1917.] NATURAL SCIENCES OF PHILADELPHIA. 261 



lettuce green proximad, becoming oil green; spines black tipped; 

 hairs white. 



The female is almost identically colored, the dorsal surface only 

 showing a stronger green suffusion, yellowish oil green on the 

 metazona. 



The species is known from a single pair. 



Sinaloa behrensii Scudder. 



1897. Sinaloa behrensii Scudder, Proc. U. S. Nat. Mus., XX, p. 31, PI. Ill, 

 fig. 7. [d', 9 ; Sinaloa, Mexico.] 



The type and allotype, belonging to the Museum of Comparative 

 Zoology, are before us. The genus shows a general resemblance to 

 Phcedrotettix. The species resembles P. gracilis in general color 

 pattern and P. accola in pronotal form and contour, but has the 

 tegmina of the broader type found in P. litus, -palmeri and dumicola. 

 The elongate, slender, parallel male furcula, with a node on the 

 dorsal surface of the subgenital plate on each side of these appendages 

 are distinctive features in the present genus. 



The specimens at hand are dried alcoholic but show the following 

 features of coloration. Dorsal surface of head and pronotum rather 

 pale, postocular dark stripe broad, less, distinct but percurrent on 

 the lateral lobes of the pronotum and continued on the tegmina, 

 suffusing their ventral portions and with proximo-lateral dark areas 

 on male abdomen which decrease in size caudad. Limbs pale, the 

 genicular areas of the caudal femora suffused, dark brown. 



Sinaloa nitida (Scudder). 



1897. Melanoplus nitidus Scudder, Proc. U. S. Nat. Mus., XX, p. 207, 

 PI. XIV, fig. 2. (In part.) [d^, Tepic, Mexico.] 



The type and an additional topotypic male, when compared with 

 the male type of Sinaloa behrensii now before us, show the unmis- 

 takable consanguinity of these very distinct and little known species. 

 The extraordinary male genitalia are very similar in the two species, 

 the only noteworthy difference being in the greater distal width of 

 the cerci in the genotype, behrensii. 



When compared, we find the male of nitida to be more robust in 

 structure, with pronotum shorter, prozona more convex, with trans- 

 verse sulci as decided but not cutting the weak median carina, which 

 is weakly convex in longitudinal outline and prozona laterad weakly 

 but distinctly and more evenljt concave in outline. In the present 

 insect the large shining black spot of the dorsal portion of the lateral 

 lobes of the pronotum, margined by a narrow buffy convex line above 

 and below, immaculate sides of the metazona and unicolorous tegmina 

 are distinctive features of coloration. 



