MORDELLISTENA., 315 
times the length of the hypopygium; legs testaceous, the hind pair a little darker ; the hind tibise with 
two rather long, very oblique, ridges and a short subapical one: the first joint of the hind tarsi with three, 
the second and third joints each with two, short, oblique ridges. 
Length to end of the elytra 3-33, to tip of the pygidium 32-42, millim.; breadth 1-1} millim. 
Hab. Panama, Bugaba, Volcan de Chiriqui (Champion). 
‘Two examples, probably male and female, one of them having the antenne shorter 
and more slender, and the fourth joint a little shorter, than in the other. Less elongate 
than M. gracilicornis, the pygidium longer and more slender, the hind tibie with two 
long, very oblique, ridges and a short subapical one (instead of five short parallel ones). 
The shorter, broader, and more cuneiform shape, &c., distinguish it from the other 
similarly-coloured Mordellistene here described. 
9, Mordellistena callens. 
Rather short and robust, cuneiform, black or pitchy-brown, the mouth-parts testaceous; the pubescence 
sericeous-brown, uniform. Head large, very broad; maxillary palpi pitchy-brown or obscure testaceous, 
stout, the last joint broad-ovate with the apex very obliquely truncate; antenne pitchy-brown with 
the basal joints paler, rather short, joints 3 and 4 narrow, subequal, 5-11 moderately thickened, 5-10 
subequal, a little longer than broad, 5 much longer and stouter than 4, 11 longer than 10; prothorax 
transverse; elytra rather short, narrowing from the base; beneath black, the apical margins of the 
ventral segments obscure testaceous ; pygidium long and moderately stout, more than twice the length 
ot the hypopygium ; legs testaceous or brownish, the hind pair darker ; the hind tibize with three oblique 
ridges—the first and second long, extending partly across the outer face of the tibia, parallel, equal, the 
third (subapical) short ; the first joint of the hind tarsi with three, the second and third joints each with 
two, oblique, parallel ridges. 
Length to end of the elytra 3-33, to tip of the pygidium 33-43, millim.; breadth 1-1} millim. 
Hab. Mexico, Vera Cruz (Sallé), Atoyac in Vera Cruz (H. H. Smith); Guatema.a, 
Senahu (Champion) ; Nicaracua, Chontales (Janson). 
Five examples, apparently including both sexes. From J. valens and its allies this 
species may be known by its less elongate shape and much smaller size, and by the 
first and second carine of the hind tibie being extended partly across their outer face 
(instead of being placed one behind the other just below the dorsal edge). From 
M. instabilis, var. n, the position and number of the carine on the hind tibiz (two of 
these being elongated in WY. callens) sufficiently distinguish it; the third hind tarsal 
joint of the former is without carine. 
10. Mordellistena isthmica. (Tab. XIV. fig. 2.) 
Comparatively short, cuneiform, black, the mouth-parts testaceous, the elytra with an oblique rather broad 
flavo-testaceous stripe extending from the shoulders almost to the middle and a longitudinal obscure 
testaceous stripe extending from a little below this to the apex (these markings forming an interrupted 
dorsal stripe on each elytron), the pygidium black, obscurely reddish towards the apex ; the pubescence 
yellowish-cinereous on the elytral markings, for the rest blackish, that on the prothorax and head partly 
cinereous. Head broad, short; palpi testaceous, the last joint of the maxillary pair darker, the latter 
not very stout, elongate-ovate, with the apex abruptly truncate, the apical side very much shorter than 
the inner side ; antenne rather short, obscure testaceous, with the basal joints paler, joints 3 and 4 short, 
narrow, subequal, 5-11 moderately thickened, 5-10 gradually decreasing in length and width, subserrate, 
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