MORDELLISTENA. 339 
testaceous ; the hind tibie and the first joint of the hind tarsi each with three or four, the second joint 
with two, short, oblique ridges. 
Var. The prothorax with an oblong stripe on the middle of the disc behind (and the apex in the centre in one 
example), and the basal half of the head, more or less infuscate or piceous. 
Length to end of the elytra 23-34, to tip of the pygidium 3-47, millim.; breadth 2-1 millim. 
Hab. Mexico, Chilpancingo and Amula in Guerrero, Cuernavaca, Teapa (H. H. 
Smith). 
Numerous examples of the type, two only of the variety. This is one of numerous 
very closely allied Mexican species, and it may be only a colour-variety of MZ. murina. 
Its chief characters are:—the long and slender antenne, with joints 3 and 4 short 
and equal, the long maxillary palpi, the apical joint of which is cultriform in shape, 
the long pygidium, &c. The ridges on the hind tibie are short, this character 
readily separating M. azteca from WM. occidentalis. Sexual differences I am unable to 
detect. 
45. Mordellistena rufopyga. | 
Moderately elongate, parallel, black, the head (the eyes excepted) and prothorax reddish-testaceous, the antenne 
and palpi testaceous, the pygidium reddish, the pubescence partaking of the ground-colour. Head broad, 
short, the eyes large; maxillary palpi rather stout, the last joint triangular, oblong, its inner and apical 
sides about equal in length; antennz comparatively stout, filiform, moderately long, joints 3 and 4 very 
short, subequal, 5 two anda half times as long as 4, 5-10 about equal in length and width, 11 longer than 
10; prothorax a little broader than long; elytra moderately long, parallel in their basal half; beneath 
with the head, prothorax, the middle of the breast, and the last two ventral segments reddish-testaceous, 
for the rest black ; pygidium elongate, about two and a half times the length of the hypopygium ; anterior 
and middle legs testaceous, the hind pair (the tibial spurs excepted) in great part piceous; the hind tibize 
and the first joint of the hind tarsi each with three, the second joint of the hind tarsi with two, short, 
oblique, parallel ridges. 
Length to end of the elytra 23, to tip of the pygidium 3, millim. (¢.) 
Hab. Guatemata, Capetillo (Champion). 
One male example. Smaller and less elongate than IZ. rubdricollis; the antenne( ¢ ) 
a little longer, and with their joints 5-11 equal in width, 5 longer than 3 and 4 united ; 
the maxillary palpi less elongate, and with a much shorter apical joint; the head more 
transverse ; the pygidium and last two ventral segments reddish, the former more elon- 
gate; the elytral pubescence black. The stouter and less elongate antenne, short 
tibial carine, &c., distinguish it from UZ. filicornis. 
46. Mordellistena sparsa. (Tab. XV. figg. 4,3; 4a, maxillary palpus.) 
Moderately elongate, narrow, subparallel, above and beneath, the antenne, palpi, and legs (except the hind 
tibial spurs, which are testaceous) black, densely and rather coarsely pubescent ; the elytra from the base 
to the apex with small, somewhat closely placed, transverse, partly confluent, irregular patches of cinereous 
or yellowish-cinereous hair, for the rest black-pubescent, the pubescence on the head and prothorax in 
part cinereous. Maxillary palpi stout, the last joint moderately long, triangular ; antennee comparatively 
short, joints 3 and 4 short, narrow, subequal, 5-11 moderately thickened, 5 much longer and stouter than 
4, 5-10 equal in width and length, about as broad as long, 11 very much longer than 10; prothorax 
