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OXACIS. 161 
20. Oxacis rugicollis. 
Klongate, opaque, thickly clothed with fine ashy pubescence; the head piceous; the prothorax piceous-brown, 
with the basal and apical margins fusco-testaceous ; the elytra brownish, a little darker at the extreme base. 
Head densely and coarsely punctured, rugosely so in front; antenne piceous, the basal joint rather longer 
than the third, the eleventh joint strongly constricted at the middle; prothorax longer than broad, convex, 
the sides much rounded anteriorly, constricted at the middle, and thence to the base converging, the disc 
very shallowly depressed on either side anteriorly, and with traces of a smooth median line at the base, 
the surface very densely and coarsely punctured; elytra scabrous-punctate, and with two feebly raised 
lines on the disc; beneath densely and finely punctured, piceous; legs testaceous, the apices of the femora 
and the tarsi piceous. 
- Length 7 millim. (9.) 
Hab. Mexico, Ventanas in Durango (Hoge). 
One example. An obscurely-coloured species allied to 0. cana, O. plumbea, &c. ; 
but differing from these in the very dense and almost rugose punctuation of the head 
and thorax. The apical joint of the maxillary palpi is subcultriform. 0. fuliginosa, 
Lec., from Cape San Lucas, to judge from the description, is somewhat allied to 
O. rugicollis; but differs from it in the more triangular apical joint of the maxillary 
palpi, finer punctuation, &c. 
Oxaers ) 
21. Oxacis coahuile. 
Very elongate, opaque, thickly clothed with rather long, coarse, ashy pubescence ; the head and prothorax testa- 
ceous or brownish-testaceous, the former usually with the middle of the vertex infuscate, the latter with a 
median vitta and the sides, more or less, fuscous or piceous; the elytra piceous-brown or piceous 
(with an eneous lustre when denuded of pubescence), with the suture, and sometimes the lateral 
margin also, pale flavous or pale testaceous. Head densely and finely punctured, the eyes and the tips of 
the mandibles black or piceous; antenne testaceous or fusco-testaceous, joint 1 a little longer than 3, 
11 constricted at the middle; prothorax convex, longer than broad, the sides moderately rounded 
anteriorly and gradually converging behind, the disc depressed in the middle before the base, the base very 
feebly-emarginate in the centre, the surface densely, finely, and uniformly punctured, and sometimes with 
traces of a smooth median line; elytra densely and finely punctured, and with two raised lines on the 
disc; beneath densely and finely punctured, piceous-brown, the prothorax testaceous; legs testaceous, the 
tarsi sometimes a little darker. 
Length 7-9 millim. (¢ 2.) 
Hab. Mexico, Parras and Monclova in Coahuila (Dr. Palmer). 
Found in abundance by Dr. Palmer in Northern Mexico. Of similar elongate shape 
to O. cana, but differing from that species in the coarser and longer pubescence, less 
scabrous elytra, more finely punctured thorax, the latter more gradually narrowed 
from the middle to the base, &c. In its coarse pubescence the present insect 
approaches 0. sericea, Horn, from California, and O. pallida, Lec., from Texas. ‘The 
last joint of the maxillary palpi is subcultriform, its inner side much shorter than its 
apical side. 
22. Oxacis trimaculata. (Tab. VII. fig. 20.) 
Elongate, opaque, thickly clothed with short fine ashy pubescence; the head and prothorax flavo- or reddish- 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 2, June 1890. YY 
