SCHISTOCERCA, SPHINGONOTUS AND HALMENUS 433 



amongst themselves. In general they are of a conspicuously grayer 

 coloration than any of the S. me/anocera forms and this character is 

 especially noticeable when they are observed flying in the field, being 

 conspicuous mainly on account of the paler colored tegmina and the 

 almost uncolored posterior wings. One specimen, the least typical of 

 the lot, is almost an exact duplicate of any typical Charles Island 

 specimen, differing from the Charles /jpe figured merely in having the 

 median red dorsal area of the hind femora almost fused with the 

 lower yellow line, and in having the third dorsal spot present on the 

 femur. Also there is a row of small spots along both sides of the 

 upper end of the tibia. These characters, however, are possessed by 

 many of the Charles specimens. On the head the yellow bands before 

 and behind the eye are fused along the lower part of the gena, but one 

 Charles specimen duplicates this character. The distal part of the 

 tegmina in some of the Duncan specimens, has exactly the same shade 

 as in the Charles specimens and entirely lacks maculations. The 

 average size of all the specimens from Charles and of all from Duncan 

 is practically the same. On the other hand, specimens at the opposite 

 end of the series are indistinguishable in color from Hood Island 

 specimens. One specimen, in fact, resembles the typical Hood Island 

 specimens even more closely than the one just described resembles the 

 Charles iype. On the lateral angle of the prozona is a pale yellowish 

 band extending the whole length of the prozona, above it is faintly and 

 narrowly bordered with black (the median dorsal part of the prozona 

 being reddish-brown), below it is an indistinct band of equal width of 

 punctate black, below this again is an indistinct band of yellow and 

 from this to the lower border of the prozona the color is yellowish, 

 finely spotted with black. This is exactly the same pattern as is present 

 on the Hood Island specimens. Large and small black markings are 

 present on the hind femora exactly the same as on Hood specimens, 

 and the left tibia is spotted above on the outer side. The head is al- 

 most uniform yellowish-brown with faint black post-ocular bands. 

 The antennas are pale reddish-brown basally but dusky beyond. The 

 abdomen is plain brown. 



In general the specimens show a strong tendency toward a uni- 

 formity of coloration ; the yellow markings of the head are in most 

 cases fused across the separating black spaces so as to almost obliterate 

 the latter. The metazona in most cases is not nearly so distinctly dif- 

 ferentiated from the prozona in color as in the melanocera forms, the 

 uniformity being due to a diffusion of the dark color of the prozona 

 into the yellow of the metazona. As shown in the drawing of the type 



