242 SEEEICOENIA. 



NEMATODES. 



Nematodes, Latreille, Earn. Nat. p. 248 (1825) ; de Bonvouloir, Mon. des Eucnemides, p. 644. 

 Sphcerocephalus , Eschscholtz, in Silberm. Rev. Exit. iv. p. 4 (1836). 



The species of this genus are quite readily recognized by their facies ; this, together 

 with the acute prolongation of the last ventral segment and the excavate-emarginate 

 fourth tarsal joint, will enable them to be separated almost at a glance. 



1. Nematodes mexicanus. 



Galba mexicana, Cast, in Silberm. Rev. Eat. iii. p. 174 \ 

 Nematodes mexicanus, de Bonv. Mon. p. 648, t. 31. fig. 3 2 . 



Hah. Mexico 1 , Cordova 2 , San Andres 2 , Playa Vicente 2 (Salle), Cerro de Plumas, 

 Jalapa (Hoge), Atoyac in Vera Cruz (H. H. Smith)-, Beitish Hondueas, R. Sarstoon 

 (Blancaneaux) ; Guatemala, Yzabal, Panzos, Teleman, Chacoj, and Cubilguitz in Vera 

 Paz, Zapote (Champion); Costa Rica, Volcan de Irazu (Rogers); Panama, Bugaba 

 (Champion). 



This species is known by the presence of a short but distinct carina limiting the 

 antennal depression distinct from the lateral margin. A variety litigiosus has been 

 described from Cayenne which has not been observed within our limits. 



2. Nematodes mannerheimi. 



Nematodes Mannerheimii, de Bonv. Mon. p. 651, t. 31. fig. 4 1 . 



Hah. Mexico, Cordova 1 , Playa Vicente 1 , Santecomapan (Salle), Cerro de Plumas 

 (H'oge) ; Panama, Tole (Champion). 



Similar to N. mexicanus, but without the short carina, and differs from the next by 

 having an indication of a carina at the inner angle of the antennal fovea. 



3. Nematodes cuneatus. 



Emathion cuneatum, Guerin, Ann. Soc. Ent. Fr. 1843, p. 179 1 . 

 Nematodes cuneatus, de Bonv. Mon. p. 655 2 . 



Hob. Mexico, Cordova (Salle 2 ) ; Nicaeagua, Chontales (Belt) ; Costa Rica, Cache 

 (Rogers); Guatemala, Teleman in Vera Paz (Champion); Panama, Bugaba, Volcan de 

 Chiriqui, Tole (Champion). — Guiana, Cayenne 2 ; Amazons, Ega 2 ; Beazil 2 , Bahia 1 . 



The elytra vary in sculpture, and may be faintly or not striate. In size it varies 

 from 7 to, 15 millim. 



4. Nematodes atropos. 



Eucnemis atropos, Say, Trans. Am. Phil. Soc. vi. p. 187. 



Emathion atropos, Lee. Proc. Acad. Phil. vi. p. 47; Trans. Am. Phil. Soc. x. p. 414. 



