Casey — A Revision of the American Paederini. 133 
rounded and not acute as in the preceding species, the shallow and 
broadly rounded apical sinus nearly similar, fully three-fifths as wide as 
the apex. Length 4.4 mm.; width 0.65 mm. Virginia, Tennessee, 
Mississippi (Vicksburg) and Texas (Austin)........-filitarsis n. sp. 
4 — Body slender, polished, pale yellowish-testaceous in color, the abdomen 
sometimes slightly piceous with the apex broadly rufescent; head 
parallel at the sides, the angles obtuse but only slightly rounded, the 
base arcuate, the punctures fine and very sparse; antennae as long as 
the head and prothorax, rather slender and only very feebly incrassate 
distally; prothorax slightly elongate, only just visibly narrower than 
the head, the sides subparallel and nearly straight, the apical angles 
very narrowly, the basal broadly, rounded; surface with a few coarse 
punctures forming an arcuate series near the sides anteriorly and 
others forming the usual series bounding the median impunctate area; 
elytra distinctly elongate, subparallel, two-fifths wider and a third 
longer than the prothorax, the punctures fine and extremely sparse, 
arranged in a few series as in the preceding species; abdomen slightly 
narrower than the elytra, more minutely and more closely punctulate 
than in jilitarsis and the other species. Male not at hand; female with 
the sixth ventral very broadly and feebly rounded behind. Length 4.0 
mm.; width 0.62 mm. Arizona (Tucson)...............-litnaria Lec. 
The species described by Say under the name Lathrobium 
dimidiatum, is improperly identified in our cabinets, the 
name being applied to the species called filzéarszs in the table. 
Filitarsis appears to be rather inconstant in other respects 
than the coloration of the elytra, for example in the conver- 
gence of the sides of the head behind the eyes, some examples 
having the sides parallel without regard to sex. The male 
sexual characters, are, however, virtually constant, and so no 
division can be attempted. Dr. Sharp records dimidiata from 
Mexico, but the species is probably not the same, although 
congeneric, as may also be the case with pusilla Shp., from 
Tabasco. 
Lathrobiella n. gen. 
This genus is the most extensive of the plicate Lathrobia 
and is composed of small species, frequently closely allied 
among themselves. It has the same geographical distribution 
as Lathrotaxis, although inclined to a more northern range, 
and, up to the present time, is wanting as far as known in 
California, where Lathrotaxis is represented by a single very 
isolated species, atronitens belonging to the Sonoran fauna 
