LIBOMETOPUM.— EXOCEPHALA. 381 



Pronotum supra latum, subconvexum, ruguloso-punctatum, postice leviter productum, arcuato-truneatum. 

 Lobi laterales densissime rugati, angulo infero leviter producto, rotundato. Elytra abdomen vix vel 

 parum superantia, ovato-lanceolata, apicem versus attenuata, densissime punctato-reticulata, coriacea ; 

 campo marginali multifarie reticulata, areolis punctiformibus, pellucidis vel nigris, venis retis itaque 

 nigro-circumdatis. Venae transversse areae ulnaris ad marginem posticum puncto nigro. Alse byalinae. 

 Femora anteriora margine antico spinis 4 ; intermedia 5 ; postica 10-12. Segmentum anale supra 

 medio leviter incisum. Lamina supra-analis trigonalis. Ovipositor rectus, femore postieo plusquam 

 sesqui-longior, apice acuto. 



$ . Long. 35 ; lat. capitis 11*5 ; pronot. 13 ; elytr. 34, lat. 12 ; femor. post. 17 ; ovipos. 25 millim. 



<3 . Long. 41 ; pronot. 13*5, lat. 12*5 ; elytr. 37 ; femor. post. 20 ; ovipos. 25 millim. 



Hab. Nicaragua, Greytown ; Costa Kica, Cache (Rogers). — Colombia (Mus. 



Genavense). 



This insect has a most extraordinary appearance on account of its enormous, flattened 

 head. The elytra are very closely reticulated, so that the small transparent cells are 

 punctiform ; but seen by reflected light, at least in the marginal field, the cells appear 

 to be black, the veins forming the wider net of the reticulation looking as if they 

 were margined with small black spots. This last-mentioned character is not apparent 

 in discoloured specimens. 



EXOCEPHALA, Serv. 



Exocephala, Serville, Hist. Nat. des Ins. Orthopt. p. 507 (1839) ; Burnieister, Handb. der Ent. ii. 



p. 723 (1839) j Blanchard, Hist. Nat. des Ins. iii. p. 26 (1840) ; Redtenbacher, Monogr. der 



Conoceph. p. 31. 

 Moncheca, Walker, Cat. Derm. Salt. ii. p. 289 (1860). 

 Vestria, Stal, Recens. Orthopt. 2, pp. 97, 105 (1874). 

 Marium tympanum in utroque elytro membranaceum. 



Synopsis specierum. 



a. Verticis rostrum primum articulum antennarum vix superans, obtusum. 

 b. Ovipositor rectus. — 1. bisulca, Serv. 

 bb. Ovipositor curvatus. — [nigricauda and viridis, Burm. (North Amer.).] 

 aa. Verticis rostrum primum articulum antennarum superans, apice coarctatum, acuminatum. 



b. Verticis rostrum primum articulum antennarum haud duplo superans. — [2. spinifrons, 

 sp. n.] 

 bb. Verticis rostrum primum articulum antennarum duplo superans. — 3. punctata, Redf. 



1. Exocephala bisulca, Serv. 



Locusta bisulca, Serv. Encycl. Meth. x. p. 342 (1825) ; Rev. Meth. p. 160. 



Exocephala bisulca, Serv. Hist. Nat. des Ins. Orthopt. p. 508; Redt. Monogr. der Conoceph. p. 32, 



t. 3. fig. 7. 

 Moncheca pretiosa, Walk. Cat. Derm. Sak. ii. p. 289. 

 Versicolor. Caput fulvum vel rufescens ; facie antrorsum nigra, ore nonnunquam rufo. Verticis rostrum breve, 



obtusum, ad apicem tuberculo utrinque minuto. Antennae frequenter nigrae, longe flavido-annulatae. 



Pronotum fusco-rufum vel nigrum ; lobis lateralibus margine luteo cum vitta metazonae et cum vitta 



