306 RHYNCHOPHORA. 
1. Ischnocerus infuscatus. 
Ischnocerus infuscatus, Fahr. in Schoenh. Gen. Spec. Cure. v. p. 192. n. 1 (1839) *; Gemm. & 
Har. Cat. Col. ix. p. 2726 (1872) *. 
Anthribus tenuicornis, Fahr. 1. c.* (Dupont in litt., ex Dejean, nom. nud.). 
Meconemus tuberculatus, Labr. & Imh. Gen. Cure. i. no. 40 (1842) *. 
Ischnocerus tuberculatus, Gemm. & Har. 1. c.’. 
The figure of J. tuberculatus agrees with the present insect, which is the only one common in Mexico. 
The individuals from Guatemala, Nicaragua, Costa Rica, and Panama differ from those before me from 
Honduras, Yucatan, and Mexico proper in having the carina of the pronotum more strongly angulate in 
the middle, the disc of the pronotum and the sutural area of the elytra more depressed, the apex of the 
latter rather more suddenly declivous, the second interspace wider than the first between the anteapical 
tubercles, and the posterior tufts more or less tawny. These differences are, however, by no means 
constant. 
Hab. Mexico}, Toxpam, San Andres Tuxtla (Sallé), Acapulco, Almolonga, Jalapa, 
Cerro de Plumas, Cordova, Oaxaca (f/ége), Temax in N. Yucatan (Gaumer); Britis 
Honpuras, Belize, Rio Hondo, Rio Sarstoon (Blancaneaux); GuaTEMALA, Yzabal 
(Sallé), Panzos, Teleman, Chacoj, San Juan, and San Gerénimo in Vera Paz, El Reposo, 
Las Mercedes (Champion); Honpuras, San Pedro Sula (Wettkugel) ; Nicaragua, Chon- 
tales (Belt, Janson); Costa Rica (Mus. Tring); Panama, Bugaba, Volcan de Chiriqui 
(Champion). | 
2. Ischnocerus impressicollis. (Tab. X. figg. 5, 5a.) 
Ischnocerus impressicollis, Jordan, Stett. ent. Zeit. lvii. p. 373. n. 7 (1896) °. 
Only one specimen of this insect is known. It differs from all individuals of the preceding species in having 
the sides of the disc of the pronotum more strongly raised, the carina rather widely interrupted, the 
sutural area of the elytra less depressed, the rostrum, the middle of the pronotum, the tip of the elytra, 
and the pygidium clothed with a purer white pubescence, &c. 
Hab. Mexico, Cuernavaca ! (ex coll. Boucard, in Mus. Tring). 
3. Ischnocerus consors, sp. n. (Tab. X. figg. 7, 7a.) 
3. Close to I. enescens, Jord. (1895). Rostrum narrower; antennal groove rather larger; pronotum more 
strongly narrowed from carina to apex, with a white mesial line from the tubercle to apex, sides of disc 
less elevate ; elytra with four (instead of five) tubercles in the third interspace, basal tubercle somewhat 
narrower and shorter than in J. wnescens, the second halfway between the first and third, the latter 
standing just before the apical declivity, a very little broader than the third interspace is in the middle, 
fifth interspace also with four tubercles, the first standing about midway between the first and second of 
the third interspace, the second midway between the second and third of that interspace, the other two a 
little further back than the respective tubercles of the third space. 
Length 5 millim.* 
Hab. Panama, Caldera in Chiriqui (Champion). 
One male. 
* In measuring the length the head is excluded. 
