92 NORTH AMERICAN ACRIDIDAE (oRTHOPTERA) 



1907. Achurum acridodes Rehn, Proc. Acad. Nat. Sci. Phila., 1907, pp. 31 

 and 69. [cf, 9; Carr Canyon, Huachuca Mountains; Palmerlee, and 

 Baboquivari Mountains, Arizona.] 



1907. Achurum. acridodes Snow, Trans. Kansas Acad. Sci., xx, part ii, 

 p. 36. [Baboquivari Mountains, Arizona.] 



The type of this species is probably in the Geneva Museum. 



The sides of the vertex normally show weak convergence. In 

 rare examples, however, they are parallel to the rounded apex, 

 as is normal in Radinotatum. The disk of the pronofum toward 

 the cephalic margin and the entire metazonal portion is minutely 

 impresso-punctate, individually varying through all stages to 

 minutely and longitudinally rugulose. This variation and the 

 sexual difference (the male being smaller and distinctly more 

 slender) led Stal to describe, as acridodes, a male showing the 

 impresso-punctulate type. The validity of that name has 

 constantly been questioned and the material now l^efore us 

 satisfactorily proves the synonymy indicated above.'' Those 

 individuals having the pronotal disk brown appear to be more 

 liable to have it more generally roughened with rugae more 

 decided. The genicular lobes of the caudal femora vary slightly 

 in length and slenderness, but this does not ap])ear to be suf- 

 ficiently decided or stable to warrant racial or other nominal 

 recognition. The number of dorso-external spines of the caudal 

 tibiae varies from thirteen to seventeen, the average being fif- 

 teen. 



In the half-grown and larger innnatures of this species the 

 supra-anal plate is short and truncate, but beyond it projects, 

 as a slenderly conical process, an elongate terminal segment 

 (plate IV, figure 4). This process is similar in the series, longer 

 than the pronotum, straight, with dorsal surface concave between 



^ The following Mexican material i.s before us. 



Cluadalajara, Jalisco, (D. L. Crawford), cf , 7 9 ; VIII, 20 and IX, IS, 

 1903, (J. F. McClendon), 2 9, [all A. N. S. P.]. 



Vera Cruz, (A. Salle), 1 cf , [Hebard Cln.]. 



Orizaba, Vera Cruz, I, 1892, (L. Bruner), 2 juv. d", 1 juv. 9 , [Ilebard Cln.]. 



Cuernavaca, Morelos, (D. L. Crawford), 1 cf , 1 9 ; I, 4, 1899, (L. Bruner), 

 1 juv. cf , [all Hebard Cln.]. 



Chilpancingo, Guerrero, 4G00 feet, VI and VIII, (11. 11. Smitli), 1 a", 1 9, 

 [Hebard Cln.] 



Toriala, Chiapas, VIII, 7, 1909, (A. Petrunkevitch;hill about 1000 iwi liisli), 

 1 9, [A. M. N. II.]. 



I 



