JAMES A. G. REHN 329 



ACRIDIDAE 



Diedronotus centralis new species (PI. XVIII, figs. 7 and 8.) 



Closely related to D. angulatus and mexicanus, agreeing with 

 these in the general form and height of the pronotum, but differ- 

 ing from the former in the proportionately more elongate pro- 

 notum, which has the lateral angles of the disk less produced, in 

 the angle of the caudal margin of the disk being less decidedly 

 produced, in the higher median pronotal carina, in the broader, 

 nearly sub-rectangular fastigium (when seen from the dorsum), in 

 the more rounded fastigio-facial angle, in the hardly sulcate frontal 

 costa, in the less elongate and blunter tegmina and wings, and 

 in its larger size. From mexicanus, with the allotype of which it 

 has been compared, the new species differs in the pronotum being 

 more longitudinal with the lateral angles of the disk less angulate 

 and more rounded, in the median carina of the same slightly 

 lower but of the same general type, in the head being broader, in 

 the fastigium having its dorsal form more nearly rectangulate, in 

 the head as a whole being broader, in the frontal costa being but 

 faintly sulcate, in the eyes more reniform-ovate in basal outline, 

 in the much more rounded fastigio-facial angle, in the more 

 inflated proximal portion of the caudal femora and in the larger 

 size. 



The species is quite distinct from D. discoideus and rosulejitus, 

 both of which, while related, can be readily distinguished from 

 centralis by their much more elongate pronotum and the very 

 distinctly lower median carina of the same. 



Ttj'pe. — 9 ; El Pelon, Guanacaste, Costa Rica. January, 

 1915. (P. Biolley.) [Academy of Natural Sciences of Phila- 

 delphia, Type no. 5354.] 



Size large: form subc()mi)res.seil : surface in general weakly cribroso-iJiuictu- 

 late. 



Head with occiput vaulted, descending cephalad to the weakly declivent 

 fastigium, width between the eyes equal to three-fourths of the depth of the eye; 

 fastigium when seen from the dorsum slightly acute-angulate, surface iion- 

 excavate; when seen from the side the fastigio-facial angle is rounded rect- 

 angulate; frontal costa relatively narrow dorsad, moderatclj' expanding to 

 between the antennae, sul)equal thence to immediately vcntrad of the ocellus, 

 weakly indicated from that point to the clypeal suture, the margins there 

 hardly indicated, surface of costa very faintly sulcate for a short ilistance 

 ventrad and dorsad of the ocellus; supplementary facial carinae rather deli- 

 cately indicated, diverging ventrad: eyes but little prominent when seen from 



TRANS. AM. ENT. SOC, XLIV. 



