ou PROCEEDINGS OF THE NATIONAL MUSEUM. VOL, 62. 
slightly produced, truncate at the apex, with a narrow V-shaped 
incision at the middle, and three short, blunt, equidistant teeth on 
each side; the portion in front of the marginal groove with two large, 
acute, distant teeth at the apex. LElytral epipleura narrow. Meta- 
sternum more coarsely and densely punctured than the abdomen, and 
nearly truncate in front. Prosternum feebly, arcuately emarginate 
anteriorly; prosternal process about four times as wide as the coxal 
cavities; sides slightly expanded behind the coxae, truncate at the 
apex with the angles broadly rounded; episternum flat, somewhat 
rectangular, slightly more attenuate anteriorly. Prothoracic epi- 
pleura wide and nearly flat, with a deep, narrow groove behind the 
antennal groove; lateral margin rectangular, becoming acute poste- 
riorly; antennal groove deep and wide, following the suture between 
the episternum and epipleura, extending into the latter to the tibial 
groove and parallel to the lateral margin. 
Length, 3.1 mm.; width, 2.6 mm. 
Type locality.—Piedras Negras, Costa Rica. 
Type.—Cat. No. 25105, U.S. N. M. 
Described from a unique female in the National Museum Collec- 
tion labeled “‘ Piedr. Negras, Costa Rica, Coll. Schild and Burgdorf.”’ 
PACHYSCHELUS CENTRALIS Waterhouse. 
Pachyschelus centralis WATERHOUSE, Biol. Centr.-Amer. Coleopt., vol. 3, pt. 1, 
1889, p. 148. 
This is one of the most rotund species and was described from 
material collected by Mr. Champion at El Tumbador, Guatemala, 
at an altitude of 2,500 feet. It is not represented in the National 
Museum Collection, and it has been given its position in the key solely 
upon the characters given in the original description. 
PACHYSCHELUS OVALIS Waterhouse. 
Pachyschelus ovalis WarERHOUSE, Biol. Centr.-Amer. Coleopt., vol. 3, pt. 1, 
1889, p. 140. 
Described from material collected at Rio Hondo, British Honduras; 
San Geronimo and Chiacam in Vera Paz, and El Tumbador, Guate- 
mala, without designating any type locality. No specimens have 
been examined of this species, and it is placed in the key from the 
characters given in the original description. 
PACHYSCHELUS ASTRAEUS Waterheuse. 
Pachyschelus astraeus WATERHOUSE, Biol. Centr.-Amer. Coleopt., vol. 3, pt. 1, 
1889, p. 147. 
This species was described from material collected at Cordoba and 
Atoyac in Vera Cruz, Mexico. It is not represented in the National 
Museum Collection, and has been placed in the key from the char- 
acters given in the original description. 
