PERIBZUM.—NEPHALIUS. 27 
PERIBAUM. 
About a dozen species of the restricted genus Peribeum are known, all ‘Tropical- 
American. The distinction from Nephalius is not very well-defined, consisting mainly 
in the thickened and pedunculate femora. | 
1. Peribeum villosulum. (Tab. III. fig. 16.) 
Peribeum villosulum, Bates, Trans. Ent. Soc. 1872, p. 176. 
Hab. Nicaragua, Chontales (Belt). 
.2. Peribeum bimaculatum. 
Pertbeum bimaculatum, Bates, Trans. Ent. Soc. 1872, p. 176. 
Hab. Nicaraeva, Chontales (Belt). 
NEPHALIUS. 
Also confined to Tropical America, and equally numerous in species with Feribeum. 
1. Nephalius suturalis. 
Nephalius suturals, Pascoe, Ann. & Mag. Nat. Hist. ser. 3, xviii. p. 479. 
Hab. Muxico, Yucatan!; Nicaraeua, Chontales (Belt)—_Sourn America, Venezuela. 
2. Nephalius nigriventris, (Tab. IV. fig. 2.) 
Nephalius nigriventris, Bates, Trans. Ent. Soc. 1873, p. 220. 
Hab. Mexico; Honpuras, river Sarstoon (Blancaneau) ; Nicaracua, Chontales (Belé). 
3. Nephalius rutilus. (Tab. IV. fig. 14.) 
Nephalius rutilus, Bates, Trans. Ent. Soc. 1872, p. 177. 
Hab. Nicaracva, Chontales (Belt). 
4, Nephalius rugicollis. 
Spherion rugicolle, Guérin, Icon. R. A. texte, p. 233°. 
Nephalius rugicollis, Bates, Trans. Ent. Soc. 1873, p. 177. 
Hab. Nicaraeua, Chontales (Belt).—Soutn Amurica, Colombia 1. 
5. Nephalius xestioides, (Tab. III. fig. 15.) 
Nephalius xestioides, Bates, Trans. Ent. Soc. 1872, p. 177. 
Hab. Nicaraevua, Chontales (Belt). 
This species is remarkable for the extreme narrowness of the metathoracic episterna, 
which are covered by the lateral rim of the elytra, except for a small portion near 
their base. With this structural peculiarity are associated tightly-closed middle 
acetabula and a cylindrical smooth thorax. In these characters it approaches the 
genus Apospherion, Bates (Trans. Ent. Soc. 1870, p. 275), from which it differs again — 
by the obsolete grooves and carinz of the antenne, which in Apospherion are. very 
highly developed. The similarity of the sternal structure, however, seems to me to 
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