PACHYBEACHYS. 69 



14. Pachybrachys umbraculatus. (Tab. IV. fig. 14.) 



Pachybrachys umbraculatus , Suffr. Mcmogr. vii. p. 213 l . 



Above yellowish, a few longitudinal lines on the thorax, the suture, and a pair of narrow stripes on the elytra 

 black ; below black ; shoulders and the abdominal sides yellow ; legs yellowish white ; thorax unevenly 

 and coarsely punctured ; elytra regularly punctate-striate, with sinuate, partly interrupted interstices. 



Length 2 lines. 



Edb. Mexico, Jalapa 1 (Sallti). 



The type from the Berlin Museum, which is before me, agrees completely with the 

 description of Suffrian; another, from M. Salle's collection, is lighter— the sixth and 

 seventh rows of the elytra, which in the type are abbreviated by a broad smooth space, 

 are here nearly united ; but I fail to find any other differences of importance. 



15. Pachybrachys gregarius. (Tab. IV. fig. 13.) 



Pachybrachys gregarius, Suffr. Monogr. vii. p. 215. 



Larger than P. umbraculatus. The elytra marked with black and white, and the first striae surrounding a large 

 triangular smooth space near the suture. 



Eab. Mexico 1 , Cuernavaca, Juquila {Salle). 



The type in the Berlin Museum, which Dr. Peters has kindly lent me for comparison, 

 is a male, not a female, as Suffrian says. Three others, also males, are before me from 

 M. Salle's collection, which show no material difference. Two other specimens, however, 

 are smaller and lighter-coloured. The species is not difficult to recognize, on account 

 of its elongate triangular space on the elytra, and the strongly marked colour of the 

 latter and of the thorax (which distinguishes it at the same time from P. labyrinthicus). 



16. Pachybrachys regularis. (Tab. IV. fig. 15.) 



Elongate, subdepressed ; below yellow or black; above yellowish white, the thorax with a distinct M-shaped 

 mark; elytra subgeminate punctate-striate, yellow, with longitudinal, more or less interrupted, dark- 

 brown interstices. 



Length 2 lines. 



Head yellow, with the base and a longitudinal central line, which divides further down into two branches, deep 

 brown ; the light parts impunctate ; antennae of about half the length of the body, with the third joint twice 

 as long'as the second, and the fourth joint nearly double as long as the third, black, the basal joints lighter ; 

 thorax yellow, with a very dark-coloured well-defined M-shaped mark enclosing on each side another, 

 smaller spot of the ground-colour— the dark places closely, the light ones more remotely punctured ; 

 scutellum yeUow, margined with brown ; elytra subdepressed, slightly transversely depressed towards the 

 middle, with the following punctured dark-brown striae :— two sutural ones, running nearly parallel with 

 each other, but dividing near the middle, where they enclose a short widened space, and finishing at some 

 distance from the apex ; the next pair of striae are much shorter, and finish a little below the middle ; the 

 foUowing pair are a little longer, and interrupted near the middle by a narrow, transverse, smooth place ; 

 the last pair are narrowed, or approaching each other, near the middle, and, after curving inwards near the 

 apex, finish in a line with the first pair of striae ; all the spaces included by these punctures are deep 

 brown, but interrupted here and there by the raised smooth ground-colour, which fills out the rest of the 

 intervals between the striae ; the extreme lateral and sutural margins are also dark brown ; but the apex 

 remains yellow : pygidium of the same colour, with a short longitudinal central line ; underside and legs 



