TOMICIDES. 185 
Club subtunicate, its sutures not concentric on the outer face. Maxillary 
armature spinose. Elytra impressed and toothed at apex, sutural stria 
impressed. Sexes not markedly dissimilar. Species phleophagous. . . Tomiod. 
Club tunicate, its sutures concentric on the outer face. Maxillary armature 
setose. Sutural stria feeble. Middle and posterior tarsi retractile. Males 
dwarfed and subapterous. Species wood-boring . . . . . . . . . Xylebori. 
Club with transverse or curved sutures, subequal on both faces. Tibiz slender, not 
coarsely serrate ; tarsi not retractile. 
Funiculus with six joints. 
Prothorax oblong, its anterior opening very oblique. Body subelongate, the 
elytra mucronate at apex . . . . Lo ~ . 6 « « HAylocuri. 
Funiculus with four or five joints *, outer face of the tibive not tuberculate. 
Prothorax subhemispherical. Body not elongate, usually with close-lying 
hairs or scales. Elytra not sulcate at apex . . . . . . Cryphah. 
Prothorax oblong, with oblique opening. Body subelongate, rarely pilose or 
squamose. Elytra usually with an apical sulcus. Anal aperture some- 
times ventral . 2. 2. 1. 1 we ee ew ee) Pltyophthorin 
Funiculus very short, with one to three joints; anterior tibie subprismatic, the 
outer surface porcate or with a row of tubercles external to the dentate 
margin. 
Head deeply retracted, sometimes entirely concealed except from below. 
Elytra with no general pilosity, smooth, with extremely fine, rarely 
moderate punctuation, non-striate, except sometimes along the suture. 
Anal aperture ventral. Species wood-boring . . . . . . . . « Corthyli. 
Subgroup I. TOMICI. 
Tomicide, Hichhoff, Rat. Tom. p. 210. 
The Tomici inosculate with the Pityophthori through Pityogenes, a genus not found 
in our region, and with the Xylebori through Dryocetes. Three genera are found in 
Central America :— 
Tibi subtriangular, truncate at apex; middle and hind tarsi not retractile. 
Prothorax declivous and asperate in front, behind punctate. 
Mentum very elongate, slipper-shaped, constricted behind the middle ; ligula 
inserted about the middle, for its full width. Club with the sutures 
angulate, sinuate, or transverse (subcircular in 7. concinnus alone). Elytra 
excavate or retuse, multidentate. Species living on Conifere. . . . . Tomicus. 
Mentum not very elongate, parallel-sided, narrowed at the base ; ligula very 
small, inserted narrowly at the apex. Sutures of the club concentric. 
Elytra with at most one or two teeth each. Species not living on Conifer. Xylocleptes. 
* Examples of small species of Hypothenemus appear (? occasionally) to possess a three-jointed funiculus. 
This feature of depauperization is of no systematic importance. 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 6, January 1898. 2 BB 
