318 HETEROMERA. 
joint 3 long and slender, 4-11 comparatively stout, 4 and 5 equal, each about twice as long and more 
than twice as wide as 3, 5-10 gradually increasing in length but decreasing in width, the penultimate 
joints two and a half times as long as broad; prothorax transverse; elytra elongate, gradually 
narrowing from the base; beneath black, the sides of the breast and the base of each ventral segment 
with some yellowish-cinereous pubescence ; pygidium ( ¢ ) moderately long, rather stout, twice the length 
of the hypopygium ; legs piceous, the anterior femora and tibie, the knees of the intermediate pair, and 
the hind tibial spurs testaceous; the hind tibie with six (including the subapical one, the basal one 
abbreviated), the first joint of the hind tarsi with four, and the second joint with two, short, oblique, 
parallel ridges. 
Length to end of the elytra 33, to tip of the pygidium 44, millim.; breadth 13 millim. (<¢.) 
Hab. Mexico, Chilpancingo in Guerrero (H. H. Smith). 
One male example. Lasily recognizable amongst its allies by the very long and 
comparatively stout antenne in the male sex, the fourth and fifth joints equal in size ; 
the last joint of the maxillary palpi is elongate and rather narrow, and has its outer 
side concave. The first ridge on the hind tibie is very short; the corresponding 
ridge on the first hind tarsal joint is distinct on one leg and obliterated on the other. 
14. Mordellistena rufonotata. (Tab. XIV. fig. 7, ¢.) 
Elongate, cuneiform, rather narrow, above and beneath black, the elytra with a large reddish spot at the 
shoulders ; the suture very narrowly, and a narrow line along each elytron at the sides, to about one 
third from the apex, yellowish-cinereous-pubescent, the prothorax with the basal margin narrowly, and 
an interrupted line along either side of the disc, similarly pubescent, the rest of the pubescence partaking 
of the ground-colour. Head large, broad ; palpi testaceous, the last joint of the maxillary pair piceous at 
the tip, the latter (¢) moderately long, stout, scalene-triangular; antennz (d) black with the basal 
three joints a little lighter, very elongate, stout, joint 3 short, narrow, 4-11 much thickened, 4-10 sub- 
‘equal, very much longer than broad, 11 longer than 10 ; prothorax strongly transverse ; elytra moderately 
long, narrowing from the base ; pygidium elongate (the apical half broken off); legs comparatively stout, 
black, the tibial spurs testaceous ; the hind tibie with five, the first joint of the hind tarsi with four, the 
second joint with two, short, faint, parallel, oblique ridges. 
Length to end of the elytra 4, breadth 14, millim. (<¢.) 
Hab. Muxtco, Jalapa (Hége). 
One male example. This species has the antenne (¢ ) stout and very elongate, and 
formed asin WM. forticornis and MM. opalescenticeps, the fourth joint being equal in 
length and breadth to the fifth ; it has the last joint of the maxillary palpi shaped as 
in the latter. MM. rufonotata is not closely allied to any other Mordellistena here 
described. ‘The hind tibiz and the first two joints of the hind tarsi have numerous 
very short faint parallel ridges ; and in addition to those mentioned above there are 
traces of others on the basal portion of the tibia and of the first tarsal joint. 
15. Mordellistena gracilicornis. (Tab. XIV. figg. 8, ¢; 84, maxillary 
palpus, ¢; 846, hind leg.) 
Elongate, subcuneiform, castaneous or rufo-luteous, the elytra usually with a large triangular common basal 
patch, two very oblique fascize of variable extent on the disc, and an anteapical spot piceous, these 
markings in some examples completely obliterated ; the pubescence yellowish-cinereous, blackish-brown 
on the elytral markings. Palpi testaceous, the last joint of the maxillary pair moderately long, scalene- 
