66 LAMELLICOENIA. 



Hab. Mexico, Mazatlan, Guanajuato {Salle), Colima city (Edge). 



A female in the Salle collection from Guanajuato, labelled, like the male, " nov. sp.," 

 differs in nothing from the female of P. damon. A fully-developed male from Mazatlan 

 is figured. 



ONTHOPHAGUS. 



Onthophagus, Latreille, Gen. Crust, et Ins. iii. p. 141 (1807); Lacordaire, Gen. Col. iii. p. 107; 

 Erichson, Naturgesch. Ins. Deutschl. iii. p. 763; Lansberge, Stettin, ent. Zeit. 1883, p. 161. 



A genus remarkable for the almost endless diversity and eccentricity displayed 

 in the armature of the males. Nearly six hundred species have been described, and in 

 all, with very few exceptions, the horns, protuberances, and processes exhibit individual 

 variations, the rule governing which is not easily traceable. America, North and 

 South, seems to contain much fewer species than the Old World, the tropical regions 

 of Africa and Asia furnishing the greater number, as well as the largest and most 

 richly decorated forms. 



1. Onthophagus curvicornis. 



Onthophagus curvicornis, Latr., Humboldt et Bonpland, Obs. Zool. i. p. 220, t. 23. f . 2 ' ; Harold, 

 Stett. ent. Zeit. 1880, p. 29 2 . 



Hab. Mexico 2 , Cordova (Salle), Mexico city, Zacualtipan, Tampico, Jalapa, Oaxaca 

 (Hoge) ; Bbitish Honduras, E. Sarstoon (Blancaneaux) ; Guatemala (Salle), Cerro 

 Zunil, Capetillo, Zapote, Balheu, San Geronimo (Champion) ; Costa Eica, Volcan de 

 Irazu (Bogers); Panama, Bugaba, Volcan de Chiriqui (Champion). — South America, 

 Colombia 2 , Venezuela 2 , Ecuador 1 . 



All the examples from the Volcan de Chiriqui and Bugaba are of an indigo or slaty- 

 blue colour. Similarly coloured varieties occur also in Mexico, but the Chiriqui form 

 further differs in being rather less shining than the others. 



2. Onthophagus incensus. 



Onthophagus incensus, Say, Bost. Journ. Nat. Hist. i. p. 173 1 ; Complete Writings, ii. p. 647; 

 Harold, Stett. ent. Zeit. 1880, p. 30 2 . 



Hab. Mexico 1 , Campeche in Yucatan, Cordova, Orizaba, Cuernavaca, Tuxtla, Playa 

 Vicente, Vera Cruz, Chiapas (Salle), Frontera and San Juan Bautista in Tabasco, 

 Yautepec, Guadalajara, Jalapa, Oaxaca (Hoge) ; Guatemala (Salle), El Tumbador, El 

 Eeposo, Las Mercedes, Cerro Zunil, Pantaleon, Zapote, Capetillo, Cubilguitz, San 

 Geronimo (Champion) ; Honduras (Salle) ; Nicaragua, Granada (Salle), Chontales 

 (Belt, Janson) ; Panama, Colon (Janson). 



According to Von Harold 2 the only difference between 0. curvicornis and O. incensus 

 lies in the form of the anterior protuberance of the thorax in the male, the protuberance 



