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[November 1883 BULLETIN BROOKLYN ENTOM. SCC. VOL. VI. 75 
rages 
OMUS, Esch. 
(Omus—Cruel.) 
Black, more or less opaque (one submetallic), wingless, head nearly 
square, eyes small, palpi of equal length, the labial with the first joint 
very short, third long ; antenne inserted in front under a_ prolongation 
before the eyes ; mandibles very long, acute, the right with two teeth, 
the left with three ; thorax flattened ; elytra convex; legs stout, short. 
o\.——Has the three joints of anterior tarsi dilated (more inwards) 
and densely spongy beneath ; last ventral segment deeply emarginate at 
the middle. 
© .—-Has the last ventral segment ova] at tip and entire, 
The larva, fig. 122, described by Dr. Horn. 1. c. p. 31, is yellow- 
ish-white ; head piceous ; pruthoracic scute pale castaneous ; has eight 
eyes, two pairs large, two pairs small ; antennee with the first three joints 
equal, fourth shorter ; maxillary palpi with joints one and three equal, 
second shorter. Length in normal flexed position, 20 mm, 
This genus is also nocturnal, found on the Pacific Slope from Van-— 
couver Island to Monterey Co., California. They hide under pieces of 
wocd and may easily be baited by placing finely chopped meat near , 
small pieces of board, under which they can be found the next day. 
Horn, Trans. Am. Ent. Soc., v- 234, (on sexual characters); Trans. Am. Ent. 
Soc., vii. 31, (description of the larva of Omus Dejeanii), Hy. Edwards, Psyche, i, 73, 
(on the localities and habits of Omus.) 
TABLE OF OMUS. 
J.—Lateral margin of thorax obliterated posteriorly, not attaining basal margin. 
Surface black. 
‘Thoracic margin distinctly reflexed. 
byte toyeolatcyand ;opagie .. 1 svar. eee ete ei eigeeae ale Dejeanii. 
Elytralsimply punctateand shinine. 4) S4jhaecn sees. eee. Edwardsii, 
Thoracic margin extremely feeble. 
aie), endive woeetenlbaneli7 jOUENOIANE Go We ha ye Audouinii. 
Surface bronzed, 
Elytra broadest near the apex, form nearly parallel ......... .submetallicus. 
IJ.—Lateral margin of the thorax attaining the basal margin. 
Elytra moderately coarsely punctured. 
MEO Rasa Sal vase lye emo ats. ech aan aan ra MEALS ak ...-Hornii, 
Thorax narrowed behind, rugulose.......... LBS el A A a el AUN californicus, 
Thorax narrowed behind, comparatively smooth. 
loon smoovie, Mailbyqoheol torts uy ea aan Vi he sequolarum., 
Honmyslend em labnuinn neariya tuincate wena «ate iy ema Lecontei, 
EMTS WIAA Fonyorouln warponmmncetnvecdly Sk Ak Ae Sian levis. 
