PACHYBRACHYS. 139 
seem to differ in colour from those of P. bajulus. The markings of the head and thorax 
are exactly similar in the three specimens obtained. 
Pachybrachys scenicus (p. 66). 
To the locality Mexico, add :—Cuernavaca, Juquila (Sai/é), Amula, Omilteme, Chil- 
pancingo, Xucumanatlan in Guerrero (H. H. Smith). 
P. scenicus is not easy to distinguish from the darker varieties of P. labyrinthicus, 
and the two species seem to me to be somewhat doubtfully distinct. Both have an 
elongate-triangular, raised, smooth space at the suture near the middle, this space being 
rather shorter in the present insect than in P. labyrinthicus (this in itself is of no 
importance); the thorax does not seem to differ much in the two species, and is simi- 
larly marked in both (the markings being often obsolete in the paler specimens of 
P. labyrinthicus) ; but the sculpturing of the elytra seems certainly to differ considerably. 
In P. scenicus the black punctured striz are much more irregular and often interrupted 
by smooth yellow narrow spaces, so that it is almost impossible to convey a correct 
impression by a description of their direction. Suffrian gives the elytra as black and 
speaks of yellow spots; but it would be better to describe the elytra as yellow with 
black punctured strie, the latter placed thus :—two short curved striz surrounding the 
scutellum, the outer one connected with the third and ninth stria at the apex and 
including an elongate-triangular smooth space near the suture, and both abbreviated 
behind; the fourth and fifth strie closely approached and shorter than the preceding 
ones; the next pair of strie interrupted at and below the middle; the outer one 
parallel to the lateral margin, at some distance from it, and enclosing a smooth yellow 
space which extends from the shoulder to the apex, and is continued to the suture. 
These black striz are often united, forming elongate black markings here and there ; 
the underside for the greater part is black; the legs are fulvous, the femora with a 
black mark. P. labyrinthicus is generally much paler; it also has the elytral strie 
more regular (although nearly similar in direction to those of P. scenicus), and the 
triangular smooth sutural space longer and carried lower down. I also refer some 
smaller specimens from Omilteme and Xucumanatlan to the present species; some of 
them have the thorax much more closely punctured, but others are intermediate in 
this respect. 
7 (a). Pachybrachys inclusus. (Tab. XXXIX. fig. 3.) 
Black ; above yellow; the thorax with three black, elongate, partly divided, stripes; elytra with closely 
approached deep-black strie, often connected, forming three distinct black spots at the sides, and enclosing 
a rounded smooth yellow space near the suture at the middle; pygidium yellow, scarcely spotted; legs 
fulvous, the femora with a dark spot. 
Length 13-2 lines. 
Hab. Mexico, Cuernavaca (Sallé), Chilpancingo, Soledad in Guerrero (H. H. Smith). 
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