68 HYDROPHILIDZ. 
as the structure of the maxillary palpi goes, an Enochrus, the terminal joint being about 
equal in length to the penultimate joint. The few specimens before me are in a fragile 
and decayed condition, and will not bear a prolonged examination. 
8. Philydrus nigellus. 
Ovalis, nitidus, fusculus, limbo dilutiore, antennarum basi, palpis, tibiis tarsisque testaceis ; palpis maxillaribus 
gracilibus sat elongatis, articuli ultimi dimidio apicali infuscato; capite thoraceque sat crebre, elytris magis 
sparsim punctatis, his seriebus tribus punctorum parum distinctis. 
Long. 2, lat. 1 lin. 
Hab. Mexico, Guanajuato (Dugeés, coll. Sallé), Oaxaca (Hége). 
Maxillary palpi rather elongate and slender. Clypeus with a more or less distinct 
pale mark on either side. Sides of the prothorax broadly pale, the dark colour of the 
disk shading gradually into the pallid colour of the side. Elytra sparingly punctate, 
the three longitudinal series of punctures not very distinct. The prosternum is carinate 
along the middle, and in front the carina is very elevated (or rather dependent). The 
mesosternal lamina is very large. 
Although very similar in colour, form, and sculpture to P. meaicanus, the present 
species is nevertheless very distinct ; for, besides the difference in the structure of the 
palpi (P. nigellus having these organs of the normal Philydrus type, with the penultimate 
joint decidedly longer than the terminal joint), its individuals are considerably smaller, 
with more slender and elongate palpi, and with the carina or anterior compression of 
the prosternum more strongly marked. The individuals before me are only four in 
number, and are in a fragile condition. 
4. Philydrus equalis. 
Breviter ovalis, sat latus, convexus, nitidissimus, sublevigatus, nigricans ; supra fusco-testaceus, clypeo ex parte 
majore testaceo, antennarum basi palpisque testaceis ; pedibus rufis. 
Long. 2, lat. I lin. . 
Hab. Mexico, Guanajuato, Cordova (Sallé), Oaxaca, Jalapa (Hége); GUATEMALA, 
Guatemala city, San Gerénimo, Paso Antonio 400 feet, Coatepeque 1300 feet, 
Pantaleon 1700 feet, Chiacam, San Joaquin, Rio Naranjo (Champion); Nicaragua, 
Chontales (Janson). 
This is a rather small, comparatively short and convex insect, with very polished 
upper surface and diminished punctuation. The head is more distinctly punctate than 
the rest of the upper surface; the clypeus is largely yellow, more or less infuscate in 
the middle; the suture separating it from the front is remarkably deep and distinct. 
Thorax only very finely and sparingly punctate. Elytra almost impunctate; but the 
discoidal series of punctures, though very fine, are easily detected, and the sutural stria 
is very deep, and is wanting only on approximately the basal one sixth of the length. 
