PHILYDRUS. 67 
Terminal joint of maxillary palpi about equal in length to the preceding joint. 
(Subgen. Hnochrus, Thoms.) P. discedens and P. mexicanus. 
Terminal joint of maxillary palpi shorter than the preceding joint. 
Mesosternal lamina large, with sharply marked free angle. VP. nigellus, 
P. equalis, P. debilis. 
Mesosternal lamina small, without angle. P. obscurus, P. ochraceus. 
1. Philydrus discedens. 
Ovalis, convexus, nitidus, nigricans, prothorace elytrisque ferrugineis; antennis basi, palpis, tibiis tarsisque 
testaceis ; capite prothoraceque crebre fortiter, elytris magis sparsim et subtiliter punctatis, his seriebus 
tribus punctorum sat distinctis. 
Long. 22, lat. 1} lin. 
Hab. Mexico, Guanajuato (Dugés, coll. Sallé). 
Maxillary palpi short and stout, quite yellow. Head entirely black, closely and very 
distinctly punctate. Thorax and elytra entirely yellowish red, the former punctured 
like the head, the latter more sparingly and finely punctate, and also with rather 
indistinct almost equidistant series of punctures, but without any rudiments of series 
of larger punctures at the apex and sides. 
This species is allied in structure to the European P. melanocephalus, Bedel 
(Enochrus bicolor, Thoms.), its short maxillary palpi being formed as in the insect 
just named; but the colour of the legs and the punctuation of the wing-cases are very 
different in the two species ; and the mesosternal lamina presents also strong differences, 
it being much larger and more quadrangular in form in the Mexican insect. 
I have seen but three individuals, in very bad preservation. 
2. Philydrus mexicanus. (Tab. II. fig. 11.) 
Oblongo-ovalis, nitidus, nigricans, limbo, antennarum basi, palpis tarsisque sordide testaceis, palpis articulo 
secundo infuscato; capite thoraceque crebre sat fortiter punctatis ; elytris magis sparsim et magis subtiliter 
punctatis, et cum seriebus tribus punctorum sat distinctis. 
Long. 23, lat. 13 lin. 
Hab. Mexico, Oaxaca, Jalapa (Hoge), Puebla (Sallé). 
Maxillary palpi rather short for this genus, the second joint largely brown, and the 
terminal joint brown towards the apex. The punctuation on the head and thorax is 
quite distinct and regular, rather close ; on the wing-cases the punctuation is considerably 
finer and more scanty, and thus allows the distant series of larger punctures to be more 
than usually conspicuous; there is no trace of striation at the sides or apex. The 
prosternum is finely carinate along the middle; and the small angle this carina forms 
in front is very acute, although but very little dependent. The mesosternal lamina is 
very large, and its free angle is a little prominent. 
Although having quite the appearance of an ordinary Philydrus, this species is, so far — 
KK 2 
