quiche Mountains (Champion). 
This is allied to S. premorsa; but, in addition to the prothorax being much less 
deeply cut out in the male, the whole insect is more shining, the elytra less costate. 
The legs are pale in the femora. The two specimens which may, I think, be the 
females, have the thorax less orbiculate, owing to the hind angles being less obliterated, 
as they are in the type, by the tooth-like projection of the margin above them. 
5. Silis heematodes. 
Atra, nitidula ; capite prothoraceque rufis; antennis dimidio corporis longioribus, filiformibus; elytris paral- 
lelis, subtiliter coriaceis, scutello rufo. Long. 6-7 millim. ¢ Q. 
Mas prothoracis lateribus infra medium oblique incisis, margine utrinque excisionis dentato-producto, angulis 
posticis nullis. 
Femina prothoracis lateribus trisinuatis, angulis posticis acute productis. 
Hab. GuatTEma.a, Capetillo, Duefias, Cerro Zunil, Las Mercedes, Chiacam (Champion). 
In this insect the thorax of the male is even more orbiculate than in 8. premorsa, 
owing to the margin projecting less above and below the incision and to the hind 
angles having disappeared. It is easily known from other species described here by 
the head and thorax in both sexes being clear reddish yellow, the only one like it in 
this respect being the following species, S. erythroderes, in which the scutellum is black 
and the thorax more oblong and differently notched. The elytra are elongate and 
parallel, finely coriaceous, with obsolete raised lines, 
