10 MISC. PUBLICATION 341, U. S. DEPT. OF AGRICULTURE 
they are so nearly lateral that the value of the character is scarcely 
lessened. 
In Pantomorus leucoloma, P. peregrinus, and P. godmani, there 
are transverse aciculations on the metasternum and abdominal ster- 
nites. This type of sculpture in feebler form is found in some of the 
other species also. The gamogenetic species (1. e., those of the sub- 
genus Phacepholis) as a general rule have the hind margin of the 
prothorax in side view more strongly angulate opposite the elytral 
humerus, the nasal plate feebler, the setae at the latero-apical angle 
of the rostrum more numerous, the dorsal comb of the hind tibia 
shorter, and the spermatheca broader and more feebly sclerotized 
than in the parthenogenetic species. In the latter the spermatheca 
is well sclerotized and, except in lewcoloma and peregrinus, more or 
less elongated basally (fig. 4, A, B, C, F); it is not elongated in the 
subgenus. Phacepholis (fig. 4, @. ET. The median line of the pro- 
notum in side view is nearly. flat except in certain species of Phace- 
pholis, in which it is rather strongly convex. In leucoloma, pere- 
grinus, and godmani there is a well-defined glabrous spot on the 
mesepisternum, and a broad line along the middle of the abdomen 
where the vestiture is sparser than at the sides. A somewhat similar 
arrangement of the abdominal vestiture is found in the males of some 
species of Phacepholis. 
The term “‘combs” refers to the rows of spinules toward and at the 
apex of the hind_tibia (fig. 2, A to J). In some species the upper 
and lower apical angles of the tibia are connected by two distinctly 
separated combs, the intervening space being called the corbel plate 
(“corbel closed” of curculionid literature) (fig. 2, A, C). The comb 
nearest the tarsal cavity is called distal comb, the other one, anterior 
comb. In Pantomorus the distal and anterior combs are moderately 
to narrowly separated, the corbel plate being correspondingly wider 
or narrower; or there may be only a single ‘comb, the distal, and no 
corbel plate “evident (“corbel open” of curculiomid literature) (fig. 
2,B,D). Inthe open corbel traces of the anterior comb and corbel 
plate can sometimes be detected on the anterior face of the tibia next 
to the distal comb. From the upper apical angle of the tibia the 
distal comb extends a greater or less distance toward the base of the 
tibia, and this extension is called dorsal comb because in side view it 
appears to rise from the dorsal edge of the tibia (fig. 2, A to D). 
These tibial structures are important in the higher classification of 
some Curculionidae, but in Pantomorus they are often hardly of sub- 
generic value. The “subapical area” is a somewhat vaguely defined 
region on the dorsum of the rostrum just posterior to the nasal plate; 
it is often slightly impressed, and is usually more finely sculptured 
than the remainder of the rostrum, and clothed with smaller and 
differently colored scales. The mandibular prominence to which the 
deciduous appendage is attached is called support of deciduous piece, 
or merely support. The length of the rostrum is the shortest distance 
between the front margin of the eye and the apex of the rostrum, 
excluding the mandibles. The point on the head attained by the 
scape 1s shown when it is lying in the scrobe and touching the lower 
margin of the eye; the scape is said to reach or exceed the hind 
margin of the eye, or to “exceed the eye,” when it reaches or exceeds 
a downward extension of an imaginary line, the shortest. line, connect- 
