326 LAMELLICOBNIA. 



vel simplex ; thorace sicut in typo gibbere alto antice dentibus duobus subparallelis lateribusque a gibbere 

 usque ad angulos anticos et marginibus grosse strigosis. 

 § . Tborax dimidio anteriore et lateribus grosse, antice confluenter, punctatis, medio prope marginem anticum 



obsolete bitubereulatus. 

 Long. 32-45 millim. J $ . 



Examples of this variety are labelled in the Salle collection M. morpheus, Burm. ; but 

 they do not at all agree with that author's description, which refers to a species from 

 Colombia of narrow form, and especially narrow prothorax. Burmeister's descriptions 

 of the species of this genus are, besides, so incomplete, that no safe determination is 

 possible. 



The stridulating-strise of the propygiclium are beautifully perfect on two divergent 

 ribs which cross the middle of the segment ; on the rest of the surface they are coarser 

 and interrupted. In a highly-developed male example from Costa Rica the thorax is 

 longer than in the others, and is gradually narrowed in an incurved line from the 

 median dilatation to the anterior angles. M. philoctetes was found in the greatest 

 profusion in the water and along the banks of a lagoon in the dense forest on the slope 

 of the Volcan de Chiriqui at an elevation of 4000 feet {Champion). A well-developed 

 male from Bugaba is shown on our Plate. 



CCELOSIS. 



Coslosis, Hope, Col. Man. i. p. 88, t. 2. fig;. 6 (1837); Burmeister, Handb. der Ent. p. 215; 

 Lacordaire, Gen. Col. iii. p. 436. 



Three or four species are all that are at present known of this peculiar genus, one 

 extending to Mexico and the others restricted to Tropical South America. 



l. Coelosis biloba. 



ScarabcBus bilobus, Linn. Syst. Nat. i. 2, p. 544; Eabr. Syst. Ent. p. 6; Oliv. Ent. i. 3, p. 31, t. 5. 



fig. 35 ( ? ), t. 23. fig. 35 (<?), t. 1. fig. 5 (J minor) \ 

 Coelosis biloba, Burm. Handb. der Ent. v. p. 217 2 . 



Hdb. Mexico, Cordova, Toxpam {Salle, Hoge) ; British Honduras, Cayo {Blanca- 

 neaux); Guatemala, Cubilguitz {Champion), Coban {Conradt); Hondueas, "Ruatan I. 

 {Gaumer) ; Nicaeagua, Chontales {Belt, Janson); Costa Eica {Van Patten) ; Panama, 

 Bugaba, Volcan de Chiriqui, David, Tole {Champion). — South Ameeica, Cayenne 1 2 ; 

 West Indies 1 . 



Mexican examples figure in collections under the catalogue-name of var. nicon 

 (Chevr.), but they offer no character to distinguish them from the Panama and South- 

 American form. 



