Casey — A Revision of the American Paederini. 131 
prothorax very slightly wider than the head, but little longer than wide, 
the sides parallel and nearly straight, the apical and basal angles nar- 
rowly and subequally rounded, convex, the punctures fine, very sparse, 
coarser in a more close-set series along the median smooth line, the 
series wholly unimpressed; elytra slightly elongate, a fourth wider and 
longer than the prothorax, the sides just visibly diverging throughout 
and nearly straight, the punctures fine, rather sparse, arranged in some- 
what close-set, broadly impressed series, except toward tip where 
all sculpture becomes very feeble; abdomen broad, as wide as the 
elytra. Male unknown; female with the sixth ventral narrow, evenly 
rounded at tip. Length 4.6 mm.; width0.88mm. Colorado (Greeley). 
filicornis n. sp. 
A single specimen only of this species was received from 
Mr. Wickham some years ago. 
Linolathra n. gen. 
The comparatively few known species of this genus have a 
very distinct habitus, due to their small size, narrow and 
rather convex parallel form, polished surface, with very coarse 
and sparse elytral punctures, and distinct but not close-set 
abdominal sculpture. They are strongly suggestive of Dac- 
nochilus and are really much more closely related to that 
genus than to Lathrotaxis or Lathrobiella. The four species 
represented in my cabinet may be readily known as follows : — 
Head atid QDGOmMeGR: DIAG) ini oc cc sacc cc seccis padece scnsdecs specsacensace - 2 
Head and abdomen pale in COlOL,.... ...e cee vccevcccccccscseceseseveses 4 
2— Tip of the abdomen rufous. Body parallel; prothorax, elytra and legs 
pale and bright rufous, the elytra not definitely darker toward base; 
head scarcely as long as wide, the sides subparallel and feebly arcuate, 
the angles well rounded; base subtruncate, the neck scarcely half as 
wide as the head; eyes convex, at rather less than twice their own 
length from the base, the punctures somewhat coarse, very sparse; 
antennae moderately thick, very feebly incrassate, distinctly longer than 
the head and prothorax, the medial joints less than half longer than 
wide; prothorax small, slightly elongate, somewhat narrower than the 
head, the sides parallel and feebly arcuate; anterior angles distinct, the 
basal rounded, the punctures moderately coarse, forming one or two 
shorter curved lateral series and a well marked close series along the 
median impunctate area, the latter series impressed toward base; elytra 
guadrate, parallel, much wider than the head, a third wider and nearly 
a fourth longer than the prothorax, the punctures coarse, impressed, 
sparse, disposed in three or four series, the sutural being very widely 
separated from the next discal series; abdomen slender, much nar- 
