32 TRAVELS AMONGST THE GREAT ANDES. 



66. Dyscinetus dvhius, Oliv., Eiit., i, 5, p. 32, t. 3, f. 20, «, b ; geminatus, Fdb., 



Syst. El., ii, 166 ; Burin., Handb., v, p. 78. 



Hah. La Mona (under 200 feet). Four examples. Widely distributed 

 in Equatorial America, throughout the Amazons plains, Cayenne, etc. 



Burmeister drew up his desciiption of D. geminatus evidently from South 

 Brazilian specimens, in which the pygidium is coarsely shagreened for a 

 greater or less extent at the l^ase in Ijoth sexes and sparsely punctured in the 

 rest of its extent. In the true Guiana form of the species, to which Olivier's 

 and probably Fabricius' specimens belonged, the pygidium in the male is 

 densely rugulose or vermiculate-punctate throughout, except for a small .space 

 on the disk, and in the female sparsely punctui'ed with the base r(jughened. 

 The S. Brazilian form is moi'e oblong (the elytia being scarcely dilated be- 

 hind), the S anterior claws and claw joint much thicker, and the clypeus 

 generally more coarsely punctured than in the Guiana type ; in tlie latter the 

 S pygidium is clothed with stiff haii's, the 9 naked and much more coni- 

 ];)ressed laterally. 



Ecuadorian examples are much more tinely punctured than those from 

 the Amazons. 



67. Stenocraies laborator, Fabr., Syst. Ent., i, p. 18. 



Hab. Guayaquil. Three example.^. Also Amazons plains and Surinam. 



68. S. holomelanus, Germar, Ins. Spec, nov., jx 116. 



Hab. Pacific slopes (below 1400 feet). Three examples. Found through- 

 out tropical South America. 



69. Megaceras Philoctetes, Oliv., Ent., i, 3, p. 16, t. 14, f. 125 : syn. M. Teucer, 



Burm., Handb., v, p. 223. 

 Hab. Nanegal (3-4000 feet). One female example, probably of this 

 species. 



Baryxenus, nov. gen. 



Ad Sect. Pimeloindes pertinet. Corpus oblongum, crassum, convexum. 

 Caput parvum ; clypeus triangularis ; frons ( $ ) tuberculo acuto armata. 

 Mandibulre breves, crassie, obtusfe extiis rotundata?. Maxillai subobtuste, 

 inermes, pilosoe. Mentum antice angustatum. Palpi articulo terminali oq- 

 teris conjunctis longiori subcylindrico. Antennfe articulis 3-5 brevibus 6-7 

 latae. Thorax antice parum retusu.s tulterculis duobus antico-discoidalibus. 

 Tibiae anticEe 4-dentat8e ; intermedite et posticaj intus planatae, extus uni- 

 carinatse apice oblique truncatfe, truncatur^e marginibus simplicibus ; calcaria 

 lata, obtusa : tarsi articulo l'"*^ obtuso triangulari. Prosternum lobo post- 

 roxali mnnituni. 



