18 PROCEEDINGS OF THE NATIONAL MUSEUM. vou. 62. 
PACHYSCHELUS TRAPEZOIDALIS Waterhouse. 
Pachyschelus trapezoidalis WaTERHOUSE, Biol. Centr.-Amer. Coleopt., vol. 3, pt. 
1, 1889, p. 151, pl. 7, figs. 24, 24a. 
Described from material collected by H. H. Smith, at Chilpan- 
cingo in Guerrero, Mexico, at an altitude of 4,600 feet. Mr. Water- 
house also records a specimen from Yolos, Mexico, which differs slightly 
from the type in having the pubescence more distinctly sandy yellow. 
The species has been placed in the key from the characters given in 
the original description. 
PACHYSCHELUS SIGNATUS Waterhouse. 
Pachyschclus signatus WATERHOUSE Biol. Centr.-Amer. Coleopt., vol. 3, pt. 1, 
1889, p. 150, pl. 8, fig. 17. 
The type locality for this species is Cahabon, Guatemala, and was 
described from material collected by Mr. Champion. It is also recorded 
from Chiacam and San Juan in Vera Paz, Guatemala, from mate- 
rial taken by the same collector. It is not represented in the Na- 
tional Museum Collection and has been given its position in the key 
from the characters given in the original description. 
PACHYSCHELUS ALBOPICTUS Kerremans. 
Pachyschelus albopictus KrrreMAns, Ann. Soc. Ent. France, vol. 63, 1894, p. 
421. 
This species was described from material collected in the refuse of 
tobacco imported into Paris, France, from Mexico. The species is 
unknown to the writer, and has been placed in the key solely upon 
the characters given in the original description. 
PACHYSCHELUS MEXICANUS, new species. 
Female.—Subtrapeziformis, distinctly longer than wide, strongly 
narrowed posteriorly, subopaque, piceous, with a violaceous tinge 
toward the lateral margins; surface moderately pubescent, the pubes- 
cence forming irregular designs on the basal half of elytra, and a 
more distinct transverse undulating fascia at apical third; beneath 
piceous. 
Head feebly convex and deeply embedded in the prothorax, rather 
feebly, longitudinally grooved from vertex to epistoma, the groove 
becoming deeper anteriorly; surface with a few large, shallow, obso- 
lete punctures, and sparsely clothed posteriorly with short cinereous 
hairs. Pronotum feebly convex, nearly four and one-half times as 
wide as long at middle, much narrower in front than behind, widest 
at base; sides attenuate from base to apical fourth, then broadly 
arcuate to the apical angles, which are rectangular; anterior margin 
deeply, arcuately emarginate for the insertion of the head; base nearly 
truncate, slightly sinuate at the elytral lobes; hind angles acute, pro- 
jecting slightly beyond the humeral angles of the elytra and fitting 
