RATUS., 447 
Nine specimens. The exceedingly coarse sculpture of the prothorax, with a smooth 
dilated space down the middle, and the anteriorly constricted and depressed elytra, 
with the alternate interstices only finely costate, sufficiently distinguish 4. ebeninus. 
The elytra have the dull glossy appearance of those of Oncorrhinus latipennis. 
2. Matus rugicollis, sp. n. 
Subovate, black, the tarsi and antenne reddish; opaque above, the elevated portions of the surface only 
shining; sparsely clothed with rather long, semierect, ochreous sete. Head with a few punctures above 
the eyes, the latter depressed and almost contiguous above; rostrum moderately stout, strongly curved, a 
little longer than the prothorax, somewhat gibbous at the base, punctato-sulcate at the sides, the smooth 
raised space down the middle widening forwards, the antenne inserted at about one-third from the tip. 
Prothorax transversely quadrate, abruptly narrowed in front, bisinuate at the base; coarsely, rugosely 
punctate, the punctures here and there confluent, and towards the apex separated by longitudinal rugee, 
the smooth median space widening forwards. Elytra oblong-cordate, the humeri rounded; seriate- 
punctate, the punctures oblong in shape and placed in shallow striw, the interstices 3, 5, and 7 narrowly 
and finely costate, the others also feebly costate at the base and towards the sides. Beneath a little more 
finely punctured than in Z. ebeninus. Legs as in 4%. ebeninus, the femora feebly unidentate. 
Length 44, breadth 23 millim. 
Hab. Panama, Volcan de Chiriqui (Champion). 
One specimen. More oblong than 4. ebeninus, the prothorax less coarsely sculptured, 
the elytra neither depressed nor constricted below the base. Compared with . cos- 
tulatus, the prothorax is more strongly, longitudinally rugose, with the smooth median 
space widening forwards, and the second and fourth elytral interstices are feebly costate 
at the base only. 
3. Matus costulatus, sp.n. (Tab. XXII. fige. 4, 4a, bd; 4¢, hind leg.) 
Subovate, black, the antenne and tarsi, and sometimes the elytra, femora, and tibiw also, reddish; opaque 
above, the elevated portions of the surface only shining; sparsely clothed with rather long, semierect, 
ochreous sete. Head with a few punctures clustered above the eyes, the latter depressed and almost 
contiguous above; rostrum short, curved, a little longer than the prothorax, gibbous at the base, 
tricarinate, the median carina widening forwards, the sides sulcate, the antenne inserted at one-third 
from the tip. Prothorax transversely quadrate, abruptly narrowed in front, bisinuate at the base ; 
coarsely, rugosely punctate, the punctures here and there confluent, the dise with a narrow median 
carina. Elytra feebly constricted below the rounded humeri; seriate-punctate, the punctures oblong in 
shape and placed in shallow strie, the interstices 3, 5, and 7 finely and narrowly, and the others more 
feebly, costate. The under surface and legs as in A’. ebeninus. 
Length 34-34, breadth 14-23 millim. 
Hab. Mexico, Teapa (H. H. Smith), Tapachula (Hoge); Britmisa Honpvras 
(Blancaneaux); GuaTeMaLa, Zapote (Champion); Panama, Bugaba, Volcan de Chiriqui 
(Champion). | 
Hight specimens. The tricarinate rostrum, the less rugosely sculptured prothorax, 
the more distinctly costate and more closely setose elytra, and the almost obsolete post- 
basal depression of the latter, separate 44. costulatus from 4. ebeninus. 
