118 RHYNCHOPHORA. 
not longer than the second and third together. None of these basal joints is relatively 
as long as in the Platypodides, and a notable difference is found in the flattened second 
and the strongly bilobed third tarsal joint. The antennal club is flattened, oblong-oval, 
rather small ; it presents traces of two curved sutures, which Duges has overlooked. The 
eyes are rounded oval. I have not been able to examine the mouth-parts, which, from 
Dugés’s very poor figures, appear to be of Scolytid or Cossonid, rather than of Platypid 
type. The prothorax has a deep excavation on either flank, and appears strongly 
constricted before the middle when seen from above; it has no side-margin. The 
elytra are truncate at the base, and do not overlap the prothorax. The anterior cox 
are widely separated and not large; the mesosternum is large, and its side-pieces ascend, 
as in Platypodides, between the prothorax and elytra; the metasternum is long. The 
mesonotum is not carinate. 
The relationship of the Scolytine to Chapuisia is best seen in two genera—Coptonotus, 
Chap., and Craniodicticus, Blandf., in both of which the form of the body is curiously 
similar. Coptonotus has, however, a shortly rostrate head, a 7-jointed funiculus, and 
non-flattened articulate club. Craniodicticus a rounded head, a 5-jointed funiculus, 
and articulate club. Neither presents any well-marked trace of the apical tibial 
mucro; the first tarsal joint, short in Craniodicticus, is barely as long as the third and 
fourth together in Coptonotus, and the third is not bilobed in either genus. Of these two 
genera Coptonotus appears to be the more nearly allied, and serves to link Chapuisia 
with Hylastes and Phicoborus. 
One species of Chapuisia is known, of which examples in all stages were found by 
Dugés in a terebinthaceous tree in Mexico. 
1. Chapuisia mexicana, (Tab. V. figg. 6; 6 a, anterior leg.) 
Chapuisia mexicana, Dugés, Ann. Soe. ent. Belg. xxix. 2, pp. 56-60, t. v.* 
Hab. Mexico, Guanajuato ! ([/6ge). 
Two examples have reached us from Herr Hoge. ‘There is a third in my collection 
from that of A. Deyrolle. A curious feature of the insect is to be found in the patches 
of opaque white scales at the base and sides of the elytra and on their declivous portion. 
Subfam. SCOLYTINA. 
Scolytides vrais, Lacordaire, Gen. Col. vil. p. 355. 
The Central-American Scolytine are divisible into four groups: compared with 
the six given by Lacordaire they are modified by the union of the Scolytides vrais 
(s. str.) with the Camptocérides, and of the Phlceotrupides with the Hylesinides. 
The Eutomides have long since been excluded, and relegated to the neighbourhood 
of Cis. A new group, the Hexacolides, is proposed for certain genera unknown to 
Lacordaire, and withdrawn from the Tomicides and Hylesinides; its formation 
