[April 
jIelochaees, Mulsant. 
Of an oblong-oval form ; mesosfcernum simple ; tibiae feebly spinnlose 
maxillary palpi very long, the third joint not so long as the second, and the fom-tl 
not so long as the third, but more than half the length of the second. Labial palp 
short, the third joint not quite so long as the second. 
Two British species ; limdus and pimctatus. 
This genus, established some years ago by Mulsant, has not beei 
generally accepted by entomologists, and is usually considered a sub 
division of Fhilhydrus : from this, however, it is distinguished readily 
by its simple mesosternum and its longer maxillary, in conjunction witl 
its shorter labial, palpi ; this last character, a very striking one, seem! 
to have entirely escaped attention up to this time. The species o 
Selochares are flatter than the PMlhydri, and rather narrower to th( 
front ; this and the more developed maxillary palpi give them a faciei 
of their own, easily recognised after it has been once seized.* 
3. Philhtdhtjs, Solier. 
Of an oblong-oval form ; mesosternum carinated, tibiae feebly spinnlose 
Maxillary palpi long, second joint considerably longer than the third, and th( 
third than the fourth ; the fourth not quite half so long as the second. Labia 
palpi long and slender. 
We have six indigenous species ; testaceus, maritimus, melanoce 
plialus, nigricans, ovalis and marginelhis. 
Obs. — The figures are drawn from dissections of P. melanoceplialus 
in P. maritimus, the labial palpi, though similar in structure, are rathei 
shorter, and not quite so slender, and the mentum is even more roundec 
in the middle. 
4. Enochrtjs, TJiomson. 
Of an oval, convex form ; mesosterntim carinated, tibi89 feebly spinnlose 
Maxillary palpi rather long, third and fourth joints of nearly equal lengths ; secouc 
longer than either of them. Labial palpi rather short. 
The single species of this genus, ^. hicolor, Paylc, has hithert( 
been placed in the genus Sydrobius, from which it differs in numeroui 
important characters. It is distinguished from Fhilhydrus, however 
only by the diff'erences of the palpi ; and, as it has in every respec 
the facies of that genus, if Enochrus be not adopted, it must be con 
sidered as a section of Fhilhydrus. 
* In making the iibove engraved drawings from Dr. Sharp's dissections, T have, moreover, ob.servec 
that the mentiim in Helochares liviilus is of a very difierent structure to that of Philhydrus, havin! 
an acute triangular notch in the middle of its anterior margin. Dr. Sharp (to whom I pointed this out 
and whose observation it had escaped through the medium in which his dissections were mounted nu 
having dried up enough for minute investigation) has verified this bv further observatioDS.— E. C. li. 
