s05 HETEROMERA. 
41. Mordellistena diluta. (lab. XV. figg. 7; Ta, maxillary palpus; 7 4, hind 
leg.) 
Elongate, narrow, subparallel, shining; the head (the eyes excepted), prothorax, and scutellum flavo-testaceous ; 
the elytra piceous, each with the middle of the disc anteriorly testaceous or brownish (the sides and apical 
half, and the suture also in one example, more or less piceous); the pygidium obscure testaceous ; the 
pubescence sparse and partaking of the ground-colour. Head moderately large, the eyes small ; maxillary 
palpi obscure testaceous, the last-joint quite slender, elongate-ovate ; antenne moderately long, rather 
stout, pitchy-brown, the three basal joints testaceous, joint 3 narrow, short, 4-11 thickened, 4 much 
longer and stouter than 3, 4-10 subequal, considerably longer than broad, 11 slightly longer than 10; pro- 
thorax about as long as broad; elytra elongate, subparallel in their basal half; beneath flavo-testaceous, 
the last two ventral segments slightly infuscate; pygidium very slender and elongate, at least three times 
the length of the hypopygium ; legs flavo-testaceous, the carine on the hind legs piceous; the hind tibize 
with three ridges—the first and second oblique, parallel, extending halfway across the outer face of the 
tibia, the third (subapical) short; the first joint of the hind tarsi with two oblique ridges, the second 
joint with one only. 
Length to end of the elytra 3-34, to tip of the pygidium 3-4, millim. 
Hab. Guatemata, Calderas on the slope of the Volcan de Fuego 7000 feet (Cham- 
pron). 
Two examples, apparently male. and female, one of them having a longer pygidium 
than the other. This species differs from all others of the genus here described by 
the very narrow, elongate-ovate apical joint of the maxillary palpi. The antenne are 
comparatively stout, their fourth and fifth joints subequal, the fourth much longer and 
stouter than the third ; the pubescence is quite sparse ; the pygidium is very elongate 
and slender. 
52. Mordellistena orizabensis. (Tab. XV. figg. 8,3; 8a, hind leg.) 
Mordellistena orizabensis, Mikl. Act. Soc. Fenn. x. p. 589°. 
Very elongate, subparallel, black, the head and prothorax reddish-testaceous, the latter with a large oblong 
black patch on the middle of the disc behind, the pubescence dense and partaking of the ground-colour. 
Palpi testaceous, the last joint of the maxillary pair darker, the latter moderately stout, elongate, scalene- 
triangular, its inner and outer sides somewhat concave; antennee piceous with the basal four joints testa- 
ceous, long and slender, filiform, joints 3 and 4 short, equal, together as long as 5, 5-11 very little thick- 
ened, subequal, more than twice as long as broad; prothorax transverse; elytra elongate, subparallel in 
their basal half; beneath, the head and prothorax excepted, black ; pys gidium exceedingly long, slender, 
three times the length of the hypopygium; anterior and middle legs in great part testaceous, the hind 
pair piceous with the tibial spurs testaceous ; the hind tibiee with four oblique ridges—the first abbrevi- 
ated, the second very long, extending across the outer face of the tibia to near the base, and sometimes 
interrupted in the raids, the others short; the first joint of the hind tarsi with four or five, and the 
second joint with two or three, parallel ridges. 
Length to end of the elytra 33-4, to tip of the pygidium 54-53, millim. 
Hab. Mexico (Boucard '), Cordova (Sallé). 
The ridges on the hind tibie are rather irregular and sometimes interrupted. ‘The 
pygidium is exceedingly elongate. Three specimens of this species are contained in the 
Sallé collection, two of which are males. 
