96 Journal New York Entomological Society. [Voi. xxiii. 



Melanoplus pygmaeus new species. 



Related to M. rotundipennis but differing in the distinctly broader 

 and more truncate prosternal spine in both sexes, which is broader 

 than long, and in the distinctive male genitalia. 



Type: Male; De Funiak Springs, Florida. October 17-19, 1914* 

 (Mutchler and Watson.) [American Museum of Natural History 

 Collection.] 



Size a little smaller than usual in rotundipennis and form slightly more 

 slender, with dorsum of pronotum having the lateral carinas more diverging 

 toward the posterior margin than in that species. Head with eyes less pro- 

 tuberant than in rotundipennis and with frontal costa distinctly sulcate 

 throughout. Tegmina much as in that species and separated by a width of 

 1.2 mm. Extremety of abdomen similarly little produced but with apex of 

 similarly proportioned subgenital plate produced in a brief rounded knob ; 

 supra-anal plate very simple as in rotundipennis but more elongate, distinctly 

 longer than broad, furcula absent; cerci of the rotundipennis type (see figure) 

 but with a greater curve of the shaft beyond the middle and with the apex 

 distinctly larger and more evenly rounded. The soft integument between the 

 supra-anal and subgenital plates does not rise above the dorsal margin of the 

 subgenital plate. 



Allotype : female ; bears the same date as the type. 



This sex may be separated from females of rotundipennis by the char- 

 acters of the prosternal spine and lateral carinae of the dorsum of the 

 pronotum. The general coloration and coloration of the caudal tibiae may 

 also serve to distinguish this sex, which is very similar to females of 

 rotundipennis in size, form and general superficial appearance. 



Measurements (in millimeters). 



Male Type. Female Allotype. 



Length of body 14. 23. 



Length of pronotum 3.3 4.8 



Length of tegmen 2.8 4. 



Greatest width of tegmen , 1.8 2.6 



Length of caudal femur 9.7 12.7 



Greatest width of same 2.3 3.2 



In coloration the specimens resemble less heavily marked speci- 

 mens of rotundipennis with caudal femora nearly immaculate above 

 and pale yellow in the male and weakly orange in the female beneath. 

 The caudal tibiae are very pale bluish with a slight purple suffusion. 

 In the male the eyes and antennae are distinctly reddish. The lateral 

 lobes of the pronotum are almost immaculate in the female. 



