116 HETEROMERA. 
straight behind and converging in front, the hind angles subrectangular, the surface unimpressed ; elytra 
very elongate, the punctures separate one from another, and not confluent as on the head and prothorax ; 
beneath piceo-testaceous or piceous-brown, closely and coarsely punctured and pubescent ; legs very long, 
more or less testaceous, with the femora and the apices of the tibie stained with piceous, the first joint of 
the hind tarsi rather longer than the following joints united. 
Length 33-43 millim. (¢ 9.) 
Hab. Mexico, Real del Monte in Hidalgo (Hége). 
Five specimens. Larger and very much more elongate than Jf. sericans and 
M. gracilis. The general outline more fusiform, the thorax longer, the frontal suture 
obliterated. Our two male examples exhibit the above-described dark coloration, 
the three females being of a much lighter tint; the males are considerably narrower 
than the females. 
6. Microtonus fusiformis. (Tab. V. fig. 18.) 
Very elongate, fusiform, convex, slightly shining; the head and prothorax reddish-testaceous, the latter much 
suffused with piceous; the elytra testaceous, with a large triangular scutellar patch, the suture narrowly, 
but with a common oblong patch beyond the middle and another at the apex, and an oblong lateral patch 
about the middle (extending narrowly upwards and downwards along the margin), piceous ; the entire 
upper surface densely and coarsely (the head and prothorax rugosely) punctured, and clothed with long 
appressed pubescence. Head without distinct transverse frontal suture; eyes moderately large, not very 
convex, black; antenne and palpi testaceous; prothorax convex, not so long as broad, the sides rapidly 
~ and obliquely converging from the base, the hind angles very acute and extending outwards as far as the 
base of the elytra, the surface unimpressed ; elytra very elongate, more shining than the prothorax, the 
punctures moderately close ; beneath piceous, the venter and metasternum in great part reddish-testaceous, 
closely and coarsely punctured and pubescent; legs very long, testaceous, the basal joint of the hind tarsi 
much longer than the following joints united. 
Length 5 millim. 
Hab. GuatEMA.a, Calderas 6000 feet (Champion). 
At first sight, IZ. fusiformis appears to be only a colour-variety of MZ. elongatus; it 
is, however, more convex, broader, and more fusiform; the thorax is differently-shaped, 
the hind angles being very acute and extending outwards as far as the shoulders of the 
elytra, and the sides rapidly converging from the base; the punctuation of the elytra 
is more diffuse; the first joint of the hind tarsi is more elongate; and the pubescence 
is much longer and coarser. The two examples obtained agree precisely in colour; 
they are apparently both of the male sex. 
NACERDES. 
Nacerdes, Schmidt, Linn. Entom. i. p. 28 (1846) ; Lacordaire, Gen. Col. v. p. 705 *. 
Ischnomera, Stephens, Ill. Brit. Ent. v. p. 53 (1832) (pars). 
This genus contains a large number of species, mostly\from Europe or North Africa, 
those referred to it from other countries being in all probability not really congeneric. 
* For full synonymy see Lacordaire (op. cit.) &c. 
