298 STAPHYLINID ZA. 
one another; the four following each a little broader than its predecessor, subequal in 
length, each longer than broad; tenth joint elongate, acuminate, nearly as long as the 
two preceding together. Palpi yellow. Head black. Thorax broadly yellow at the 
margins, the disk infuscate. Elytra red, longer than the thorax, finely and sparingly 
punctate, shining. 
Two individuals have been found. 
ERCHOMUS. 
Erchomus, Motschoulsky, Bull. Mosc. 1858, i. p. 218; Horn. Trans. Amer. Ent. Soc. vi. p. 107. 
Tachinus fam. i. ex parte, Erichson, Gen. et Spec. Staph. p. 244, 
Coproporus, Kraatz, Ins. Deutsch. ii. p. 399; Sharp, Trans. Ent. Soc. Lond. 1876, p. 81. 
Cilea, pars, Fauvel, Ann. Mus. Gen. xu. p. 110. 
This genus at present consists probably of some sixty or seventy described species 
distributed in the tropical parts of the world, where apparently they correspond to the 
Tachini of the boreal regions. The genus exhibits considerable variety of structure, 
and is rather sharply divided into two sections by the condition of the epipleure. 
§ 1. The epipleura, or inflered margin of the wing-case, is but slightly developed in the 
vertical direction, the line limiting tt internally being always quite free from the 
inner face of the wing-case. 
1. Erchomus politulus. (Tab. VII. fig. 2.) 
Subdepressus, nitidissimus, niger; marginibus plus minusve picescentibus, antennarum basi pedibusque rufis, 
abdomine apicem versus flavescente; capite, thorace elytrisque levigatis, abdomine parce subtiliter 
punctulato; prothorace basi truncato, angulis posterioribus rotundatis. 
Long. 22 millim. 
Hab. Mexico, Cordova (Sallé); GuateMata, Cahabon in Vera Paz (Champion) ; 
Nicaracua, Chontales (Janson).—Sovutn AMERICA, Bahia (coll. Sharp). 
This species is no doubt closely allied to Tachinus*humilis, Er., which, however, is 
described as possessing punctuation on the elytra. In L. politulus the antennee are 
rather short and stout, thickened towards the apex, with the four basal joints pale, the 
others black ; joints 6-10 slightly transverse; the elytra are longitudinally impressed 
along the side, and the epipleure (seen beneath) have a somewhat prolonged edge, 
which, however, is small and obtuse in comparison with what exists in the more convex 
species. 
Only a single individual is before me from each of the Mexican and Guatemalan 
regions; but numerous specimens have been found at Chontales, and I have many from 
Bahia. ‘The one represented on the Plate is from Chontales. 
