390 TROGOSITIDA. 
hind-body, black, with a broad pale mark across the middle; only obsoletely punctured, 
the black apical portion impunctate and shining. 
The unique example found of this curious little insect is probably a female. 
Subfam. TEMNOCHILIN A. 
CORTICOTOMUS, gen. nov. 
Corpus parvum, eylindricum. Oculi minus fortiter granulati. Antenne undecim-articulate ; clava maxima, 
laxissime articulata. Mandibule breves, superne fere curvate. Tibize subinermes, anteriores et inter- 
mediz ad apicem denticulatze. 
This genus is proposed for some small Trogositids having somewhat the appearance | 
of Corticeus (Hypophlceus), a well-known genus of Heteromera. It should, I think, 
come near Airora, which it somewhat resembles in the peculiar form of the head and 
in the mouth-parts, but from which it departs greatly by the large club of the antenne 
and the comparatively feeble legs. The head above is somewhat hollowed, and when 
looked at in profile it is seen that the mandibles are to a slight extent directed 
upwards. The clypeus appears to be straight in front, but on examination it is seen 
that there is an extremely short, broad, truncate lobe in the middle, and to this the 
broad labrum is attached ; it is slightly emarginate. The eyes are transverse, placed 
quite at the sides of the head. The mouth is placed quite at the front of the head. 
‘The short broad mentum is vertical in its direction. ‘The palpi are short, rather stout, 
subacuminate at the apex. ‘The prosternal process is abruptly bent upwards, behind 
the cox; the metasternum is elongate. The front tibiz are short, very slender at the 
knee, but much broader at the extremity, and on the most prominent part they are 
feebly bidenticulate, and are armed at the apex with a stout curved mucro; the middle 
tibie bear three denticles at the extremity, and one or two very minute asperities in 
the middle. All the tarsi are slender, joints 2—4 elongate, subequal. Front coxe 
rather large, with the trochantins visible, the middle and hind coxe only slightly 
separated. 
Corticotomus has more the facies of Colydobius than of any other 'Trogositid I am 
acquainted with, but I cannot think it closely allied thereto, the mandibles being very 
different in the two; these organs in Corticotomus have a strongly curved acuminate 
extremity and a single small denticle placed near the base. 
1. Corticotomus basalis, sp.n. (Tab. XII. figg. 24; 24a, front tibia.) 
Subcylindricus, piceus, antennis articulis 1°-8™, pedibus elytrisque basin versus rufescentibus; capite protho- 
raecque crebre sat fortiter punctatis, subnitidis; elytris in parte basali subtiliter seriatim punctatis, 
punctis apicem versus minutissimis. 
Long. 4 millim. . 
Hab. Guatemaua, Las Mercedes, Mirandilla (Champion). 
