PACHYBEACHYS. 67 



8. Pachybrachys irregularis. (Tab. IV. fig. 12.) 



Pachybrachys irregularis, Suffr. Monogr. vii. p. 196 \ 



Eab. Mexico, Oaxaca \ Etla, Cordova, La Parada, Cuernavaca, Orizaba (Salle) ; 

 Guatemala, San Geronimo, Zapote, Duefias (Champion). 



The long antennae and the raised smooth triangular patch near the suture of the 

 elytra will help to distinguish this species from others, although the latter character is 

 common to several other species. Some specimens from Etla which are before me are 

 larger and paler than the type in the Berlin Museum, but do not differ materially in 

 other respects. 



■9. Pachybrachys labyrinthitis. 



Pachybrachys labyrinthitis, Suffr. Monogr. vii. p. 197 \ 



Above obscure yellowish white, with black regularly punctured strise; below black, with the shoulders and the 

 sides of the abdominal segments white ; thorax unevenly and coarsely punctured, the elytra nearly regu- 

 larly punctate-striate, with distinct longitudinal costse. 



Length 1^ line. 



Eab. Mexico 1 : Guatemala, Duefias (Champion). 



The above is the substance of Suffrian's diagnosis of this species, which he principally 

 distinguishes by the regularity of the strise of the elytra. In his long description (the 

 species differing but little from many others) he says, in speaking of the elytra, that they 

 have ten nearly regular strise, but that the inner ones near the base are a little confused, 

 that the second turns obliquely inwards and returns again further on, inclosing thereby a 

 smooth space (which is also the case with P. irregularis) and that the ninth stria is 

 curved above the lateral margin. All this does not seem to imply that regularity upon 

 which Suffrian lays principal stress in distinguishing the species. Through the kind 

 loan of the specimens of this species, as well as those of P. irregularis in the Berlin 

 Museum from which Suffrian's descriptions were drawn, I find the principal and somewhat 

 doubtful difference between the two insects to lie in the widened space near the suture 

 of the elytra, which in the present species is drawn out into a longitudinal space, the 

 corresponding part in P. irregularis consisting of a round-shaped space ; but I have 

 great doubt of the two species being really distinct. 



10. Pachybrachys nebulosus. 



Pachybrachys nebulosus, Sufir. Monogr. vii. p. 202. 

 Hab. Mexico, Vera Cruz. 



Suffrian distinguishes this species from others, and specially from P. obsoletus, by the 

 black underside, the much more irregular punctured stria? of the elytra, and the 

 small size, which does not exceed a line. The description was drawn from a female 



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