312 HETEROMERA. 
regularly convex, the eyes very large; palpi testaceous, with the last joint of the maxillary pair darker, 
the latter differing greatly in shape in the two sexes—() nearly three times as broad as long, a little 
curved, and somewhat hammer-shaped, the apical and inner sides almost parallel, the tip obliquely 
truncate, the apical side deeply excavate within—( 9 ) elongate-triangular, with the angles rounded, the 
inner side not very much shorter than the outer side, the apical side only about half the length of the 
latter ; antenne varying in colour from testaceous to piceous with the two basal joints paler—(d) 
moderately stout, joints 3 and 4 short, 3 narrow, subtriangular, 4 wider than 3, fully as broad as long, 5 
very much broader than and more than twice as long as 4, 6 narrower and a little shorter than 5, 6—10 
gradually decreasing in width, about equal in length, all considerably longer than broad, 11 elongate-ovate, 
longer than 10—( 2 ) shorter, much stouter, and more tapering, joints 5-10 rapidly decreasing in width, 
5 very thick, 6 and 7 as broad as long, 8-10 rather longer than broad, 11 a little longer than 10; pro- 
thorax much broader than long; elytra elongate, convex, more parallel in the male than in the female; 
beneath (the prothorax excepted) usually in great part piceous, with the apex of each ventral segment 
reddish ; pygidium rather slender, very long in the male, shorter in the female, in the male nearly two 
and a half times, in the female twice, the length of the hypopygium; legs piceous or brownish, with the 
four anterior femora usually, and the tibial spurs, testaceous; the hind tibiz with two long oblique ridges 
and a shorter subapical one, and a long faint subdorsal ridge towards the base; the first joint of the hind 
tarsi with three, the second and third joints each with two, long oblique ridges; the middle tibize with a 
single long fine spur. 
Length to end of the elytra 4-54, to tip of the pygidium 5-64, millim.; breadth 13-13 millim. (¢ 9.) 
Hab. GuateMata, Capetillo, Teleman, Senahu (Champion) ; Panama, Bugaba, Volcan 
de Chiriqui (Champion). 
Numerous examples of both sexes. ‘This is one of a little group of closely-allied 
Central-American species. It has the fifth joint of the antenne very stout, and the 
fourth short in both sexes, these organs themselves being much thicker and more 
tapering in the temale than in the male. The last joint of the maxillary palpi in the 
male is formed as in UY. lineatocollis; but this joint in the female is more elongate, 
and not so broad as in that insect, with the angles more rounded. ‘The median patch on 
the disc of the thorax is distinct in all the specimens, but in two examples the lateral 
marks are obsolete. ‘The pubescence on the apical fourth of the elytra is usually 
golden-brown. The hind tibiz have in addition to the three well-marked oblique ridges 
a long fine ridge near the base (only visible when the tibia is detached or viewed in a 
particular way), this latter being less distinct than in J/. léneatocollis. 
4. Mordellistena valens. (Tab. XIII. fig. 27, 2 .) 
Elongate, broad, robust, cuneiform ; the head castaneous or reddish-yellow, darker in front, the eyes black, 
the prothorax luteous, the scutellum and elytra pitchy-brown, the elytra paler at the base and beyond 
the middle, the pygidium reddish; the elytra with nearly the apical half, an interrupted fascia before 
the middle (formed by oblique lines of pubescence), and some lines at the base golden-brown-pubescent,. 
the pubescence on the rest of the elytra blackish-brown, that on the prothorax and scutellum partaking 
of the ground-colour. Head regularly convex; palpi (Q) testaceous or pitchy-brown, the last joint of 
tie maxillary pair elongate, moderately stout, scalene-triangular, with the angles somewhat rounded ; 
antenne (@) similar in colour to the palpi, moderately stout, subfiliform, joints 3 and 4 small, rather 
longer than broad, 4 a little wider than 3, 5 about twice as long and twice as wide as 4, 5-10 decreasing 
in width, all considerably longer than broad, 11 slightly longer than 10; elytra elongate, narrowing 
almost from the base; pygidium (Q) very long and pointed, more than twice the length of the hypo- 
pygium ; beneath with the metasternum, the posterior cox, and the base of each ventral segment piceous, 
