LAMPROPYGUS. 347 
Staphylinus, and Xanthopygus, and must be located near the latter genus, from which 
it differs by the fact that the ligula is less emarginate, and by the great diminution of 
the plane surface of the front margin of the thorax at the anterior angles; by these 
characters it makes some approach to Philonthus, in which genus Erichson located 
the species known to him, while the species of Xanthopyqus, as I now restrict the term, 
he placed in Staphylinus. There is still much discrepancy between L. analis and L. 
bicolor and the typical species of the genus, and it is probable that it will still require 
further analysis. The genus includes, besides the species here mentioned, Philonthus 
bicolor, Er., and an undescribed species from Monte Video. It is no doubt confined to 
the South and Central American regions. 
1. Lampropygus xanthopygus. 
Staphylinus xanthopygus, Nordm. Symbol. p. 45°. 
Xanthopygus abdominalis, Har. Mun. Cat. ii. p. 597. 
Hab. Mexico (Flohr), Guanajuato, Cuernavaca (Sallé), Oaxaca, Plan del Rio (Hége) ; 
GUATEMALA, San Gerénimo (Champion). 
The male of this species has the front tarsi a good deal more dilated than the female ; 
the penultimate ventral segment has on the middle a large depression in which is 
placed a series of suberect, elongate ciliz, and is armed on each side with four elongate 
erect black sete placed in an irregular row, the outer one quite at the outer side, the 
inner one near the bristles arising from the fovese; the terminal segment is broadly 
and rather deeply emarginate, and bears on each side four very long erect black 
sete. 
Although the following species is usually named S. xanthopygus, Nordm., there can 
be no doubt that Nordmann’s description applies rather to this. Hodge found a fine 
series at Oaxaca; from Guatemala only one specimen has been obtained. 
2. Lampropygus cognatus. (Tab. VIII. fig. 17.) 
Philonthus xanthopygus, Er. (ex parte), Gen. et Spec. Staph. p. 496°. 
Staphylinus xanthopygus, Sharp, Trans. Ent. Soc. 1876, p. 131°. 
Xanthopygus cognatus, var. minor, Sharp, 1. c.° 
Hab. Mexico, Oaxaca (Hége), Cordova (Sallé); Guatemata, Las Mercedes 3000 feet, 
Pantaleon 1700 feet, Chiacam and Chacoj in Vera Paz (Champion); Nicaracva, 
Chontales (Janson, Belt); Panama, Bugaba, Volcan de Chiriqui (Champion).—Soutu 
America, Amazons valley ? °. 
This species though very similar to L. xanthopygus is distinguished by important 
characters. 
The male has no fovea or erect ciliz on the penultimate ventral segment, and has 
only three erect sete on each side; this latter is also the number existing on each side 
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