154 Trans. Acad. Sci. of St. Lowis. 
teeth, which are long, very acute and prominent, the outer teeth very 
minute and sometimes rather widely separated from the inner. Body 
moderately large in size, depressed, shining or alutaceous, the sculpture 
very fine; head rather small, the elytra large; outer lobe of the para- 
glossae longer than the inner, both pointed; third maxillary palpal 
joint long, rather slender and compressed; eyes rather well developed; 
antennae moderately long and slender, scarcely visibly enlarged dis- 
tally, the joints subcylindrical; neck a little less than half as wide as 
the head; prosternum strongly carinate posteriorly; hind tarsi very 
long and slender, filiform, four-fifths as long as the tibiae, the basal 
joint almost as long as the next two combined; anterior tarsi slightly 
dilated, more distinctly in the male. Nearctic regions.....Platymedon 
Labrum with the usual small median notch and four very small teeth, the 
latter much less unequal among themselves and frequently very difficult 
CO PETCOIVEsoecescceccccerveccacrecccscchavese ceveeieecscvecoseves ho 
15 — Elytra small, not longer than the prothorax; eyes small..........--16 
Elytra well developed, always longer than the prothorax, the eyes large..17 
16— Body minute in size, polished, sparsely punctured, the gular sutures 
wholly obsolete and traceable only by the absence of punctures on the 
intervening surface; antennae short, the basal joint stout, the remainder 
very slender but unusually clavate distally; neck rather less than half 
as wide as the head; palpi short; prosternum tumid but scarcely cari- 
nate posteriorly; hind tarsi short, moderately stout, the basal joint 
nearly aS long as the next two combined, the anterior feebly dilated. 
Caribbean region. ccccrsccivecsccdccscnescescocceccceccesso MOGONCLIS 
Body very small in size and of slender form, shining though rather coarsely 
and closely sculptured; gular sutures fine and sometimes subobsolete; 
antennae longer, normal, thicker, feebly enlarged distally; neck two- 
fifths as wide as the head; palpi longer and well developed; prosternum 
rather strongly carinate except anteriorly; hind tarsi longer, very slen- 
der and filiform, the basal joint distinctly shorter than the next two 
combined; anterior tarsi slightly thickened but not at all dilated. 
Pacific Coast TEQIONS..ceseeeescecccccecseve cosevcoccesess Oligopterus 
17— Body moderate to very small in size, slender, more or less finely and 
closely sculptured, the gular sutures fine; head small as arule; anten- 
nae rather short, moderately stout, filiform, scareely thickened dis- 
tally; neck two-fifths as wide as the head; prosternum strongly cari- 
nate posteriorly; hind tarsi long and very slender, filiform, the basal 
joint nearly as long as the next two combined, the anterior not at all 
dilated and but feebly thickened even in the male. Pacific coast regions. 
Caloderma 
18 — Body moderate to small ia size, rather slender, frequently dull in lus- 
tre and extremely finely, usually closely punctulate; head small, the 
elytra at least as long as the prothorax; palpi well developed, the lobes 
of the parag!ossae small; mentum unusually elongate; gular sutures very 
fine and remotely .separated, most approximate anteriorly and thence 
widely diverging to the base; antennae rather thick, filiform, not 
appreciably enlarged distally; eyes well developed; neck two-fifths as 
wide asthe head; prosternum carinate posteriorly; hind tarsi rather 
short, somewhat stout, the basal joint longer than the second, the 
