376 STAPHYLINIDA. 
similar to certain of the darker varieties of S. caliginosus, it is distinct by the more 
quadrate head and thorax, and by the antenne, which are not marked with yellow at 
the base; in these respects it resembles S. incognitus, from which it is distinguished 
by the larger punctures on the thorax, and the intensely black colour of the surface 
and of the pubescence. 
11. Staphylinus incognitus. 
Niger, opacus, griseo-pubescens; abdomine in medio bifariam nigro-velutino bimaculato, apice testaceo. 
Long. 20 millim. 
Hab. Mzxtico, Coatepec (Flohr). 
The antenne are entirely black, short, evidently thickened towards the extremity. 
Head quadrate, not narrowed in front, excessively densely punctured. Thorax quadrate, 
excessively densely punctured, very dull, without smooth line along the middle. Elytra 
as long as the thorax, excessively densely and indistinctly punctured. Hind body 
black, with minute grisescent atoms mixed with the black tomentum, on the middle 
of each segment with two rather distinct black spots; the terminal segment, the anal 
styles, and the hind margin of the penultimate segment yellow. 
This is described from a single, very abraded individual, but indicates a species 
certainly distinct ; the head and thorax are more quadrate than in S. caliginosus, and 
the eyes occupy a slightly greater extent of the sides, just less than one half; the punc- 
tuation of the head, thorax, and elytra is more dense; and if I may judge from a small 
amount of pubescence existing on the extremity of the wing-cases, the anterior parts of 
the body bear a more pallid griseous pubescence. 
12. Staphylinus angusticeps. (Tab. IX. fig. 18.) 
Omnium nigerrimus, opacus, nigro-tomentosus ; abdomine in medio parum conspicue bifariam nigro-bimaculato ; 
minus parallelus, capite thoraceque angustioribus magis elongatis. 
Long. 24 millim. 
Hab. Mexico (Flohr), Puebla and Toluca (Sallé), Jalapa (Hége). 
* 
Readily distinguished from other species by the peculiar form, the head being con- 
siderably narrower than the thorax, and the thorax also narrower than the elytra; the 
mandibles too are rather longer, the front tarsi narrower, and the raised margin along 
the sides of the thorax less fine than in the allied species. There is a very fine carinula 
along the middle of the thorax, and the punctuation of these parts is excessively dense, 
rather coarse. ‘The middle coxe are only slightly separated. The male characters are 
but slight, being limited to a broad shallow emargination of the apical ventral plate. 
Apparently not a common species, as I have seen only a single example from each of 
the localities above cited: the one figured is a female sent by Mr. Flohr; but the 
figure does not give a good idea of the insect, the head being drawn too square. 
