1917.] NATURAL SCIENCES OF PHILADELPHIA. 257 



C. Cerci broad throughout, distal portion narrower but not 

 slender. Pallium moderately produced. Subgenital plate 

 with a weakly suggested, blunt tubercle meso-distad at 

 the free margin. Size averaging smaller and color usually 



darker palmeri (Scudder). 



CC. Cerci broader, distal portion not as much narrower. Pal- 

 lium greatly produced. Subgenital plate with distal 

 portion evenly rounded. Size averaging larger and 

 coloration usually paler dumicola (Scudder). 



The females are less easily separated. Those of accola are dis- 

 tinctive in the pale dorsal surface of the pronotum; of arigiistipennis 

 by the small size, immaculate dorsum of pronotum and somewhat 

 maculate caudal femora; those of valga from the female allotype of 

 bistrigata only by their smaller size and less robust form. The 

 females of litus, palmeri and dumicola have the tegmina much broader 

 than in any of the other species. The female of litus is readily 

 separated by the distinctive coloration, which is similar to that of 

 the male. Those of palmeri and dumicola are separable only by 

 the usually different size and coloration as found in the males.^^ 



The species accola, palmeri and dumicola are found within the 

 United States and will be comprehensively treated in another study; 

 of these palmeri alone is known from Mexico, in which country the 

 type series was taken. 



Phaedrotettix gracilis (Bruner). 



1908. Cyclocercus gracilis Bruner, Biol. Cent.-Amer., Orth., II, p. 307. 

 [c?, Tampico, Tamaulipas, Mexico.] 



Tamos, Tamaulipas, XII, 7, 1909, (F. C. Bishopp), Icf, [Hebard Cln.]. 

 Pueblo Viejo, Vera Cruz, XII, 8, 1909, (F. C. Bishopp), Ic^, [U. S. N. M.]. 



The present species shows nearest relationship to P. bistrigata. 

 The males differ in the smaller size, lack of very decided dorso-lateral 

 cephalic and pronotal pale lines, only slightly enlarged apex of 

 abdomen, presence of small, bluntly triangular furcula and less 

 elongate but even more slender cerci. The general coloration would 

 appear to differ only in the decided dorso-lateral cephalic and pronotal 

 pale lines found in the male type of bistrigata; which specimen is, 

 however, in a poor state of color preservation, having been dried 

 after immersion in alcohol. 



The male from Tamos shows individual variation in having the 

 dark dorsal and dorso-lateral surfaces of the head and pronotum 

 solid, the ventral portion of the pronotal lateral lobes buffy white 



" The female of gracilis is unknown. 



