560 STAPHYLINID ZA. 
species from WV. nigricans. N. densus has the front tarsi rather more dilated and a 
smaller head. 
Two female examples; in one, which is immature, the elytra are piceous. The 
individual from Mexico is in bad preservation, but appears to be a variety of the 
same species. 
MESPALERUS. 
Corpus depressum. Mandibula sinistra bidentata, dextra tridentata. Labrum breve, fere recte truncatum. 
Tarsi anteriores haud dilatati; posteriores breves, articulis secundo, tertio quartoque subsequalibus, articulo 
basali parum elongato, sed quam secundus bene longiore. 
This genus, though closely allied to Neomedon, seems quite distinct by the above 
characters. ‘The only species I know are those described below. 
1. Mespalerus przustus. 
Angustulus, depressus, nigricans, nitidus, antennis rufis, pedibus fuscis, tibiis dilutioribus, tarsis testaceis ; 
elytris dimidio basali rufo-lurido, subtiliter punctatis, capite prothoraceque fortiter punctatis. 
Long. 44 millim. 
Hab. Guatemata, Aceytuno, San Gerdénimo, San Joaquin, Balheu (Champion). 
Antenne short and rather stout, the third joint slightly longer than the second. 
Head large, quadrate, coarsely, very closely and regularly punctate, shining; eyes small. 
Thorax small, transverse, narrowed behind, coarsely and closely punctate, with a very 
fine smooth line down the middle, the punctuation not so coarse and close as that of 
the head. Elytra long and narrow, finely punctate, shining ; the basal portion largely 
red, the apical portion black, the division between the two colours rather indefinite. 
There is scarcely any external difference between the male and the female. 
2. Mespalerus flavipennis. (Tab. XIV. fig. 16.) 
Angustulus, depressus, nitidus, fuscus, capite nigro, antennis, elytris pedibusque testaceis ; capite quadrato, 
crebre fortiterque punctato. 
Long. 4 millim. 
Hab. Guaremata, Zapote, San Gerénimo, El Jicaro (Champion). 
This insect is very closely allied to WZ. preustus, and is of similar flat, parallel form; 
it is, however, rather smaller in size, and the punctuation is not quite so coarse; and, 
though the two examples are rather immature, I have little doubt the coloration will 
be found constantly more pallid. 
One example from each locality; the specimen figured was taken at San Gerénimo. 
3. Mespalerus debilis. 
Angustior, sat depressus, nitidus, nigricans, antennis fusco-rufis, pedibus testaceis, elytris basin versus vage 
rufescentibus ; capite quadrato, dense fortiterque punctato; prothorace minus transyerso, fortiter sub- 
obsolete punctato, medio linea levigata; elytris subtiliter minus dense punctatis. 
Long. vix 33 millim. 
