329 HETEROMERA. 
elongate, more than twice the length of the hypopygium ; legs testaceous, the hind pair a little darker ; 
the hind tibiew with five (including the subapical one), the first joint of the hind tarsi with four (the 
basal one very short), and the second joint with two, short, oblique, parallel ridges. 
Length to end of the elytra 3, to tip of the pygidium 32, millim.; breadth 1 millim. (¢.) 
Hab. Panama, Bugaba (Champion). 
One male example. Deceptively like I. sermaculata (2), but with the antenne 
much shorter and more slender, the palpi differently shaped, the pygidium shorter, &c. 
The head is without opalescent lustre; the ground-colour of the elytra is piceous, and 
the flavo-testaceous markings extend to the lateral margin and also (the oblique basal 
one excepted) to the suture; the last joint of the maxillary palpi is wider than in 
MM. sexemaculata and has its outer side hollowed out; the third joint of the hind tarsi is 
without ridges. From the paler varieties of IZ. instadilis the more angulated elytral 
fascize will easily distinguish it. 
21. Mordellistena venusta. (Tab. XIV. figg. 13; 13a, hind leg.) 
Moderately elongate, robust, cuneiform; the head and prothorax flavo-ferruginous, the head with a brilliant 
opalescent lustre, the eyes and the tips of the mandibles black, the elytra black, with a reddish-yellow 
oblique stripe on the disc extending from the base some little distance downwards, the pygidium reddish- 
yellow to the middle, black beyond; the elytra with an oblique stripe of yellowish-cinereous pubescence 
extending from the base to fully four-fifths of their length—this pubescence placed upon and forming a 
continuation of the stripe on the surface beneath—and the suture towards the base also with a little 
yellowish pubescence, for the rest densely black-pubescent ; the pubescence on the head and prothorax 
partaking of the ground-colour and rather sparse. Head moderately convex; palpi testaceous, the last 
joint of the maxillary pair piceous, the latter triangular, rather narrow, its inner side not much shorter 
than the outer side, the latter nearly twice as long as the apical side; antenne moderately long, com- 
paratively stout, black, the three basal joints obscure testaceous, joint 3 short, narrow, 4 a little wider and 
longer than 3, 5-11 moderately widened, subserrate, 5-10 equal in length and breadth, longer than wide, 
5 very much broader and longer than 4, 11 slightly longer than 10; prothorax transverse; elytra 
moderately long, narrowing from the base; beneath entirely reddish-testaceous; pygidium moderately 
elongate, twice the length of the hypopygium ; legs pitchy-brown, all the femora and the base of the hind 
tibie testaceous ; the hind tibize with five (including the subapical one, the basal one abbreviated), the 
first joint of the hind tarsi with three, and the second joint with two, rather long, oblique, parallel 
ridges, 
Length to end of the elytra 34, to tip of the pygidium 4, millim.; breadth 13 millim. 
Hab. Panama, Volcan de Chiriqui (Champion). 
‘One specimen, its sex not ascertained. A species without near ally, as regards 
colour and the arrangement of the elytral pubescence. The oblique ridges on the 
hind tibie are longer than in I. sexamaculata, &c.: they extend fully halfway across 
the outer face of the tibia. The North-American WM. attenuata, Say (vittigera, Lec.), 
has the elytra somewhat similarly marked. 
22. Mordellistena pictipennis. (Tab. XIV. fig. 14,2.) 
Moderately elongate, cuneiform, black; the head, the prothorax with an elongate-triangular mark on either 
side of the middle behind—extending forwards nearly to the apex and connected along the basal margin, 
—the scutellum, the elytra with two short parallel oblique streaks on the disc below the base, some 
