SCHISTOCERCA, SPHINGONOTUS AND HALMENUS 427 



Length of prozona : 7, 6.5, 6, 7.5, 6.5, 6.5, 6.5, 6.5, 6,6, 6 = 

 6.4 half mm. 



Length of metazona : 8, 7.5, 7, 7.5, 7, 6.5, 6.5, 7, 6, 5.5, 7 = 

 6.8 half mm. 



Prozona : metazona = .94. 



SCHISTOCERCA LITEROSA HYALINA Scudder. 



Schistocerca literosa hyalina Scudder, Bull. AIus. Comp. Zool., Vol. xxv, p. 

 16, 1893. (Tower Island.) 



From Tower Island. 



Description of a Typical Specimen. Female. — Differs from the 

 specimen described from Chatham as follows : black below q^-e extend- 

 ing farther ventrad, defining more distinctly the yellowish color of pos- 

 terior part of genae ; a small black area just above base of mandible ; 

 punctations along each side of median line of head fused into two 

 bands leaving a longitudinal median yellow stripe well defined between 

 them ; post-ocular stripe present, less conspicuous and very indistinctly 

 divided by lighter color. Lateral stripes on prozona exactly as on the 

 Chatham specimen ; a faint indication of a median dorsal stripe on 

 prozona ; punctations of meso- and metathorax and of first and second 

 pairs of legs fewer ; small spots along upper outer carina of hind 

 femur absent, those of lower carina present but much smaller ; large 

 black dorsal areas of posterior femur much more distinct and better 

 defined, a third one indistinctly present in front of the first one of the 

 Chatham specimens ; maculations of tegmina fewer and fainter espe- 

 cially distally, only one spot on each side on the premedian area ; 

 reticulations of tegmina all pale gi"ay, except on dorsal surface of 

 closed tegmina where they are brown ; veins reddish basally, brown 

 mesially, gray terminally. 



Variations (14 specimens). — The Tower Island specimens differ 

 from those of Hood and Chatham in being of a conspicuously paler 

 coloration, due mostly to the paler reticulations of the tegmina. The 

 pattern of the coloration agrees more closely with that of the Hood 

 specimens than with that of the Chatham specimens. The black 

 bands inclosing a yellow one along the upper parts of the lateral pro- 

 zonal lobes are well marked but average a little paler than on the 

 Chatham Island specimens. The post-ocular stripe is present on the 

 head in all. In respect to the intensity of the lateral prozonal stripe 

 the Tower specimens are intermediate between those of Chatham and 

 those of Hood. Below the lower black stripe the color is uniform 

 dull yellowish-brown. The median dorsal prothoracic stripe is obso- 



