334 LAMELLICOKNIA. 



male ; but the size (17 lines) and the length of the cephalic horn are not those of this 

 class of male in G. pizarro, though agreeing well with G. imperialis. 



We figure a fully-developed typical male from Tuxtla, and four others of the same 

 sex of the var. clavicornis, from Toxpam, Cordova, and Jalapa, showing the different 

 developments of the cephalic and thoracic horns, and also the variation in the sculpture 

 of the upper surface. 



2. Golofa imperialis. (Tab. XX. figg. 8, 8 a, 9, 9 a, 10, 10 a, 6 .) 



Golofa imperialis, Thorns. Ann. Soc. Ent. Fr. 1858, Bull. p. cxlvi; Arcana Naturae, p. 10, t. 1. 



figs. 1,2 (c? ?)\ 

 Golofa Incas, Hope, Trans. Ent. Soc. Lond. ii. p. 43 ? 2 . 



Hab. Mexico 12 (Sturm, in coll. Salle), Capulalpam, Cuernavaca, Duraznal (SalU); 

 Guatemala (SalU). 



Evidently very closely allied to G. pizarro, but probably specifically distinct. It is 

 larger, and the largest examples of the male (46 millim.), which, judging from the 

 long cephalic horn, are of full development, have a thoracic horn with parallel sides 

 bent forward and pointed at the apex, and therefore different in shape from either the 

 major or the minor males of G. pizarro ; in the male minor the thoracic horn is reduced 

 to a thick and very obtuse tubercle. The surface is more finely punctured, and the 

 suture and lateral margins of the elytra are blacker, the thorax in some examples spotted 

 with black, and the humeral angles of the elytra and the scutellum also black. The 

 female is entirely black. In both sexes the apical edge of the mandibles is sometimes 

 faintly (in the female more sharply) notched towards the inner angle, a character which 

 distinguishes the species from G. pelagon and G. wgeon, in which the mandibles are 

 bifid. 



Hope's description of the male of his G. incas, especially with regard to the thoracic 

 horn, " thorax cornu erecto, brevi, apice acuto," scarcely applies to G. imperialis, and 

 that of the female is still less applicable. I have seen no Golofa, $ , from Mexico of the 

 colour he describes ; but the present species is named G. incas in the Salle collection. 



We figure a well-developed male from Mexico (coll. Sturm), and a male minor from 

 Duraznal and another from Guatemala. 



3. G-olofa costaricensis. (Tab. XX. figg. 11, 11 a, <s .) 



<$ . G. imperiali proxime affinis ; minor et angustior, elytris cinnamomeo-flavis (sutura leviter infuscata), subti- 

 lissime punctatis, sericeo-opacis, versus suturam subnitidis, tborace rufiore ; mandibulis apice latis juxta 

 angulum interiorem obtuse leviter incisis ; corpore subtus cum femoribus longe et dense Mvo-griseo 

 pubescenti. Tarsi antici articulo basali sequenti duplo longiore (nee sicut in G porteri longissimo). 



S (major?). Cornu capitis valde elpngatum, gracile, postice rugosum et dentatum ; cornu thoracis quam in 

 G. imperiali altius et gracilius,Versus apicem paullulum sensim dilatatum, apice antice curvatum obtusum 

 vel obtuse acuminatum. Tarsi 4 postici baud incrassati nee subtus dense pilosi. 



Long. 38-44 millim. 



