20 PHTTOPHAGA. 



2. Mastostethus nigrocinctus. 



Megalopus nigrocinctus, Chevr. Col. Mex. cent. i. no. 77 1 ; Lacord. Mon. p. 617. 

 Megalopus variabilis, Dej. Cat. 3rd ed. p. 385. 



Hab. Mexico, Almolonga {Edge), Cordova 1 ; Guatemala, Zapote (Champion); 

 Nicaeagua, Chontales (Belt). 



Lacordaire has enumerated six varieties of this species. Amongst the specimens 

 from Guatemala a good many have the elytral black band reduced to four small 

 transversely placed spots, while in others even these are entirely wanting. This 

 species may be best distinguished from M. balteatus by the much more distant and 

 also finer punctuation of the elytra, which is constant in the numerous specimens 

 I have examined. 



3. Mastostethus cingulatus. 



Mastostethus cingulatus, Lacord. Mon. p. 618. 

 Hab. Mexico. 



4. Mastostethus bilobus. 



Mastostethus bilobus, Lacord. Mon. p. 619. 



Hab. Mexico, Tabasco ; Beitish Honduras, K. Sarstoon (Blancaneauoc); Guatemala, 

 Panima in Vera Paz (Champion). 



The red underside, head, and margin of the thorax are the principal characters which 

 distinguish this species from M. nigrocinctus. The colour of the legs varies from black 

 to rufous. One specimen, from Vera Paz, is, with the exception of the black elytral 

 marks, entirely of a rufo-testaceous colour. 



5. Mastostethus duplocinctus. 



Mastostethus duplocinctus, Clark, Cat. Phyt. App. p. 71. 

 Hab. Mexico. 



6. Mastostethus tricinctus. 



Mastostethus tricinctus, Lacord. Mon. p. 626. 

 Hah. Mexico. — Colombia. 



7. Mastostethus fraternus. (Tab. II. fig. 11.) 



Mastostethus fraternus, Baly, Cist. Ent. ii. p. 128 1 . 

 Hab. Nicaeagua, Chontales (Belt). — Beazil 1 . 



The Nicaraguan specimens before me agree in every respect with the Brazilian type. 

 Mr. Baly has pointed out the difference between this species and M. bicolor. I 

 may further add that the anterior margin of the black part of the elytra is rather 



