316 HETEROMERA. 
not much longer than broad, 5 nearly twice as long as, and very much wider than, 4; prothorax trans- 
verse ; elytra rather short, gradually narrowing from the base; beneath black, the middle of the breast 
and the apex of each ventral segment testaceous; pygidium comparatively short, rather stout, conical, 
twice the length of the hypopygium ; legs testaceous, the hind pair a little darker; the hind tibize with 
three oblique parallel ridges—the first extending more than halfway across the outer face of the tibia, 
the third short; the first joint of the hind tarsi with three or four, and the second and third joints each 
with two, oblique ridges. . 
Length to end of the elytra 24-3}, to tip of the pygidium 34-4, millim.; breadth g-13 millim. (@.) 
Hab. Panama, San Lorenzo, Tolé (Champion). 
Two examples. This species resembles the typical form of MW. mutabilis in its 
elytral markings, but it is shorter and broader, and has a more transverse head and 
thorax, and 2 much shorter and stouter pygidium; the ridges on the hind legs extend 
on to the third tarsal joint; the last joint of the maxillary palpi is stouter, more 
abruptly truncate at the apex. In the larger example there is an additional (finer) 
ridge in front of the others on the dorsal edge of the hind tibie. 
11. Mordellistena sexmaculata. (Tab. XIV. figg. 3,¢; 3a, antenna, 6; 
4, 2, var.; 4a, antenna, 2.) 
Moderately elongate, robust, cuneiform ; the head and prothorax flavo- or reddish-testaceous, the former (when 
viewed laterally or from behind) with a more or less brilliant opalescent lustre, the eyes black, the pro- 
thorax with indications of a very faint oblong median patch and a large spot on either side of it, the 
median patch in one example piceous (violaceous in certain lights); the scutellum and elytra piceous, or 
black with a violaceous lustre, the elytra each with a large oblique patch just below the shoulders extend- 
ing inwards, but not nearly reaching the suture, a broad transverse fascia or rounded spot at the middle, 
and a similar mark immediately before the apex (neither of which quite reach the suture) flavo-testaceous ; 
the pygidium flavous or reddish to about the middle, darker beyond; the pubescence on the dark parts of 
the elytra black, for the rest partaking of the ground-colour. Head convex ; palpi testaceous or flavous, 
the last joint of the maxillary pair moderately long, scalene-triangular, with the angles somewhat rounded, 
similar in both sexes; antenne piceous or pitchy-brown, with the four basal joints testaceous, very 
differently formed in the two sexes—( ¢ ) filiform, exceedingly elongate, fully as long as the elytra, joint 
3 slender, about as broad as long, 4-11 very elongate, gradually increasing in length and decreasing in 
width, the penultimate joints about two and a half times as long as broad, 11 longer than 10—(? ) one 
third shorter, joints 3 and 4 slender, 4 slightly wider and only a little longer than 3, 5-11 almost equal in 
length, 5 very much longer and wider than 4, the penultimate joints twice as long as bread ; prothorax 
transverse; elytra moderately long, gradually narrowing behind; beneath entirely flavo-testaceous, or 
testaceous with the sides of the metasternum, posterior coxe, and ventral segments, to a greater or less 
extent, piceous; pygidium slender and very elongate in both sexes, two and a half times the length of 
the hypopygium ; legs testaceous, the dorsal edge of the hind pair darker; the hind tibie with five 
(including the subapical one), the first joint of the hind tarsi with four, and the second and third joints 
each with two (those on the third very faint), short, oblique, parallel ridges. 
Length to end of the elytra 3j-4, to tip of the pygidium 43-5, millim.; breadth 1-14 millim. (do 2.) 
Hab. Mexico, Atoyac in Vera Cruz (//. H. Smith); Guatmmata, Chacoj and Panima 
in Vera Paz (Champion). 
Three examples from Mexico (two females and one male), and two (both females) 
from Guatemala, all from the lower part of the Atlantic slope. The antenne are very 
elongate in the male, and their fourth and fifth joints are differently shaped in the two - 
