AMERICAN COLEOPTERA. 41 



insect was in a small vial and moved quickly. It gave out light con- 

 spicuously from the head, feebly from the anal end, and still more so from 

 about the base of the abdomen. The light seen in the head, though 

 visible in the dark as a round spot, yet when taken into a room obscurely 

 lighted was invisible from above ; but when the insect was suddenly 

 thrown upon its back a light no larger than a pin point was seen just 

 about the junction of the head and prothorax." 



C ENOPHEKGrS n. g. 



I have established this new genus upon a small Californian species, 

 which greatly resembles in appearance Mastinocerus fexanus, but differs 

 by the antennje as long as the head and prothorax ; the prothorax a little 

 longer than wide, with the lateral edge distinct only behind the middle, 

 and quite obliterated in front. The maxillary palpi are elongate and 

 slender, with the last joint long and cylindrical. The seventh ventral 

 segment is more broadly emarginate, and the eighth comparatively larger. 

 In all other respects it closely resembles 3J. texinius, except that the 

 sculpture is finer. 



C debilis. — Elongate, blackisli pioeous, punotulatc and pubescent. Pi-o- 

 thorax not as wide as the head, longer than wide, disc tiattened towards the base, 

 apex truncate, sides parallel, base and hind angles strongly rounded ; testaceous, 

 piceous near the base. Elytra flattened, half as long as the abdomen, finely 

 scabrous-punctate, sides somewhat rounded with a' submarginal elevated line from 

 before the middle nearly to the tip. Legs and last segment tinged with testaceous. 

 Length 4. .5 mm. 



California ; two specimens ; Dr. Horn. The second and third joints of the 

 antennae are short and without branches ; the branches of the other joints 

 are from one and a half to twice as long as the joints ; in Miixti/ioirnm 

 they are about four times longer than the joints ; 9 unkn(jwn. 



TYTTIIOXYX Leo. 



The well-known but not al)un(laiit species which is the type of this 

 genus, is of somewhat difficult location. Its appearance would indicate a 

 relatio iship with the Malthini group of Telephorida;, but after a careful 

 study of its characters I am inclined to believe that its true position is 

 near Maafinorerus and Cenophenr/u.<<, with perhaps a closer tendency 

 towards Drilus than is exhibited in those genera. 



The characters have been sufficiently given l)y me in other places to 

 permit of the easy recognition of this genus, but in order to substantiate 

 the opinicm above expressed it is now necessary to go into greater details. 



Head broader than long, deflexed, eyes small, rounded, convex, promi- 

 nent, finely granulated ; epistome rounded in front, connate with the 

 labrum and covering the mandibles which are curved, slender at tip, 



TRANS. AM. KNT. SOC. IX. (fi) MAV, ]S81. 



