126 PROCEEDING'S OF THE ACADEMY OF [Feb., 



the Rio Grande, while seven in various stages of growth were taken at 

 Deming on July 18 on the rabbit weed and mesquite flat, and a single 

 immature specimen was taken on the lower slopes of the Florida 

 Mountains, July 19. 



A bleached female specimen from Pecos, Texas, in the collection of 

 the Academy belongs to this species. It has been immersed in liquid 

 preservative at some time and in consequence is somewhat shrivelled, 

 but the character of the head and the apex of the abdomen show it 

 to be mesillana. 



The range of the species now extends from Reeves County, Texas, 

 to Luna County, New Mexico. 



CERATITES 5 n. subgenus. 



Closely related to true Diapheromera, but differing in the presence of 

 a pair of horns on the head in both sexes, 6 and in the peculiar recurved 

 and inflated margin of the subgenital opercule in the male. 



Type. — Diapheromera (Ceratites) covillece n. sp. 



This subgenus includes four and probably five species: the type 

 species, tamaulipensis Rehn from Tamaulipas, Mexico, and beckeri and 

 bidens Kaup 7 from Mexico, while saussurii Kirby 8 from Dominica 

 probably belongs in this group, although rather anomalous in the 

 uninflated median femora. 



Diapheromera (Ceratites) covilleae n. sp. 



Types: cT and 9 ; Franklin Mountains, altitude 4,500 feet, near 

 El Paso, El Paso County, Texas. July 9, 1907. On greasewood (Covil- 

 lea tridentata) . (Hebard and Rehn.) [Hebard Collection.] 



Compared with D. beckeri and bidens Kaup, its nearest allies, the 

 new species differs from the former in the head being longer than the 

 pronotum, in the distinctly larger size and in the unarmed ventral mar- 

 gins of the cephalic limbs; from bidens it differs in the distinctly larger 

 size, more distant horns and in the absence of granules from the head 

 and thoracic segments. The cerci and eighth and ninth dorsal abdomi- 



6 KepaTiTijg, one that has horns. 



6 Horns are absent from the head of a male of a new species from Mexico 

 (tamaulipensis Rehn), but the female of that species possesses such well-marked 

 cephalic appendages that we feel justified in considering their absence in the 

 male as purely accidental. 



7 Berlin. Ent. Zeitschrift, XV, pp. 27, 28, 1871. 



8 Ann. Mag. Nat. Hist., (6). Ill, p. 501, 1889. 



