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b. The two or four anterior tibiae externally excised. 
a. The posterior tibiae likewise denticulato-pectinated. The body short, 
much broader in front. 
Genus II.— Platysthetus, Mann, cornutus, morsetans, nodifrons. 3. 
(&. The posterior tibiae simple. The body elongate, sublinear. 
Genus III —Oxytelus, Grav . carinatus, piceus, longicornis, sculptura- 
tus, depressus, Americanus, nitidulus, pusillus, caelatus. 9. 
ii. All the tibiae simple. 
Genus IV.—TttOGOPHLiEus, Mann, corticinus. 1. 
Tribe IV.— Omalides ( Depressa, Latr.). 
The antenngp inserted in front of the eyes, beneath an elevated and prominent 
margin of the head. The labrum transverse entire. The palpi short, with dis¬ 
tinct joints, the last minute, conico-acuminate. The head with a distinct neck. 
The abdomen, in the living insect, flat ; the legs simple; the tarsi pentamerous. 
i. The last joint of the tarsi elongate; the rest collectively generally equal. 
a. The four anterior tarsi dilated and spongy. 
Genus I.— Phloeocharis, Mann. Subtilissima. 1. 
b. All the tarsi simple. 
1. The penultimate joint of the maxillary palpi dilated, the terminal one 
small and subulated. 
Genus II. T^enosoma, Mann, gracile, pusillum. 2. 
2. The terminal joint of the maxillary palpi conical and subacuminate. 
*. Antennae thickened towards the extremity. 
a. The body short; the thorax short, transverse, not narrower behind; 
the elytra covering the major portion of the abdomen. 
Genus III. —Omalium, Grav. boreale, consimile, rotundicolle, piceum, 
assimile, inflatum, pygmaeum, sibiricum, quadrum, fimetarium, tectum, ranunculi, 
lapponicum, ophthalmicum, sorbi, depressum. 16. 
b. The body oblong ; the thorax short, transverse, somewhat narrowed 
posteriorly ; the abdomen generally twice as long as the elytra. 
Genus IV.— Anthobium, Mann, rivulare, caesum, oxyacanthae, exiguum, 
pusillum, planum, viburni, florale, nigrum, Gyllenhalli, salicis, salicinum, brurine- 
um, deplanatum, striatum. 15. 
0. The antennae filiform ; the body oblong; the thorax, both before and 
behind, narrowed and rounded. 
Genus V.— Acidota, Kirby, rufa, cruentata, crenata. 3. 
ii. The last joint of the tarsi either as long, or a little longer, than the 
preceding. 
