MONOCLEUS.—GYMNOGNATHUS. 335 
Hab. Mextco!, Sierra de Durango? (Mus. Tring), Cerro de Plumas (Hoge) ; 
Guatemata, Cerro Zunil, Capetillo (Champion). 
A. small series. 
3. Monocleus gracilis, sp.n. (Tab. XI. figg. 21, 21a.) 
3. Close to M. idwus; larger ; rostrum with vestige of mesial carina; eyes larger, farther apart ; ninth 
segment of antenna longer; pronotum with conspicuous mesial vitta, carina convex in middle and again 
near sides; tubercles of elytra higher ; legs black, with a narrow sub-basal ring on the tibie and the basal 
half of the first tarsal segment rufous, pubescent-grey ; abdomen villose beneath. 
Length 5 millim. 
Hab. Mzxico, Omilteme in Guerrero 8000 feet (H. #. Smith). 
One male. 
4. Monocleeus lioderes, sp. n. (Tab. XI. figg. 22, 22a.) 
2. Brownish-black, pubescent luteous-grey above, grey beneath, densely marmorated and irrorated with 
brown. Rostrum very densely punctate-rugate, somewhat dilated at apex, longer than broad, apical 
margin sinuate. Head plicate; frons one-third the width of the rostrum. Eye half as long again as 
broad. Antenne brown, base of first segment and apex of last rufous; segment 9 longer than broad, 
10 twice as broad as long, 11 as long as 9. 
Prothorax half as broad again as long, impunctate above, except a few indistinct punctures laterally, sides 
rounded behind, the carina being laterally evenly curved forward, oblique basal longitudinal carina very 
distinct. Elytra deeply punctate-striate, snterstices somewhat convex, two heavy tubercles situated in 
third interstice, the one near the base, the other behind middle, black-brown, clayish-coloured in front 
and behind. Underside without distinct punctures. Legs spotted with clay-coloured dots; tarsi rufous, 
second segment and apex of first brown. 
Length 64 millim. 
Hab. Panama, Volcan de Chiriqui (Champion). 
One female. This species is not a true Monocieus. It combines to a certain 
extent the characters of this genus, Homocleus, and Goniocleus, differing from 
Goniocleus in the non-angulate mesosternal process, from Homocloeus in the absence of 
a mesial carina from the rostrum, and from both Homocleus and Monocleus in the 
antebasal carina of the pronotum being curved forward to the middle of the side, and 
in the longitudinal basal carina being very distinct. 
XVIII. GYMNOGNATHUS. 
Anthribus, Germar, Ins. Spec. Nov. p. 177 (1824) (partim). 
Anthribus (Gymnognathus) , Schoenherr, Cure. Disp. Meth. p. 37 (1826) (typus: ancora). 
Gymnognathus, Schoenherr, Gen. Spec. Cure. i. p. 163 (1833) ; Lacord. Gen. Col. vil. p. 525 
(1866) ; Gemm. & Harr. Cat. Col. ix. p. 2731 (1872). 
Range: South and Central America ; species very numerous. 
3g Q. Rostrum more or less porrect, flat, widest at apex ; labium truncate or emarginate. Antennal groove 
prolonged downwards, curved. Eye large, lateral, entire, finely granulate. Carina of pronotum widely 
separate from base. Elytra more or less strongly flattened at suture, basal edge of each strongly rounded, 
projecting forward. 
