416 HETEROMERA. 
basal half, with very fine lightly impressed striw, the strie with exceedingly fine, jeri leo ante 
punctures, the interstices quite flat and each with about two rows of very minute pune enn ; benea 
finely and sparsely punctured, the fifth ventral segment much more closely so, the metas ernum very 
closely and finely punctured in the middle behind in the male; legs and antenne ferruginous. a, 
g. Anterior tibie triangularly widened on the inner side about the middle. The lateral lobes o e _ 
ventral segment much curved and gradually narrowing towards the apex, the apices converging towards 
each other; the central sheath much as in A. depressa. (Fig. 2-) 
Length 84 millim.; breadth 3 millim. (d.) 
Hab. Mexico, Etla (Sallé). 
A single male example. This species is closely allied to the preceding ; it differs as 
follows :—The thorax is more rounded at the sides, almost as much narrowed behind 
as in front, and more closely punctured ; and the elytra are comparatively much shorter, 
opaque, very lightly and minutely punctured, and with the interstices quite flat. 
10. Allecula angustata. (Tab. XIX. fig. 3.) 
Elongate, narrow, reddish-brown or brownish-piceous, scarcely shining, thickly clothed with short pubescence. 
- Head closely but not very finely punctured; eyes rather large and convex ; prothorax transverse, small, 
feebly transversely convex, widest at the middle, the sides a little rounded but almost straight or very 
slightly narrowing behind, the hind angles obtuse, the disc shallowly canaliculate, more distinctly so 
behind, and transversely flattened before the base, the basal fovez small and very shallow, the surface very 
finely and closely punctured ; scutellum somewhat closely punctured ; elytra long and narrow, sub- 
parallel to beyond the middle, much wider than the prothorax, very finely and lightly punctate-striate, the 
interstices very feebly convex and rather closely punctured, the punctures not much finer than those of the 
strie ; beneath more shining, finely and sparsely punctured, the metasternal side-pieces closely and 
coarsely so; legs and antenne fusco-ferruginous, the femora darker. 
g. Anterior tibie curved a little outwards towards the apex, unarmed on the inner side. The lateral lobes of 
the last ventral segment slender and curved inwards, the apices widely apart; the central sheath with its 
apical portion subtriangular in shape, the sides of this part armed towards the base with a few very 
short sete directed backwards. (Fig. 3.) 
Length 83-93 millim.; breadth 23-3 millim. (<¢.) 
Hab. Mexico, Tula in Hidalgo, Yautepec in Morelos (Hége). 
Three examples. Much narrower than A. depressa; the thorax more finely and 
closely punctured, the punctures of the elytra] striz much finer, the metasternal side- 
pieces more closely punctured, &c. 
This insect approaches Alethia hégei in its general facies; it differs, however, in the 
broader apical joint of the labial palpi, as well as by other characters. | 
11. Allecula laticeps. (Tab. XIX. fig. 4, 2.) 
Moderately elongate, rather broad, dull brownish-piceous or black, very sparsely clothed with pubescence. 
Head broad, closely and shallowly punctured, the vertex smoother; eyes (Q) rather small, very widely 
separated; prothorax transverse, broad, transversely convex, the sides a little rounded and narrowing 
almost as much behind as before, the hind angles obtuse, the disc obsoletely canaliculate and somewhat 
convexly raised on each side behind the middle, the basal fovee shallow and ill-defined, the surface 
uneven and finely, irregularly, and rather sparsely punctured ; scutellum finely and sparsely punctured ; 
elytra rather broad, moderately long, much wider than the prothorax, widest behind the middle, the 
sides straight in front and obliquely cut off behind, the apices broadly rounded, with rows of moderately 
fine approximate punctures placed upon very shallow striw, the interstices almost flat and each with 
