302 PROCEEDINGS OF THE ACADEMY OF [May, 



in the north not large or robust (scudderianus, 45), but in Florida 

 larger and more robust (firmus, 2 weal-dy 0). It is an adaptation 

 to arenaceous surroundings in these regions. Immature individuals 

 could easily be confused with those of Miogryllus verticalis,^^ but in 

 that species the young are more regularly marked with darker colors 

 and normally have 5 spines on each dorsal margin of the caudal 

 femora. Other names: ruhens, jirmus, arenaceus. 



AU, (normally ax) 4. negledus Sc udder. 



This is the darkest variant found in the present species, the maxi- 

 mum development of the condition found also in the two following 

 variants. It is found in the northeastern portion of the insect's 

 distribution, ranging southward in the high Appalachians to northern 

 Georgia and is known from the Piedmont Plateau only in Pennsyl- 

 vania. Much variability exists and every intergradation with the 

 next two variants is often to be found in the same series. 



AV, (normally a or b but ranging to f, x but often u), 3. pennsyl- 

 vanicus Burmeister. 



This is the dominant variant of the species in the well watered 

 regions of temperate North America and is found southward to the 

 Gulf coast of eastern Texas. Great variability is exhibited and 

 every intergradation with the variants termed negledus and luctuosus 

 is to be found. Other names: nigra, angustus. 



AW, (normally d but ranging from a to f, w but often u), 3. luc- 

 tuosus Serville." 



This variant shows an intensification of the features of the last. 

 It is found throughout the lowlands of the southeastern United States 

 and in the Middle West from Manitoba southward to the arid regiong. 

 It also exhibits great variability. The maximum of this condition 

 is found in material from the pine woods of the southeastern United 

 States. Other names: abbreviatus. 



AXW, (normally a, u but often w), 3. integer Scudder. 



This is an adaptation found in the mountains of the arid portions 

 of the southwestern United States and also in California. Extreme 

 variability is to be found. Other name: vocalis. 



Our series are not sufficiently numerous from temperate South 

 America to show as definitely the variants there developed; quite as 

 many probably exist as found in North America. Of these fulvi- 



" Under this name of Serville's will be found both laplatm Saussure and saussurei 

 Scudder. See Hebard, Jour. N. Y. Ent. Soc, XXIII. . (1915.) 



" This is the variant which the authors have previously consistently recorded 

 as ruhens from the southeastern United States. 



