158 : HETEROMERA. 
narrow lines down the middle of the disc testaceous, or brownish-testaceous and with the lines indistinct. 
Head finely and rather closely punctured, the eyes and the tips of the mandibles piceous; antenne 
piceous-brown, or testaceous with the apex of each joint darker, rather stout, joints 1-3 about equal in 
length, 11 constricted at the middle; prothorax longer than broad, the sides moderately rounded anteriorly 
and converging behind, the dise depressed in the middle before the base, and with a rather large rounded 
depression on each side anteriorly, the base slightly emarginate in the centre, the surface finely and closely 
punctured ; elytra densely punctured, and with two slightly raised lines on the dise; beneath densely and 
finely punctured, testaceous or reddish-testaceous, the venter a little darker; legs piceous with the basal 
two-thirds of the femora testaceous, or testaceous with the tarsi and the apices of the femora and tibiz 
piceous-brown. 
Length 73-83 millim. (¢ @.) 
Hab. Mexico, Oaxaca (Hége). 
Two examples. This species is allied to O. pallida, Lec., but differs from it in the 
shining, less densely punctured, and unicolorous head and thorax, finer pubescence, &c. 
The above description, except as regards colour, is chiefly taken from the dark-coloured 
female example; the unique male appears to have the head and thorax abnormally 
formed, the latter being not so long as broad, and having the discoidal impressions 
deeper than in the female, and the former longitudinally grooved between the eyes. 
16. Oxacis angustata. 
Very elongate, narrow, finely pubescent; the head and prothorax slightly shining, piceous-brown, the former in 
front, at the base, and at the sides behind, and the latter with an indeterminate longitudinal space on 
either side of the disc, testaceous; the elytra opaque, piceous-brown, the suture a little lighter. Head 
densely and finely punctured, the eyes black ; antennex piceous-brown, very long in the male, much shorter 
in the female, joints 1-3 about equal in length, 11 constricted at the middle; prothorax longer than broad, 
the sides moderately rounded anteriorly and gradually converging behind, the disc depressed in the middle 
before the base and with a rather large but shallow oblique depression on each side anteriorly, the base 
and apex feebly emarginate in the centre, the surface densely and finely punctured ; elytra very elongate, 
subparallel, densely and finely punctured, and with three raised lines on the disc; beneath piceous-brown, 
densely and finely punctured; legs piceous-brown, the basal two-thirds of the. femora and the coxe 
testaceous. 
Length 83-10 millim. (¢ 2.) 
Hab. Mexico, Tehuacan (/ége). 
One female and three male examples. This is a very elongate, natrow, moderate- 
sized, obscurely-coloured species not very closely allied to any other here enumerated, 
except O. variegata and the following, O. lineatula. The more finely punctured 
surface, less opaque elytra, the lines on which are more distinctly raised, and different 
colour distinguish it from any of the varieties of 0. cana. The apical joint of the 
maxillary palpi is cultriform, its apical side much longer than the inner side. 
17. Oxacis lineatula. (Tab. VII. fig. 17, ¢.) 
Elongate, narrow, finely pubescent, slightly shining; pale brown or brownish-testaceous, the head in the middle, 
the disc and sides of the prothorax, and the sides of the elytra broadly (and sometimes the suture on 
either side for a short distance below the scutellum), fuscous or piceous-brown. Head densely and finely 
punctured, the eyes and the tips of the mandibles black ; antenne brown or piceous-brown, with the two 
«basal joints (and sometimes the extreme apex of the others) testaceous, very long in the male, shorter in 
