74 Trans. Acad. Sct. of St. Louis. 
‘prothorax elongate-oval, the angles obliterated; abdominal segments 
strongly, transversely impressed at base; legs and tarsi rather slender. 
Pacific coast Of AMerica...... ++. seeccesecececeescesees Lathrotropis 
18 — Body somewhat small in size, more or less slender and less convex, 
parallel, the head oval or subquadrate, with the basal angles more or 
less rounded; eyes rather small in size, anterior; labrum short, the 
lobes widely divergent, more narrowly rounded laterally; maxillary 
palpi slender and elongate, not inflated; antennae more or less slender 
and elongate, the joints obconical; neck always noticeably less than 
half as wide as the head; prosternum rather long before the coxae, fre- 
quently feebly carinate throughout the length; prothorax more or less 
narrow and elongate-oval, with the anterior angles broadly rounded or 
obliterated, the punctures generally dense and confused, with the 
median impunctate line frequentiy subelevated; elytra frequently 
longer and wider than the prothorax, the punctures generally feebly 
sublineate; legs rather long and slender; tarsi as in the preceding 
genera. Europe and America.........essees coecccccceess LODrathium 
Body larger in size and less punctate; posterior tarsi rather shorter but more 
or less slender, the first joint subequal to the second and each longer 
than either the third or fourth, the fifth subequal in length to the first 
two together; body moderately large in size, rather broad, moderately 
convex, the head generally distinctly narrower than the elytra, broadly 
arcuato-truncate at base, the angles rather distinct and more or less 
narrowly rounded; eyes well developed; labrum with a large triangular 
notch, the lobes obliquely subquadrate, each subrectilinear at apex; 
maxillary palpi more or less elongate, not inflated, the fourth joint con- 
ical and acutely pointed; neck broad, more than half as wide as the 
head; antennae rather long and slender as a rule, filiform; prosternum 
short before the coxae; prothorax more or less oblong or obtrapezoidal, 
moderately elongate, with the anterior angles distinct; elytra larger than 
the prothorax, with the punctures generally sparse and always lineate 
in arrangement; legs rather long and slender. America... Lathrotaxis 
19 — First and second joints of the hind tarsi equal or with the first a little 
longer than the 8OCONG 6. 6sccsdesiesaeteete iehe daca shed cecssede 20 
First joint of the hind tarsi much shorter than the second.........se.6. 22 
20— Hind tarsi shorter, the four basal joints short and subequal, the fifth 
moderate; anterior tarsi feely dilated. Body very small, slender, rather 
depressed, the head small, broadly arcuato-truncate.at base, the labral 
lobes thick, subquadrate, with rounded angles; eyes rather small; max- 
illary palpi short and stout, the third joint somewhat inflated; gular 
sutures very widely separated and strongly divergent, being separated 
at base by about a third the width of the head; antennae rather long 
and thick, the joints obconic; neck half as wide at the head; proster- 
num short; prothorax short, oblong, the angles acutely defined, the 
median impunctate area defined by impressed lines; elytra well devel- 
oped as a rule, longer and wider than the prothorax; abdomen gene- 
rally opaque and very densely punctulate. Eastern America. 
Pseudolathra 
Hind tarsi long, the two basal joints more elongate......:.seseceseeeee 21 - 
21 — Hind tarsi stout toward base, the fifth joint much elongated, the an- 
