HYDROCOMBUS. 71 
palpi very slightly bent in such a manner that when extended the curve of the part is 
concave in front or inwardly, whereas in Philydrus the curve of the joint is in the 
opposite direction. Hydrocombus, however, is distinct from Cymbiodyta; for it has a 
transverse elevation on the mesosternum, in place of the longitudinal one existing in 
the latter genus. 
The genus, so far as I know at present, is restricted to North and Central America. 
1. Hydrocombus brevicollis. 
Latus, breviter ovalis, nitidus, piceus, clypeo utrinque et prothoracis elytrorumque lateribus dilutioribus; anten- 
narum basi, palpis pedibusque testaceis ; sat crebre punctatus, elytris seriebus decem punctorum magnorum, 
quarum 1*-3™ anterius plus minusve abbreviatis, 
Long. 23, lat. 12 lin. 
Hab. Mexico, Oaxaca (Hége). 
This species is remarkable by the very coarse punctures of which the series on the 
wing-cases are composed. The palpi are entirely yellow and rather elongate; the head 
short and broad. The strie on the elytra are very deep and bear remarkably coarse 
punctures; the outer seven of these strie extend from the apex to the base, but the 
three internal are abbreviate in front. There is also a sutural stria, which is very deep 
behind, but becomes fainter and disappears in front. The head and thorax are rather 
closely punctate ; and the portions of the elytra where there are no strie are rather more 
finely punctured than the head and thorax. The prosternum is obscurely carinate along 
the middle, and forms a small prominent angle in front. The mesosternal lamina is 
rather strongly elevated, but is narrow and its lower edge is a rounded angle. 
2. Hydrocombus fraterculus. 
Oblongo-ovalis, nitidus, piceus, prothoracis elytrorumque lateribus dilutioribus ; antennarum basi, palpis pedi- 
busque testaceis; crebre punctatus, elytris seriebus decem punctorum, quarum internis anterius plus 
minusve abbreviatis. 
Long. 23, lat. 13 lin. 
Hab. Mexico, Guanajuato (Dugés, coll. Sallé). 
This species has the ordinary appearance of a Philydrus, but appears, so far as the 
two badly preserved individuals before me enable me to judge, to be closely allied in 
structure to H. brevicollis. The upper surface is rather closely and distinctly punctate, 
and there are some series of punctures quite distinct and rather coarse but not placed 
in striee or depressions ; the outer two, however, are deeper than the others, and almost 
become punctate strie. The series nearer than these to the suture become finer as the 
suture is approached ; and all cease before attaining the base ; the more internal series 
are shorter as well as finer than the others. On the interstices between these series 
there are some punctures irregularly placed; and these are considerably larger than the 
other more numerous punctures of the surface. 
