PACHYBRACHYS. 151 
Suffrian gives both the above localities for this species, which was overlooked by me 
in the earlier portion of this work. No Pachybrachys from Central America agreeing 
with the author’s description has come under my observation. 
29. Pachybrachys livens? (Tab. XXXIX. fig. 11.) 
. Pachybrachys livens, Lec. Proc. Ac. Phil. 1858, p. 84°. 
Hab. Nortu America, California }.—Mexico, Northern Sonora (Morrison). 
The specimens obtained in Sonora by the late Mr. Morrison and named by himself 
P. livens agree nearly, but not entirely, with Leconte’s description; and I can only 
therefore refer them doubtfully to his species. The Sonoran examples are of a very 
pale testaceous colour (in which they agree with the description); the thorax and 
elytra are very closely and irregularly punctured, the latter with scarcely any arrange- 
ment of the punctures in rows, except at the posterior portion, where traces of strie are 
visible (Leconte says that the rows are regular but closer than usual and confused near 
the suture); the breast and sometimes part of the abdominal segments are usually 
darker (of which Leconte says nothing); and of an occasional testaceous spot on the 
‘middle of the thorax (as mentioned in the description) there is no trace in any of the 
twelve specimens before me. : 
30. Pachybrachys sonorensis. 
Black ; above dull flavous; thorax very closely punctured, mottled with dark brown ; elytra closely and irre- 
gularly punctured almost throughout, without longitudinal coste, the sides and the disc with some obscure 
spots; pygidium black, with two yellow spots ; legs fulvous, spotted with black and white. 
Length 14-1? line. 
Hab. Mexico, Northern Sonora (Morrison). 
Of this, somewhat doubtful, species we have received two specimens, which, owing to 
the almost entire absence of elytral coste, I cannot well refer to any yet described. 
The head has the usual black vertical and central mark, and is closely punctured ; the 
antenne (@ ) extend to about half the length of the body, and are black with the basal 
joints fulvous. The thorax is short, nearly three times as broad as long, with rounded 
sides and a rather closely punctured disc, the latter having the usual obscure dark lateral 
and central bands. The elytra are everywhere impressed with black punctures which 
are arranged here and there in ill-defined rows, but the interstices show no trace of 
longitudinal coste, either laterally or near the apex; they are of a dull opaque fuscous 
colour, interrupted by three obscure flavous spots near the lateral margin, the apex 
being of the same colour (if viewed under a lens, the flavous ground-colour is every- 
where visible between the punctures). The pygidium is entirely black, closely pubes- 
cent, and has two small yellow spots near the apex; the underside is also entirely black, 
with a more or less distinct yellow spot on the last segment. The nearest allied species 
to P. sonorensis seems to be P. maculicollis; but this latter is of entirely different 
