PACHYBRACHYS. 153 
double TOWS of brown punctures, the sutural two more separated and enclosing a narrow elongate space, 
the portion near the scutellum with some irregularly distributed punctures and bounded by a more regular 
short row of punctures within, the interstices at the sides swollen but here and there interrupted by extra 
punctures ; underside and legs pale yellowish ; the breast (a spot at the sides excepted), and the middle 
of the abdomen, black. 
Hab. Guatemaus, Zapote, Duefias (mus. Stuttgart). 
The present insect, of which we have received two specimens from the Stuttgart 
Museum, very nearly agrees with Suffrian’s description of P. abdominalis (Say), but 
differs thus:—The upper surface is not yellowish-grey, but nearly white, the darker 
portions and markings of the head and thorax being pale brownish (instead of black); 
the thorax, in both specimens, has a M-shaped marking (of which Suffrian says nothing) ; 
and the elytral striz enclose strongly raised and shining interstices. 
Both examples have the breast black, and they are, no doubt, mature. 
33. Pachybrachys nigrofasciatus. (Tab. XXXIX. fig. 13.) 
Black 5 legs obseure fulvous ; thorax closely and strongly punctured, with three longitudinal black bands, the 
middle one divided anteriorly ; elytra deeply and regularly punctate-striate, the suture and two longitudinal 
bands on the disc black. 
Length 14 line. 
Hab. Mexico, Saltillo in Coahuila (Dr. Palmer). 
The presence of two longitudinal black bands on each elytron places P. nigrofasciatus, 
of which only a single specimen has been received, in a group containing about six 
species, from all of which it seems quite distinct. The head is closely punctured at its 
lower portion, fulvous, with the vertex, an elongate spot in the centre (widened at its 
middle), and a spot at the base of each antenna black; the antenne extend to a little 
beyond the middle of the body, and are black with the lower joints fulvous beneath. 
The thorax is not more than twice as broad as long, transversely convex, and strongly 
and closely punctured on the black portion, less so on the fulvous interspaces ; the 
broad black lateral bands are suddenly narrowed at the apex and extend nearly from 
the basal to the apical margin; the central band is widened anteriorly and divided by a 
narrow fulvous stripe to its middle. ‘The scutellum is black. The elytra are flavous, 
and very regularly punctate-striate; the suture is narrowly black and accompanied by 
a row of punctures for its entire length, this row being joined anteriorly to a short 
oblique one and followed by a subsutural row which curves outwards from the middle 
to the base; the discoidal black band is occupied by three rows of punctures, and is 
followed by a narrow costate flavous interspace placed between the next row and 
another black band occupying the next three rows of punctures; the flavous lateral 
space accompanying the margin is again impressed with a single row of punctures; the 
posterior portion of the lateral margin is black, the anterior portion flavous. The 
pygidium and the last abdominal segment are flavous, the rest of the underside black ; 
the legs fulvous. P. litigiosus, Suffr., differs from P. nigrofasciatus in the sculpture and 
BIOL. CENTR.-AMER., Coleopt., Vol. VI. Pt. 1, Suppl., November 1889.. x 
