284 HETEROMERA. 
Hab. Panama, Bugaba (Champion). 
One example, which, from the form of the apical joint of the antennae, is probably 
of the female sex. Perhaps a small varietal form of M. chevrolati, but differing from 
our four examples of that species in the markings of the thorax and elytra: the tri- 
angular silvery patch on either side of the middle of the thorax at the base is continued 
forwards to beyond the middle, so as to partly divide the blackish pubescence into three 
vittee, this pubescence being very much darker than it isin UM. chevrolati; the elytra 
have an additional silvery spot under the shoulder, the two other spots are less elongate 
and more obliquely placed, and the blackish pubescence on the basal half extends to 
the lateral margin. 
25. Mordella dimidiata, (Tab. XII. fig. 12.) 
Moderately elongate, black, the prothorax usually entirely rufous—sometimes with the base very narrowly or 
the basal half, sometimes entirely, piceous; the head cinereo-pubescent ; the prothorax bordered with 
cinereous pubescence at the base, the pubescence of the rest of the surface partaking of the ground-colour 
or brown in dark-coloured specimens; the scutellum brownish- or cinereo-pubescent; the elytra with a 
little more than the apical half uniformly brown-pubescent, a line of cinereous or brownish-cinereous 
pubescence extending upwards along the suture to the base and continued along it to meet a longitudinal 
line of pubescence running from the base downwards on the outer portion of the disc, this latter not 
reaching the brown pubescence but abruptly ending and with an oblique branch running upwards from 
its point of termination to a little below the shoulder, the rest of the pubescence on the basal portion 
black ; the pygidium cinereo- or fusco-pubescent. Last joint of the maxillary palpi piceous, not very 
broad, subtriangular, its outer side much longer than the inner or apical sides; antenne black with the 
basal joints obscure testaceous, short, joints 3 and 4 narrow, subequal, 5-11 wider and moderately dilated, 
5-10 serrate, decreasing in length, 8-10 transverse ; elytra moderately long, shorter in some specimens ; 
beneath in great part cinereo-pubescent, the ventral segments (except in the middle) black along their 
posterior half; pygidium rather slender, moderately long, shorter in the female, blunt at the tip, in the 
male more than twice the length of the hypopygium ; legs black, the tibial spurs piceous, the anterior 
coxee and femora usually paler in colour, the posterior tibial spurs comparatively short. 
Length to end of the elytra 23-4, to tip of the pygidium 3-5}, millim.; breadth 13-12 millim. (¢ 9.) 
Hab. Mexico, Jalapa, Cerro de Plumas (Hége), Teapa in Tabasco (H. H. Smith); 
Guatemala, Cahabon (Champion); Nicaraeua, Chontales (Janson); Panama, Volcan de 
Chiriqui, Caldera, San Lorenzo (Champion). 
Widely distributed but apparently scarce, one or two examples only having been 
found at each locality. This species differs from all the other Central-American 
Mordelle in the arrangement and colour of the pubescent markings on the elytra. 
The thorax is usually rufous, rarely piceous, this difference in colour not being sexual. 
The antenne are short, serrate from the fifth joint, and rather slender. The last joint 
of the maxillary palpi is subtriangular and only moderately stout. The lines of light 
pubescence on the basal half of the elytra are of a more ashy colour than the pubescence 
on the posterior half, the latter being brown; the pubescence on the rest of the anterior 
portion is black. The insect varies greatly in size. 
