1867.] 145 
Genus Exopholis. 
Motschulsky (Etudes Entom., 1859, p. 98). 
This genus, founded by M. Motschulsky upon Melolontha hypoleuca, 
Wiedm., is separated from LeucophoUs, with which it had hitherto been 
confounded, on account of the labrum having a central tooth ; a cha- 
racter first pointed out, as I believe, by M. Lacordaire in his Greuera 
des Coleopteres (vol. iii., p. 300, note). As the genus has never been 
properly characterized, I have thought it well to do so now. 
Mentum sub-rectangular, toothed in the middle of the anterior 
margin, anterior angles produced : two oblique ridges, springing 
immediately below the insertion of the palpi, unite with a third (part 
of which forms the central tooth in the anterior margin) and form an 
inverted Y- Maxillae short, with five or six blunt teeth on the inner 
side. Mandibles acuminate, with three or four blunt teeth on the 
inner side. Labrum with a central acute tooth, slightly emarginate 
on either side. Apical joint of the labial palpi equal to the two pre- 
ceding joints together. Head sub-quadrate ; clypeus with the angles 
rounded, the anterior margin very slightly reflexed. Antennae 9-jointed ; 
first joint elongate, second sub-ovate, third and fourth joints elongate, 
sub-equal ; the three last joints forming a short ovate club. Thorax 
transverse, with the sides more or less rounded, anterior angles acute, 
posterior obtuse or sub -rectangular. Elytra oblong, costate. Anterior 
tibijB with two or three teeth, and with a spur. Posterior legs as in 
LeucophoUs. Mesosternum but little prolonged. The upper surface of 
the insect is almost destitute of scales. The under-side covered, except 
the suture of the mesosternum and abdomen, with fine yellow or white 
scales, especially the sides of the abdomen. 
M. Motschulsky describes (Joe. cit.) a species of this genus (Eje. 
Birmannicd) which appears only to differ from E. hypoleuca in its 
greater size, broader and more oval form ; the punctuation and rugosity 
being stronger on the thorax and less on the elytra ; the anterior angles 
of the thorax more prominent ; and the prolonged part of the antei'ior 
tibia? narrower and not dilated at the extremity. 
Ex. Blrmannica may possibly prove to be only a local variety of 
hypoleuca. M. Motschulsky seems only to have seen a single specimen. 
I have before me a number of specimens, all of which I believe to be 
hypoleuca, from Tenasserim, Penang, Java, and Borneo, varying in 
colour from testaceous to dark chestnut-brown, and from 7 to 13 J lines 
in length, with every intermediate degree. There is some diversity of 
form even in those from the same locality ; the specimens from Borneo 
(with one from Sumatra), however, have the sides of the thorax less 
rounded than is usual. 
