386 STAPHYLINIDZA. 
subsinuato; elytris nigro-tomentosis hic inde parcissime albido-spergatis ; abdomine parum dense nigro- 
tomentoso, segmento singulo ad basin et latera albido-variegato; corpore subtus cinereo-pubescente. 
Long. 22 millim. 
Hab. Mexico (Flohr), Jalapa (Hoge), Cordova (Sallé). 
Antenne evidently thicker externally. Head narrower than the thorax, quadrate, 
with large eyes occupying fully two thirds of the length of the sides, with a remarkably 
distinct, deep, coarse punctuation, but not shining. Thorax about as long as broad, 
coarsely and very closely punctured, with a very small smooth space in front of the 
scutellum, this latter velvety black. Elytra very dull, black, slightly sprinkled in an 
irregular manner with minute white pubescence. Hind body black, on the middle and 
sides of each segment with a white pubescence, which is most developed on the apical 
segments, where it forms a fascia extending all across the base of the segment. The 
male has a slight emargination of the apical ventral plate, and in the female the front 
tarsi are much less broad than they are in the other sex. The figure is drawn from 
two examples found at Jalapa; it does not give an adequate idea of the variegation of 
the hind body, which, as in many other species of the genus, is too delicate and complex, 
as well as variable according to the light, to be faithfully rendered. 
36. Staphylinus optatus. 
Niger ; capite thoraceque cyaneis, subnitidis, fortius punctatis ; elytris subeyaneis; abdomine parum dense nigro- 
tomentoso, segmentis basalibus vix albido-variegatis, 5°-7™ basi fascia flammulata albida. 
Long. 22 millim. 
Hab. Muxico (coll. Sharp). 
This species is very closely allied to S. salvinianus, but has the anterior parts of a 
beautiful violet-blue tint ; the punctuation of the head and thorax is less dense, so that 
the interstices being broader give a somewhat more polished appearance. 
I have seen only a single example, of the female sex, obtained from Mr. G. R. 
Waterhouse’s collection. The surface of the wing-cases and hind body are apparently 
less variegate with white than they are in S. salvinianus, but this is possibly due to 
abrasion ; the front tarsi are not much dilated. 
37. Staphylinus guatemalenus. 
Niger, nigro-pubescens et tomentosus; capite thoraceque cyaneis, sat nitidis, crebre fortiter punctatis; elytris 
nigro-cyaneis, opacis, subtiliter vageque albido-nebulosis ; abdomine albido-variegato. 
Long. 24 millim. 
Hab. GUATEMALA, Sinanja (Champion). 
Antenne with the three basal joints elongate. Head quadrate, not narrowed in 
front, coarsely but not densely punctate, the interstices between the punctures being 
quite as large as the punctures: eye occupying just a little more than one half the 
length of the side; mandibles elongate and slender. Thorax a little narrowed in front, 
