340 HETEROMERA. 
54, Mordellistena luteola. | 
Elongate, narrow, subparallel, above and the oral organs and antenne flavo-testaceous or luteous, the eyes 
black, the sides of the elytra in one specimen a little darker about the middle, the pubescence uniform. 
Head comparatively long; the eyes exceedingly large, occupying the whole of the side of the head, coarsely 
_ granulated; last joint of the maxillary palpi moderately stout, elongate, scalene-triangular, the apical side 
slightly rounded ; antenne moderately long, rather shorter in the female, filiform, joints 3 and 4 short, 
subequal, together a little shorter than 5, 5— W elongate, 5-10 gradually decreasing in length and width, 
each at least twice as long as broad, 5 in both sexes the longest and stoutest; prothorax as long as broad ; 
elytra elongate, subparallel in their basal half; beneath testaceous, the beaadt in front and the ventral 
segments 1-3 at the base sometimes piceous ; pygidium very elongate and slender in both sexes, about 
three times the length of the hypopygium; legs flavo-testaceous, the hind pair a little darker ; anterior 
tibie considerably stouter in the male than in the female, sinuous within; anterior tarsi (¢ ) with the 
first joint about as long as the others united, very slightly curved inwards, the following joints slender ; 
the hind tibie with three oblique parallel ridges—the first extending across the outer face of the tibia to 
near the base, the second shorter, the third very short; the first joint of the hind tarsi with three, the 
second joint with two, oblique ridges. 
Length to end of the elytra 3-33, to tip of the pygidium 33-43, millim.; breadth ?-1 millim. (¢ 2.) 
Hab. Mexico, Cerro de Plumas (Hoge), Teapa (H. H. Smith); Guatemana, Cuabil- 
guitz (Champion); Panama, Bugaba (Champion). 
One male and three female examples, the male being from Bugaba. Very near 
M. distorta, but easily separable in the male sex by the form of the anterior tibie 
and tarsi: the tibiee, instead of being broadly flattened, are merely a little thickened 
and sinuous, and the tarsi have their first joint very feebly curved. ‘The eyes are equally 
large in the two species. 
55. Mordellistena isabellina. (Tab. XV. figg. 12; 12a, hind leg.) 
Very elongate, narrow, cuneiform, above, the oral organs, antennez, and legs brownish-yellow, beneath reddish- 
testaceous, the eyes black, the hind tibia and tarsi slightly infuscate along their dorsal edge, the pubescence 
uniform. Head rather elongate, the eyes large; last joint of the maxillary palpi elongate, rather narrow, 
its inner and apical sides about equal in length, the inner apical angle rounded ; antenne very slender, 
filiform, comparatively short, joints 3 and 4 short, narrow, subequal, together about as long as 5, 5-11 
fully twice as long as broad, subequal; prothorax not much broader than long; elytra very elongate, 
narrowing from the base; pygidium moderately long, twice the length of the hypopygium, rather stout ; 
legs very elongate; the hind tibize with three parallel oblique ridges—the first extending across the outer 
face of the tibia to near the base, the others short; the first joint of the hind tarsi with three, the second 
joint with two, oblique ridges. 
Length to end of the elytra 33, to tip of the pygidium 43, millim.; breadth 1 millim. 
Hab. Guatemata, Capetillo (Champion). 
One example, probably of the female sex. Closely resembling M. luteola, but more 
cuneiform ; the elytra relatively much longer, distinctly narrowing from the base, the 
antenne with joints 5-11 more slender, the last joint of the maxillary palpi less angular, 
the pygidium stouter, and the eyes a little smaller. On the hind tibie and on the first 
joint of the hind tarsi there are traces of a short additional ridge in front of the 
others. 
