330 HETEROMERA. 
Hab. Mexico, Tuxtla (Sallé); Britis Hoxpuras, Belize, R. Sarstoon (Blancaneauz) ; 
GuatemaLa, Cahabon, Lanquin, Panzos (Champion); NIcaRAGua, Chontales (Belt, 
Janson) ; Panama (coll. F. Bates), Bugaba (Champion).—CotomB1a ; VENEZUELA; GUIANA, 
Cayenne!23; Peru; AMAzONS; BRAZIL. 
A very widely distributed insect, ranging almost over the entire forest-region of 
Tropical America; it appears to chiefly inhabit the low country, though sometimes 
ascending as high as from 2000 to 3000 feet. 
b. Upper surface dull black. 
2. Pyanisia tristis. 
Pyanisia tristis, Casteln. Hist. Nat. Ins. Col. ii. p. 236°. 
Cymatothes unicolor, Sol. Studi Entom. i. p. 182’. 
? Cymatothes tristis (Casteln.), Jacq.-Duval, in Sagra’s Hist. fisica polit. y nat. de Cuba, vii. Ins. 
p. 64°. , 
Cymatothes lugubris, Dej. Cat. 3rd edit. p. 230%. 
Hab. Muxico!?34, Ventanas (Forrer), Cordova, Tuxtla (Sallé), Jalapa (Hoge, 
Morrison), Las Vigas, Misantla, Tampico, Zapotlan, Tapachula in Chiapas (Hége) ; 
British Honpvras, Belize, R. Hondo, R. Sarstoon (Blancaneaux); GUATEMALA, Yzabal 
(Sallé), San Juan in Vera Paz, Cubilguitz, San Joaquin, San Gerdnimo, El Reposo, 
Zapote (Champion); Nicaraaua, Chontales (Belt, Janson); Panama, San Feliz, 'Tolé, 
(Champion).—Cvsa °. 
A common insect throughout our region, though apparently not extending south 
of the Isthmus of Panama. The two examples from the State of Panama have the 
elytral interstices perfectly flat. 
2. Base of the prothorax broadly and feebly arcuate. 
Upper surface dull black. 
3. Pyanisia opaca. 
Cymatothes opacus, Sol. Studi Entom. i. p. 180, t. 6. f1". 
Cymatothes coarctatus, Sol. loc. cit. p. 181°. 
Hab. Mexico? (coll. F. Bates), Pinos Altos in Chihuahua (Buchan-Hepburn), 
Ventanas (Forrer), Ciudad in Durango (Forrer, Hoge), Refugio in Durango, Las Vigas 
(Hoge), Jalapa (Hége, Morrison), San Andres Chalchicomula, Oaxaca, Chiapas (Sad/é), 
Mochitlan in Guerrero (Baron). 
This insect is generally distributed and not uncommon in Mexico, extending as 
far north as the States of Durango and Chihuahua. In the large series of examples 
(120) before me a great deal of variation is to be found, and I am unable to distin- 
guish more than one species. Cymatothes coarctatus, Sol., was, I have little doubt, 
