184 DERMAPTERA AND ORTHOPTERA FROM SINALOA, MEXICO 



sulcus and a smaller similar marking in the area of the femoral 

 brush. The great variation exhibited in these features shows 

 the folly of attempting to separate as species,, individuals of the 

 Mantidae differing only in such, or analogous, color characters. 

 Though previously known only from the originally described 

 material, there are, in addition, in the author's collection a male 

 from Aguascalientes, taken in November, 1887, by L. Bruner, 

 and two females, one from Rio Cocula, Guerrero, the other 

 from Tepic. This male has the eyes slightly more acute, with 

 their dorsal margins slightly ascending, so that the head does 

 not appear as nearly transverse dorsad as in the Sinaloa series. 

 This we beheve to be wholly attributable to individual variation, 

 though large series may prove geographic racial differentiation. 



OLIGONICINAE 

 Oligonicella mexicana (Saussure and Zehntner) 



1894. Oligonyx mexicanus Saussure and Zehntner, Biol. Cent.-.\nier., Orth., 

 I, p. 172, pi. IX, figs. 13 to 15. [o^: Presidio [of Mazatlan, Sinaloa], Mexico; 

 Cubulco, Vera Paz, Guatemala.] 



1894. Oligonyx toltecus Saussure and Zehntner, Biol. Cent.-Ainer., Orth., i. 

 p. 175. [ 9 ; Chilpancingo, Guerrero, Mexico.] 



At the time toltecus was descril)ed, the authors noted the 

 possibility of its representing the opposite sex of mexicanus. ^'^ 



Venvidio, VI, 16 to IX, 2, 1918, 14 cf, 1 9. Los Mochis, 

 XII, 1917 and I, 1 to 2, 1918, 3 c^. 



A pair of this species from Tepic is also in the collection of 

 the author. 



The measurements of the extre.mes in the present series are: 

 length of body, d^ 37 to 42.7, 9 '** 37.2 to 44.8; length of pronotum, 

 cf 9 to 10.7, 9 11.3 to 14; greatest width of pronotum, d" 1.9 

 to 2, 9 2.2 to 2.4; length of tegmen, d 20 to 22; length of 

 supra-anal plate, cf 1.7 to 1.7, 9 2.1 to 2.2; length of cephalic 

 femur, d 6.4 to 7.8, 9 8.1 to 9.3 mm. 



^' Saussure and Zehntner give 3.2 mm. as the length of the supra-anal 

 plate for toltecus. This is either in error or very deci(l(Ml individual variation 

 occurs, as wo have found (o he (rue of feiiKiles of ccrtniii oilier species of (his 

 groui). 



•*•* 'I'he largei' female is fioin \'ciividio. 



