344 STAPHYLINIDZ. 
XANTHOPYGUS. 
Staphylinus, Fam. VII, Erichson, Gen. et Spec. Staph. p. 363. 
Xanthopygus, Kraatz, Ins. Deutsch. i. p. 539. 
This genus is peculiar to Tropical America, where it is generally distributed, about 
twenty species being previously known. 
1. Xanthopygus sapphirinus. 
Staphylinus sapphirinus, Er. Gen.et Spec. Staph. p.364!; Sharp, Trans. Ent. Soc. Lond. 1876, p. 126°. 
Hab. Muxico, Mirador (Hége); Guatemata, Zapote, San Gerénimo, Senahu, and 
Purula in Vera Paz (Champion) ; Panama, Bugaba, Volcan de Chiriqui 2500 to 4000 
feet (Champion).—Soutn America !, Amazons valley ?. 
The specimens of this species known to me from our region are not numerous, only 
about a dozen, and are all smaller than the Amazonian examples, and have the head 
and thorax less punctate. They show, as do also X. solskyi and X. viridipennis, great 
variation in the colour of the elytra, which is either violet, blue, or green, and the two 
examples from Mexico have the extreme base of the penultimate segment of the hind 
body black. The species may readily be distinguished from all the varieties of X. solskyt 
by the male characters, and by the piceous labrum and the less pallid clypeal mem- 
brane, which is less definitely marked off from the front of the head. 
2. Xanthopygus solskyi. 
Xanthopygus solskyi, Sharp, Trans. Ent. Soc. Lond. 1876, p. 126°. 
Hab. GuaTEMALA, Panima in Vera Paz (Champion); Nicaraeua, Chontales (Belt) ; 
Panama, Bugaba, Volcan de Chiriqui 2500 to 4000 feet (Champion)—Sourn AMERICA, 
Amazons}, 
Erichson’s S. calidus from Colombia I have not been able to identify in the absence 
of any reference to the male characters by the German author ; it may prove to be either 
this species or X. viridipennis, or another closely allied species. Only a single example 
of X. solskyi has been found in Guatemala, which is probably the northern limit of its 
range. 
3. Xanthopygus viridipennis. 
Xanthopygus viridipennis, Sharp, Trans. Ent. Soc. Lond. 1876, p. 428’. 
Hab. Nicaracua, Chontales! (Janson); Panama, Bugaba, Volcan de Chiriqui 
(Champion). 
This species, as well as X. solskyi, has been found in some numbers, but both are 
apparently much less common than X. xanthopygus. They are found about decaying 
vegetable matter. 
