336 STAPHYLINIDA. 
margin is emarginate; the two preceding segments are flattened along the middle, and 
on this part densely and finely punctate, and furnished with a close yellow pubescence. 
Mr. Champion has found a series of ten individuals of this species; it inhabits the 
banks of streams. The unique Mexican individual is apparently immature, and though 
it differs minutely in some points can hardly be a distinct species. I have two very 
closely allied Brazilian new species. 
QUEDIONUCHUS. 
Caput quadrato-orbiculare, collo abrupto. Palporum articulus ultimus gracilis; gene immarginate. Pro- 
thoracis margines anguste, parum inflexe. Femora posteriora longius fortiterque spinulosa. Tarsi 
posteriores graciles. 
This genus will comprise, in addition to the Central-American species here enu- 
merated, some undescribed Japanese forms, and the well known European Staphylinus 
levigatus, Gyll., referred by modern authors to Quediws. Although approached in one 
or more of its peculiarities by different sections of Quedius, the genus is a truly distinct 
and natural one, on account of the above combination of characters, and is of interest 
by the fact that itis the nearest approach made by the Quediina to the genus Philonthus. 
Indeed, in the form of the head, neck, and eyes, and the obliterated margin of the 
gene, and the less developed and less infolded side margins of the prothorax, it 
approaches very closely to some of the Staphylinine. Its nearest allies in the genus 
Quedius are Q. impressus and Q. capucinus. All the species of Quedionuchus are sub- 
cortical in their habits ; and all of them have the usual diffuse punctuation of the wing- 
cases absent, the surface being smooth (except at the lateral margins) and bearing only 
a few serial setigerous punctures. 
1. Quedionuchus impunctus. 
Subdepressus, niger ; pedibus palpisque piceis, his articulo ultimo illis tarsis rufis; elytris longioribus quam 
prothorax, subopacis, levigatis ; abdomine parce punctato. 
Long. 9-14 millim. 
Quedius cordillere, Chev. in. litt.’ 
Quedius impunctus, Solsky, Hor. Soc. Ent. Ross. v. p. 124. 
Hab. Mexico ', Popocatepetl 12,000 feet (Zruqui), Jacale, Orizaba (Sadlé), Ciudad 
Mexico (Flohr & Forrer), Las Vigas, Jalapa, Oaxaca (Hége), Guatemala, Volcan de 
Agua, 8500 to 10,500 feet (Champion). 
Var. Elytris rufis. 
Hab. Mxxico, Oaxaca, Jalapa (Hége), Durasnal, Orizaba, Parada (Boucard, coll. Sallé). 
Antenne rather short and stout, nearly black; third joint longer than the second, 
fifth about as long as broad, sixth to tenth each a little transverse. yes but little pro- 
minent, and not extending backwards quite half the length of the sides. Thorax about 
as long as broad, a little narrowed in front and slightly sinuate at the sides; the front 
