350 _ HETEROMERA. 
size, the very elongate elytra, and the long testaceous antenne distinguish it from 
M. festiva, apart from the differences in the sculpture of the hind tibie and tarsi. 
75. Mordellistena festiva. (Tab. XV. figg. 26,3; 26a, hind leg.) 
Elongate, very narrow, parallel, the head (the eyes excepted), prothorax, antennex, and palpi clear testaceous, 
the elytra black, each with a small obscure testaceous spot in the middle at the base, the pygidium reddish- 
testaceous ; the elytra with numerous transverse, partly confluent, yellowish-cinereous-pubescent spots 
scattered over the surface, these spots tending to form fascie, the scutellum with similarly coloured 
pubescence, that on the rest of the surface partaking of the ground-colour. Head moderately large ; 
palpi as in M. fasceculata; antenne moderately long, filiform, joints 3 and 4 short, subequal, 5~11 elon- 
gate, a little thickened, 5-10 subequal, 5 nearly twice as long as 4; prothorax transverse; elytra elongate, 
subparallel to beyond the middle; beneath black, the head, prothorax, front of the breast, and apex of 
each ventral segment testaceous ; pygidium very long, slender; anterior and middle legs entirely flavo- 
testaceous, the hind pair a little darker, the hind femora piceous; the hind tibize with a short subapical 
ridge and indications of a faint carina along the dorsal edge; the first joint of the hind tarsi with three, 
the second joint with two, very faint, oblique, parallel ridges. 
Length to end of the elytra 3, to tip of the pygidium 4, millim.; breadth 1 millim. (¢.) 
Hab. Mexico, Amula in Guerrero 6000 feet (H. H. Smith). 
One male example. Closely allied to I. fasciculata, from which, apart from colour, 
it differs by its relatively shorter elytra, rather stouter antenne, the fourth joint of 
which is only about half the length of the fifth, and the more fasciate arrangement of the 
pubescence. Viewed in certain lights, the hind tibiz seem to have a faint carina along 
the dorsal edge. | 
Fam. RHIPIDOPHORIDA. 
Three genera only of this group are known to me as yet from Central America; two 
of these, Emenadia and Rhipidophorus, are common to North and South America, but 
the third, Pelecotomoides, does not extend north of the Mexican State of Vera Cruz. 
It is probable that Toposcopus will eventually be found in Northern Mexico; it has the 
eyes completely divided and the claws serrate. A good deal of diversity of opinion 
exists amongst authors as to the application of the generic names in this family; the 
Munich Catalogue is here followed. 
PELECOTOMOIDES. 
Pelecotoides, Castelnau, Hist. Nat. Ins. Col. ii. p. 263 (1840). 
Trigonodera, Dejean, Cat. 3rd edit. p. 239 (1837); Gerstacker, Rhipiph. Col. Fam. Disp. Syst. p. 2 
(1855); Lacordaire, Gen. Col. v. p. 620. 
Pelecotomoides, Gemminger & Harold, Cat. vii. p. 2118. 
This genus is chiefly confined to Tropical America and Australia. Gersticker in his 
“ Monograph” enumerated thirteen species as belonging to it, but he appears to have 
overlooked those described by Shuckard and Blanchard. ‘Four are now recorded from 
