442 SNODGRASS 



dusky, below pallid mottled with gray, black and rusty. Tegmina 

 with the horizontal and sloping surfaces strongly differentiated and 

 contrasted in color, the former pale brownish-clay-color with a small 

 median basal area dark brown, the latter strongly infuscated, anteriorly 

 the color specially condensed into two, large, dusky, brown spots 

 reaching from the lower margin of the wing to the upper margin of 

 the lateral sloping surface, excluded abruptly from the horizontal 

 dorsal surface ; posterior part of tegmina pale, immaculate ; veins and 

 reticulations dark brown. Length of tegmina 19 mm. 



Variations (14 specimens). — In color these specimens are in some 

 respects an intensified form of the Albemarle race. The slaty color 

 of the gen£e strongly characterizes all but four specially reddish speci- 

 mens. There is a horizontal post-ocular stripe reaching from the eye 

 to the prozona and two prozonal stripes present in all, although they 

 vary considerably in intensity on different individuals. The metazona 

 varies from light yellowish-brown to reddish-brown. The prozonal 

 bands are sometimes continuous upon the inetazona and sometimes not. 

 Whatever the color of the dorsal surface of the metazona is, the pro- 

 zona is generally lighter in color and uniform with the head. There 

 is almost no variation in the color of the metathoracic femora, the large 

 black spots are generally well indicated, resembling those of the Albe- 

 marle form but are either discontinuous or but faintly indicated across 

 the dorsal edge of each femur. The basal and middle blotches on the 

 tegmina are in no case present on the upper horizontal surface of the 

 closed wings. The plain pale color of this area contrasts strongly with 

 the lateral surfaces, forming the most conspicuous character of the 

 species, and one by which it is easily distinguishable in the field from 

 the other species of the genus on the same island, with which it asso- 

 ciates, viz., S. tetranesiotis indefatigabilensis. 



The nymphs have the markings of head and thorax that are charac- 

 teristic of the adults, the slaty genae being prominent. 



Length of tegmina of juale, 14, 13, 13, 15 = 14 mm. ; of female, 

 18, 19, 20, 19.5, 20, 18.5, 20, 20, 19.5, 18.5 = 19 mm. 



This form is evidently more closely related to the Albemarle race 

 than to either the Charles race or the other Indefatigable race. Al- 

 though it differs from Sphingonotus trtnesiotis albemarlettsis in be- 

 ing somewhat larger, yet it resembles it and no other in the slaty color 

 of the genae, and the Albemarle race has faint indications of all the 

 markings of the head and thorax of 6". trtnesiotis indefatigabilensis. 

 The latter however differs distinctly from the former in the coloration 

 of the tegmina. 



