Casey — A Revision of the American Paederint. 73° 
14— Gular sutures nearly straight, feebly converging posteriorly through- 
out and most approximate at or near the base of the head; maxillary 
palpi unusually elongate and slender, the fourth joint very slender and 
aciculate. Europe and AMerica.......seeseeecece cececeee Netartopeus 
Gular sutures arcuate, most approximate at or before the middle of the head, 
gradually diverging thence to the base; maxillary palpi rather less 
elongate and stouter; head nearly similar; species small in size. 
AMETICA 60 ccs ctecceccce cece cecececccccccscsessccsescece: DOFRUOPCUS 
15 — Parallel, the neck wide, rather more than half as wide as the head, 
the latter transversely truncate. at base, the labrum deeply and broadly 
cleft to the base, the lobes long, moderately diverging, parallel, slightly 
everted and evenly rounded at tip; fourth palpal joint evenly conical, 
not compressed; gular sutures widely separated, parallel, becoming 
feebly convergent toward base, where they are most approximate; 
antennae half as long as the body; prothorax short and broad, with 
the apical angles distinct, the prosterum short before the coxae as in 
Lathrobium; elytra a little wider and longer than the prothorax, with 
the punctures subserial in arrangement; legs rather short and stout, 
the hind tarsi moderately long and slender, with the first, third and 
fourth joints subequal, the second a little longer, the fifth as long as 
the preceding four combined; claws unusually long and _ strong. 
BULOPC. +. ee cesecccececcccerseccrerescscreceseeecees sees, AChOniUM 
Parallel and rather broad, nearly as in Achenium, the head, prothorax and 
elytra proportioned almost similarly; labrum very short, the emargina- 
tion extending throughout the width, the sides not lobiform; gular 
sutures parallel and broadly arcuate, not very widely separated and 
most approximate at the middle; fourth palpal joint compressed; neck 
fully three-fifths as wide as the head; elytral punctures confused, not 
at all serial in arrangement; legs rather long, moderately stout, the 
hind tarsi long, slender, with the basal joint much elongated, subequal 
in length to the next two combined and longer than the fifth. 
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16— Gular sutures less separated, converging posteriorly, becoming most 
approximate at or near the base of the head; basal joint of the hind 
tarsi distinctly shorter than at the Second.........0 .ssccccccevccrseld 
Gular sutures parallel, broadly arcuate to nearly straight, most approxim- 
ate at or near the middle of the post-oral surface or at least distinctly 
HOLORS SRG: DANG sin -6s's 6 on 6 /c'kn i's an did vioeeadnbvane edeaaee Goede wewndaleseke 
Gular sutures generally more widely separated, most approximate ante- 
riorly, gradually more or less divergent posteriorly, becoming most 
CiSGAIE. RE GG ERGs 6 ohn 0 o's'cs oink 0d daha Weep dens MeaeaNe Neder kee cle 
17 — Body large, stout, parallel, the head arcuato-truncate at base, with very 
broadly rounded obsolete angles, the neck but little more than a 
third as wide; lobes of the labrum obliquely subquadrate; prothorax 
oblong-suboval, the anterior angles rounded; abdominal segments 
feebly impressed at base; legs and tarsi thick. Eastern America. 
. Eulathrobium 
Body rather large, more slender and convex, parallel, the head circularly 
rounded or feebly subtruncate behind, the neck about two-fifths as 
wide; lobes of the labrum evenly rounded throughout their contour; 
