6 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62. 
anterior margin broadly arcuately emarginate, with an obsolete lobe 
at middle; base transversely truncate to near middle of the elytron, 
then feebly sinuate and turning obliquely backward to the scutellum, 
in front of which it is narrowly rounded; surface with a broad, 
shallow depression near the posterior angles, irregularly and coarsely 
punctured, similar to that of the head; mtervals smooth. Scutellum 
obsolete, punctiform. Elytra moderately convex, slightly wider 
than pronotum at base; humeral angles broadly rounded; sides par- 
allel to behind the middle (rather strongly sinuate at basal third), 
then arcuately attenuate to the tips, which are conjointly narrowly 
rounded, with the lateral margins entire; each elytron with a broad, 
rather deep depression at the base, and a similar one behind the 
humerus, close to the lateral margin; surface without lateral cara, 
rather densely and irregularly punctate, the punctures very coarse 
at the base, becoming obsolete at the apex, and with a tendency of 
forming striae on the disk, between which is a series of smaller 
punctures; intervals smooth. Abdomen beneath coarsely and rather 
sparsely punctate, the punctures shallow and open on the one side, 
and becoming striolate at the sides of the first segment; intervals 
finely and densely reticulate-striolate; last segment broadly rounded 
at apex. Prosternum coarsely and sparsely punctured; anterior 
margin broadly rounded; prosternal process broad, slightly expanded 
behind the coxal cavities, and broadly rounded at apex. 
Length, 3.25 mm.; width, 1.75 mm. 
Type locality —Turrialba, Costa Rica. 
Type.—Cat. No. 25093, U.S.N.M. 
Described from a single specimen collected by Messrs. Schild and 
Buredorf. 
In dissecting a number of specimens of various species in this genus, 
I find that it is the females that have the apical part of the abdomen 
armed with a series of small teeth, and not the males, as recorded 
by Waterhouse. Since he has used this character in the description 
of the males of his new species, the sexes should be reversed in all 
his descriptions in this genus. The males in this genus have the last 
‘abdominal segment entire, and sometimes produced into a short, 
acute spine at the apex. 
Genus PACHYSCHELUS Solier. 
Pachyschelus Sourer, Ann. Soc. Ent. France, ser. 1, vol. 2, 1833, p. 313. 
This is a very large genus and contains about 164 species, 16 of 
which are described as new in the present paper. This genus has a 
rather wide distribution, and reaches its highest development in 
South America, from where the type species of the genus was de- 
scribed. Of this large number of species, 7 have been described from 
the Indo-Malaysian Region, 2 from Madagascar, 1 from Africa, 5 
