Casey — A Revision of the American Paederini. 105 
to that of Domene. They are of more or less robust form, 
of small to moderately large size and are gradually pointed 
anteriorly, being widest at the elytra, with the prothorax and 
head decreasing in width, giving them a somewhat fusiform 
outline. The maxillary palpi are long and notably slender in 
the present genus, the fourth joint being unusually slender 
and aciculate, the antennae more or less long, slender and 
filiform, with the hind tarsi as in Lathrobium. The elytra 
are always larger and more closely punctate than in that 
genus, without trace of linear arrangement. The slender neck 
is undoubtedly a most significant and conclusive generic char- 
acter and Tetartopeus should in no wise be considered a sub- 
genus of Lathrobium. The species are rather numerous and 
very widely distributed over the holarctic regions of the earth, 
extending as far south in North America as Florida and 
Texas, but most abundant in the colder sections of the north- 
ern continents. Those represented by material in my cabinet 
may be readily known as follows: — 
Elytra at least as long as the prothorax, and, in all but very rare cases, de- 
CIACOLY BOD BOE as ees cacuss ceded boos pede a wabsdianan Weeks eneabeaaighe 2 
Elytra shorter than the prothorax, the body more parallel........- eeccce 16 
2—Elytra red or piceous, sometimes clouded with blackish toward base or 
pear the suture, never abruptly paler at apex or at the external apical 
angles..... nbickimeeeh aw nnaeses Chu ecie ee ee kms iewke Kae pehite ad beikelae ee 3 
Elytra biack or blackish, with the external apical angles more or less 
abruptly pale, the pale tint sometimes extending across the apex.... 9 
Elytra intense black throughout; the entire body black, the legs dark....14 
5 -— PFOUROLAk COOT: DIRGK iy dicen don ssibiaeuresdawickecehon sabe suveceunes & 
Prothorax pale testaceous, similar in color to the elytra............ ercce 8 
4 — Head parallel or only very feebly and sii ay narrowed behind the 
eyes and then only in the female.......... Siu hdenpee secgce O 
Head very obviously narrowed behind the eyes in | both: sexes. to ew 
5 — Prothorax not very coarsely and unusually sparsely seis. Body 
moderately stout and convex, polished black, the elytra dark piceo- 
rufous; head parallel at the sides behind the eyes, the base semicircu- 
larly rounded; eyes at three-fourths more than their own length from 
the base, measured on the median line as usual; antennae scarcely as 
long as the head and prothorax and rather thicker than usual, the me- 
dial joints about two-thirds longer than wide; prothorax very much 
wider than the head, oblong, broad, only slightly longer than wide, 
highly polished, very sparsely and somewhat inconspicuously punctured ; 
elytra quadrate, parallel, a third wider and about a fourth longer than 
the prothorax, fully as long as wide, the punctures rather close-set 
