Casey — A Revision of the American Paederini. 171 
ing slightly truncate toward the middle; fimbriate sides — making an 
angle of 45° with a transverse line — feebly curved. Length 3.9 mm.; 
width 0.7 mm. California (Sonoma Co.)..........+---languidum Csy. 
14 — Moderately slender, fusco-testaceous, the head and abdomen black, 
the flanks of the elytranubilously paler, the legs pale; anterior parts 
rather shining, the punctures small and not dense, fine and dense on the 
elytra and abdomen; head rather small, distinctly wider than long, the 
basal angles only moderately broadly rounded, the base broadly trun- 
cate, the neck a little narrower than usual, the sides behind the eyes 
straight and parallel, the eyes larger than usual, more than half as long 
as the distance thence to the base of the head; prothorax well devel- 
oped, fully as wide as the head or a little wider, almost as long as-wide, 
broadly rounded at apex, the sides parallel; elytra quadrate, a fourth 
wider and nearly one-half longer than the prothorax; gular sutures 
widely separated anteriorly, straight and gradually convergent thence 
nearly to the base, becoming very approximate, the space between them 
anteriorly densely and roughly sculptured, the intersutural area very 
feebly impressed. Length 3.9 mm.; width 0.8 mm. Arizona. 
apacheanum 2. sp. 
15 — Species inhabitating the regions immediately bordering the Pacific 
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Species inhabiting the high Sierras and eastward........eee.eeeee se ee ee 22 
16 — Prothorax more or less distinctly wider than long...... ..seee+eeeeel7 
Prothorax smaller, oblong, fully as long as wide and apparently longer, 
always narrower than the head; species frequently very smail in size, 
the neck marrower than Usual.....cccccccccscecccecccccocccscesccceedl 
17—Gular sutures very widely separated, the intervening space at the 
narrowest point wider than the maximum width of the third palpal 
JOINE. cree vccvecvescccccccvevcccee secs soccsesees voesceroccccscceseelG 
Gular sutures less widely separated, the intervening space slightly narrower 
than the width of the third palpal joint........ssse-se0ee- aia HeeKeRae 
18 — Body rather small and slender, feebly shining anteriorly with the head 
more alutaceous, dark testaceous in color, the head somewhat and the 
abdomen notably, darker, piceous, the elytra clouded with piceous; 
legs pale; head finely, rather closely punctate, convex, rather wider 
than long, very slightly wider than the prothorax, straight and parallel 
at the sides behind the rather small eyes, the basal angles broadly 
rounded; prothorax only just visibly wider than long, nearly straight 
and subparallel at the sides, sparsely punctate; elytra rather longer 
than wide, fully two-fifths wider and one-half longer than the prothorax; 
gular sutures broadly arcuate, feebly impressed, least separated at, or 
a little behind, the middle of the post-oral surface, which is rather 
finely and sparsely punctate. Median process in the apical sinus of the 
fifth ventral rather narrow, scarcely more than a third as wide as the 
sinus, broadly sinuato-truncate throughout its width at apex, its lateral 
angles well marked and rectangular, its sides short, rectilinear and 
parallel; surface with an arcuate series of long and widely spaced 
bristles at some distance before the process but otherwise unmodified; 
fimbriate sides of the segmental sinus distinctly curved, each having 
