Casey — A Revision of the American Paederini. 149 
continually transported in articles of commerce, as there is 
no variation, even of a varietal nature, to denote long estab- 
lishment in any particular locality, but, whether originating 
in America or Europe, is a question not yet solved; the 
probabilities are that the genus was originally exclusively 
American. The three species in my cabinet may be readily 
known as follows from the male: — 
Male with a fringe of short black spinules in median third of the fifth 
ventral. Body moderately slender, subfusiform, feebly convex, pale 
brown throughout and dull in lustre, the head black; punctures fine and 
extremely close-set, subgranuliform on the elytra; head rather wider 
than long, subparallel at the sides, the angles rather broadly rounded; 
eyes at not quite their own length from the base; antennae somewhat 
longer than the head and prothorax, the latter slightly wider than the 
head, a little wider than long, the sides parallel and feebly arcuate; 
base and apex broadly, equally and subevenly arcuate, the angles obtuse 
but only slightly rounded; median smooth line obsolete; elytra 
quadrate, parallel, two-fifths wider and longer than the prothorax; 
abdomen parallel with the sides broadly arcuate, narrower than the 
elytra throughout. Male with a large subparabolic emargination, 
much wider than deep, occupying the entire width of the sixth ventral, 
the surface along each side of the sinus broadly, feebly impressed and 
bearing a dense tuft of long pale hairs; apex of the fifth transversely 
truncate, the spinules in median third turned inward. Length 3.7 
mm.; width 0.7 mm. America (from the Atlantic to the Pacific) and 
Europe. [= Metaxyodonta alutacea and quadricollis Csy.]. 
. ochracea Grav. 
Male without trace of median spinules at the apex of the fifth ventral.. 2 
2 — Form similar to ochracea, the size somewhat smaller; coloration, lustre 
and sculpture similar; head similar to that of ochracea, the eyes large 
and at distinctly less than their own length from the base; gular 
sutures similarly strongly impressed but rather less approximate, 
being well separated; prothorax equal in width to the head, similar in 
form to that of ochracea; elytra large, quadrate, parallel, two-fifths 
wider and longer than the prothorax; abdomen arcuate at the sides 
behind the middle, scarcely narrower than the elytra. Male with the 
fifth ventral very feebly sinuate toward the middle of the apex; sixth 
with a large parabolic sinus, wider than deep, occupying the entire 
width, the surface at the sides not impressed, the lateral edges of the 
sinus bristling with very long close-set hairs. Length 2.9 mm.; width 
0.62 mm. Southern California,— Mr. Fall............simplex n. sp. 
Form more slender, the size still smaller, darker and more piceous in 
color with the head black, but similarly dull in lustre and densely 
punctulate; head fully as long as wide, parallel and nearly straight at 
the sides, the angles similarly moderately rounded; eyes much smaller, 
at distinctly more than their own length from the base; antennae more 
slender and much shorter, not as long as the head and prothorax ; 
