TESSEROCERUS.—CHAPUISIA. 117 
- This division includes at present 1’. delti, Sharp, and J. inermis, Guér.' The former 
only is known from Central America. 
5. Tesserocerus belti. (Tab. V. figg. 4,4; 4a, front: 5,2; 5a, front.) 
Tesserocerus belti, § 9 (lege 2 &), Sharp, Ent. Monthly Mag. xvii. p. 112°. 
Hab. Nicaragua, Chontales (Belt 1, Janson). 
This splendid species is by far the largest known member of the genus, and is 
equalled in size by a few species only of Crossotarsus and Platypus. As Dr. Sharp has 
pointed out, it differs from the other known Tesseroceri in that the scape of the antenne 
is much produced in both sexes beyond the insertion of the funiculus. It is also 
separated by the structure of the elytra. The strie are very shallow, and the inter- 
stices are not alternate, except at their extremities; the bases of the third and fifth 
are wider, subelevated, and granulate in both sexes. Towards the apex of the elytra 
the interstices are curved outwards and project, terminating in the male to form a 
superior margin to the apical depression, incomplete at the suture, and with a serrate 
edge, of which the teeth correspond to the extremities of the alternate interstices; the 
inferior apical border is explanate, but the postero-lateral angles are rounded and not 
produced. In the female the first and succeeding alternate interstices terminate in 
short spines; the others are rounded at their junction with the declivity, which is 
striate and granulate in both sexes. 
The elytral structure is closely related to that of 7. inermis, Guér. 
Several examples were taken at Chontales by each of its captors. 
Group CHAPUISIIDES. 
This group contains at present but a single genus, Chapuisia, of which the sole 
representative is one of the most puzzling species yet described among the Scolytide. 
CHAPUISIA. 
Chapuisia, Dugés, Ann. Soc. ent. Belg. xxix. 2, p. 58 (1885). 
The structure of this curious insect has been very fully dealt with by Dugés, but 
without much reference to allied forms. In some points, in the rounded head, eyes, 
and thoracic sculpture, it has a strong likeness to certain Cossonidee. It is especially 
allied to the true Platypodides in the structure of the legs; the anterior tibiz are 
roughly scabrous externally, and are produced at the upper apical angle into a strong 
recurved uncus, which points directly backwards; the middle and posterior tibiee are 
flattened, inconspicuously serrate on the upper border, and produced into a short and not 
very distinct mucro above the tarsal articulation. The first joint of the anterior and 
middle tarsi is as long as all the succeeding joints, that of the hinder tarsi, however, is 
