92 | HYDROPHILIDA. 
brought to light. The two individuals before me differ considerably inter se, one 
having the prothorax more red, less densely punctured, and with the dorsal foveole 
deep and distinct, while in the other specimen the latter are but indistinct ; it is 
possible these may be sexual characters. 
4, Octhebius similis. 
Parum elongatus, capite thoraceque eneis, nitidis, hoc versus latera rufescente; elytris testaceis, sneo 
suffusis; antennis, palpis pedibusque testaceis; vertice profunde bifoveolato ; thorace canaliculato, sat 
fortiter et crebre punctato, utrinque biimpresso, impressione anteriore magna, posteriore obliqua parva, 
angulis posterioribus excisis, excisione membrana parvula completa; elytris ad apicem attenuatis et 
acuminatis, striatis, striis crebre sat fortiter punctatis ; corpore subtus rufo-fusco. 
Long. 1, lat. 3 lin. 
Hab. GuateMaLa, Guatemala city, 5000 feet (Champion). 
This species appears to be very closely allied to the European O. pygmeus, but there 
is a deep and distinct, though small, oblique depression on each side of the thorax, and 
the large impression which separates the anterior angle from the rest of the surface 
appears to be rather deeper and more sharply defined ; the sculpture of the elytra is 
also deeper and more distinct. In most other respects there is a great resemblance 
between the two. I have seen only a single individual. 
5. Octhebius obscurus. 
Sat elongatus, niger, subopacus ; antennis, palpis pedibusque rufis; capite parce punctato, vertice biimpresso ; 
prothorace transverso, parum punctato, ad angulos anteriores rugoso, utrinque impressione elongata parum 
profunda, lateribus ante basin angustatis, membrana pellucida auctis; elytris seriatim punctatis, parcius 
breviterque setosis. 
Long. 1, lat. 3 lin. 
Hab. Mexico, Guanajuato (Dugés, coll. Sallé). 
Head very faintly and sparingly punctate, the vertex with two large impressions. 
‘Thorax only very sparingly and rather finely punctate, with an excessively fine almost 
obliterated channel on the disk, and on each side with a peculiar elongate sinuate 
longitudinal impression, extending nearly the whole length of the thorax; the sides in 
front are for a short distance straight, and are, after that, much narrowed to the base ; 
a narrow white membrane extends along the oblique part of the side. The elytra are 
not striate, but bear very regular series of punctures, each puncture bearing an extremely 
fine, short, indistinct white seta; the interstices are impunctate and much broader than 
the series of punctures; the punctures of the series are well isolated from one another, 
each being separated from its neighbour by a space larger than the size of the puncture. 
The three individuals before me show some variation in'the punctuation of the 
thorax. The species may be placed near the European 0. pilosus. It stood in the 
Sallé collection under the manuscript name of “0. obscurus, E. Dugés.” 
