448 HETEROMERA. 
Lystronychus morio, Chevr., in the Sallé collection ; it differs, however, from Lystrony- 
chus in the lobed penultimate joint of the tarsi, apterous body, &c. An apterous 
undescribed genus allied to Lystronychus, from Bolivia, somewhat approaches it. 
2. Phedius carbonarius, (Tab. XX. fig. 19, 2.) 
Rather elongate, black, opaque, clothed with long scattered suberect hairs. Head densely and rather coarsely 
punctured, the transverse frontal depression large and deep; antenne stout, black ; prothorax subquadrate, 
transverse, a little rounded at the sides before the middle, feebly and about equally narrowed before and 
behind, the hind angles rather obtuse, the base subtruncate, the disc shallowly longitudinally impressed 
in the middle behind, the basal fovew obsolete, the surface coarsely and rugosely punctured; scutellum 
sparsely punctured ; elytra with rows of fine punctures placed upon very fine obsolete striz, the punctures 
rather distinct one from another, the interstices quite flat and each with two rows of scattered similar 
punctures, the punctures becoming finer towards the apex and coarser towards the base; beneath finely 
and sparsely punctured ; legs stout, roughly punctured and pubescent, black. 
Length 83 millim.; breadth 33 millim. (@.) 
Hab. Mexico, Tula in Hidalgo (Hoge). 
A single female example. This species may be at once identified from all others of 
the genus, except P. chevrolati, by the upper surface being clothed with long scattered 
suberect hairs; and from P. chevrolati by its more elongate shape, more slender 
antenne, less rugose thorax, and more regularly punctured elytra. From abraded 
P. funestus it is distinguished by the punctures of the elytral interstices not being 
finer than those of the strie. 
2. Upper surface subglabrous (or, in freshly-emerged examples, clothed 
with short pubescence). 
a. Prothorax and the elytral interstices finely and sparsely punctured. 
3. Phedius hidalgoensis. 
Piceous-black, dull, subglabrous. Head finely and rather sparsely punctured, the transverse frontal depression 
large and deep ; antenne rather short, fusco-ferruginous ; prothorax much broader than long, transversely 
. convex, a little rounded at the sides and about equally narrowed before and behind, the hind angles 
rounded, the base somewhat rounded and distinctly emarginate in the middle and sinuate on each side, 
the basal fovere deep and oblique and extending outwards, the disc broadly and rather deeply longi- 
tudinally impressed in the middle behind, the surface finely (but deeply) and sparsely punctured ; 
scutellum with a few scattered punctures ; elytra broad, finely and shallowly punctate-striate throughout, 
the interstices flat and with widely scattered very shallow fine punctures, the punctures finer than those 
of the stria; beneath very sparsely punctured, the ventral surface with a few very widely scattered 
minute punctures ; legs pubescent, rather stout, piceous, the tarsi ferruginous. 
Length 9 millim.; breadth 32 millim. 
Hab. Mexico, Tula in Hidalgo (Hége). 
One specimen only. The transversely convex and sparsely punctured thorax at once 
distinguishes this species from the others of the genus. 
