COLEOPTERA. 
507 
is entire, and the maxillary palpi are almost as long as the head, terminated in a mass formed of the 
third joint, the fourth being concealed or very indistinct, and forming a small point terminating this 
mass, when present, the preceding being very much swollen. These insects live upon the margins of 
water. 
Pwderiift, Fabr., has the antennae inserted before the eyes, filiform, or gradually increasing in size, and longer 
than the head ; body long and narrow; and mandibles toothed and pointed at the tip, with the penultimate joint 
of the tarsi bifid. Type, Slaph. riparius, Linn., [a pretty little common British species]. 
Stilicus, differs in having all the joints of the tarsi entire. 
Procirrus, Latr., has the last joint of the maxillary palpi distinct, and forming a terminal mass ; the head is 
attached by a long peduncle ; thorax long and narrow ; and the fore tarsi dilated. P, Lefeburi, Latr., Sicily. 
Evesthetus, Gray., has the antennae inserted before the eyes, but not longer than the head, and moniliform ; body 
slightly elongated. E. scaber, Grav. 
Stenus, Latr., has the antennae inserted near the inner margin of the eyes, and terminated by a mass formed of 
the last three joints; the eyes are large, and the mandibles furcate. Staph, biguttatus, Linn. ; black, with a red 
dot on each elytron ; [very common.] 
The third section, Denticrura, differs from the preceding in having the maxillary palpi much shorter 
than the head, with four distinct joints ; the tibiae at least of the fore-legs are toothed or spined ; the 
tarsi fold back on the tibiae, and have the last joint as long as all the preceding together, some of Avhich 
are more or less obsolete. The front of the head is cornuted in the males of some species. 
Oxytelus, Grav., differs from all the rest in having the palpi terminated by a hatchet-shaped joint, the antennae 
moniliform and gradually thickened, with only three distinct joints to the tarsi. [A very numerous genus.] 
Osorius, Leach, has the palpi filiform, the body cylindric, and the mandibles much shorter than the head. The 
species are from South America. 
Zirophoriis, Dalm. (Irenceus, Leach ; Piestus, Grav.), has the body depressed, the fore tibias alone toothed on the 
outside, the antennae at least as long as the head and thorax, and mandibles as long as the head. (See Daiman’s 
Anal. Entomol., p. 23.) 
{LeptocMrus, Germar, differs from the last in the antennae being very short. The species of both are tropical.] 
Prognatha, Latr. {Siagonium, Kirby) [not Siagona], differs from Zirophorus in the antennas being filiform, and 
composed of elongated joints. [<S. quadricorne, Kirby ; a rare British species.] 
Copropliilus, Latr. [Elonium, Leach], has the body flattened, but all the tibiae are toothed on the outside; the 
antennae much longer than the head, and the mandibles not toothed. Omalium rugosum, Grav. 
The fourth section, Bepressa, has the head free, the labium entire, and the maxillary palpi short, with 
four distinct joints; but the tibiae are simple, without teeth or spines, and the tarsi distinctly 5-joiuted. 
Omalium, Grav. (having the thorax as broad as the elytra, and transverse-quadrate), Lesteva, Latr. {Antho- 
phagus, Gi’av., having the thorax narrower than the elytra, and in the form of a truncated heart), have the palpi 
filiform, but the following have them hatchet-shaped 
Micropeplus, Latr., has the antennae terminated by a solid club, and received into channels of the thorax. M. 
porcatus, [a minute British species]. 
Proteinus, Latr., has the antennae perfoliated, and thickened towards the tip, but free, and inserted before the 
eyes. [P. ovalis, a common insect found in moss.] 
Aleochara, Grav., has the antennae inserted between the eyes, or near their lower edge, and free ;, the thorax is 
nearly oval, or square, with the angles rounded. [A very extensive group of insects, now cut up into a great 
number of genera and subgenera by Stephens, Erichson, and others.] 
The fifth section, MicrocepJiala, has the head received into the thorax as far as the eyes, not being 
attached by a neck, nor an evident narrowed space ; the thorax is trapeziform, and enlarged from the 
front to the hind part ; the body is less elongated than in the preceding, and approaches more an 
elliptical form ; the head is much narrow er, and sharpened in front ; the mandibles of moderate size, 
without teeth, and simply curved to the point ; the elytra, in many, cover more than the half of the 
abdomen. Some of the species live in fungi, or upon dowsers, and others in dung, 
Lomeclmsa, Grav., has no spines to the tibiae ; and the antennae (often shorter than the head and thorax), after 
the fourth joint form a perfoliated mass ; and the palpi are terminated by a hatchet-shaped joint : some have 
the sides of the thorax not raised. Aleochara bipunctata, Grav., &c. ; and the others have them elevated: these 
form Gravenhorst’s genus Lomechusa ; L. paradoxa, &c. 
Tachinus, has the tibiae spiny, the joints of the antennae are pear-shaped, and the palpi filiform. Type, Oxg- 
porus subterraneus, and many other Oxypori, Fabr. 
Tachyporus, Grav., is like Tachinus in the tibiae and antennae, but the palpi are terminated by a hatchet-shaped 
joint. Oxyporus rujipes, Fabr., Chrysomeliuus, Fabr., and a great many others. 
Callicerus, Grav., stated by Latreille to be unknown to him, [is oblong depressed; with the last joint of the 
antennae disproportionately long ; the third joint of the maxillary palpi swollen; and the last minute. Type, 
Spencii, K. Curtis, Brit. Ent., pi. 443.] ' 
Stenosthetus, Meg., andDej. Cat., must be suppressed, being a true Pselaphus, [or rather an EuplectusL 
