20 Trans. Acad. Sci. of St. Louis. 
3— Neck more or less broad; fourth palpal joint distinct, more or less 
CONICAL. coe eco cece cece tececesesesececccecs secs sccssees sess br yptobia 
Neck extremely slender as in Scopaeus; fourth palpal joint indistinct, ap- 
parently obtuse and more or less pubescent..............*Sphaeronia 
4 — Ligula bilobed at tip; sculpture and vestiture never very dense; labrum 
never strongly dentate at the Middle.. .... cecesesceesccccesececccess & 
Ligula densely fimbriate at tip; labrum dentate only at the middle; sculpture 
and vestiture very dense, the surface devoid of lustre.............+- 8 
5 — Fourth joint of the maxillary palpi compressed and lineate at apex and 
clothed with fine pubescence... cscrcccccccotecenvsressserscecseccee © 
Fourth palpal joint conical, sometimes aciculate, always nude........... 7 
6 — Neck very broad; body feebly convex; hind tarsi filiform...*Dolicaones 
Neck narrow; body strongly convex; tarsi with the fourth joint lobed be- 
NEAL, .cccscvecesesescocaves decvescseseshsvevccs benwmesescsdns PROGEET 
7 — Anterior tarsi always strongly dilated in both sexes, the posterior fili- 
form and simple; body more or less parallel as in Dolicaones and mod- 
erately CONVEX AS &TUlE... voce ccccee cece vececce voce sccescee LAMtNFODIA 
8— Body more or less parallel and feebly convex; anterior tarsi vari- 
BIG 6. ceuwdews $00 BN os phot bee sens eeeveseseecececess asus LALROCRAPOS 
9 — Ligula loosely fimbriate at tip; neck never very slender.......Medones 
Ligula tricuspid at tip; neck variable but never very broad........Seopaei 
10 — Prosternum remaining far below — viewed from below — the level of 
the edges of the hypomera, with a widely open space between the two 
surfaces; tarsi filiform, the fourth joint simple; antennae asin Paederi; 
NECK VETY.SIONAEL. oo ee visidic sevice sees cewcoe sess auecedcwsovecccecs - Stilici 
Prosternum approaching very close to the edge of the hypomera in a verti- 
cal sense, the opening between them narrow but evident; tarsi short 
and stout, the fourth joint bilobed; antennae straight, not flexile at 
the first joint, the apex of the latter not sinuate behind; neck very 
SIENET «+22 eee ccecee rece cceeserssccerece secs seceseserees MELICOPSES 
Prosternum touching or connate with the edges of the hypomera, the coxal 
cavities entirely chitinous..... ... cus bop buMO EN e eos kabemins Vie at ede 
11— Fourth tarsal joint bilobed; antennae straight, not flexile at the first 
joint, the apex of which is not sinuate behind; mentum simple; max- 
illary palpi slender, the third joint elongate and fusiform, the fourth 
small, obtuse and inconspicuous; neck moderately narrow; integuments 
moderately dense; species Small in SiZ€...ceseeevccceescceceeese SUNIL 
Fourth tarsal joint simple; antennae fiexile, the apex of the first joint 
sinuate posteriorly; mentum usually modified at the sides, sometimes 
spinose; third joint of the maxillary palpi more or less securiform or 
otherwise abnormal, the fourth very minute and indistinct; neck usually 
very slender; integuments thicker and much denser; species generally 
VETY SMAll in Size... ccc cccces cccccccccs sevesce: soseseee co KCHiAsteres 
In the following pages 89 genera are defined in the tables 
of genera, of which 64 occur within the limits of the United 
States of America and 25 are exclusively foreign; these 
latter are distinguished in each case by a prefixed asterisk. 
