352 
BRAZILIAN ORTHOPTERA 
V-shaped trough on each side; cerci slender, subcompressed, 
when seen from the lateral aspect the proximal half is regularly 
tapering, the distal half bears a slight widening along the dorsal 
margin which tapers to the acute apex, when seen from the dorsum 
the cerci are parallel proximad, faintly incurved from the middle 
to the distal fourth, thence to the apex straight parallel; sub- 
genital plate moderately produced, subcompressed, apex rounded 
subrostrate, dorsal margin elongate and narrowly V-shaped, the 
same gently arcuate when seen from the lateral aspect. 
Dichroplus amoenus (StS,l) 
1878. P[ezotettix] (Dichroplus) amoenus StM, Bihang K. Svenska Vet.-Akad. 
Handl., v, no. 9, p. 8. [Peru.] 
Rio de Janeiro. April 9 to 11, 1913. (Malcolm Burr.) One 
female. 
Tijuca. April 9 to 11, 1913. (Malcolm Burr.) Two males, 
three females, one immature male. 
Petropolis. April 12 to 14, 1913. (Malcolm Burr.) Three 
males, eleven females. 
While a portion of this interesting series has been immersed in 
a liquid preservative for a short time, and its coloration is in 
consequence somewhat altered, we find positive evidence in the 
present material of the occurrence of two distinct color phases in 
the species. This condition occurs in a few other members of 
the Melanopli, such as Melanoplus herhaceus, but it is relatively 
uncommon in the Locustinae. The green phase is that described 
by Stal, with the base color of the caudal femora and cephalic 
and median limbs and abdomen clear oil green to oil yellow, the 
femora without transverse bars and the black of the distal ex- 
tremity strongly contrasted. The brown phase has the green 
replaced by rufous to ferruginous, the caudal femora with three 
distinct, transverse, greenish black bars on the dorsal surface, 
which fuse and color the greater portion of the lateral surface, 
while the distal extremity of the femora loses its contrasting 
coloration. The color of the caudal tibiae is changed but little, 
being but faintly darker in the brown individuals, which have 
the pale bars on the head and pronotum less strongly contrasted. 
All the decided brown specimens (two females) are from Petro- 
polis, but another female from the same locality and one of the 
same sex from Tijuca are nearly intermediate between the two 
phases, having the dorsal bars on the femora weakly but dis- 
