19 
PART I 
AGRIONINAE (Calopterygfinae, De Selys) 
LEGION AGRION 
1. Echo (Cl imaco basis) modesta, Laidlaw 
$ Climacobasis lugens, Laidlaw^ P.Z.S. 1902 (i) p. 85, pi. vi, fig. 5. 
$ Echo modesta, ibid, loc, cit. p. 84, pi. v, fig. 6. 
A fine series of 5 ^ and 2 9 from Bukit Besar, Nawngchik, from an altitude of 2,500-3,000 feet. 
There can be no doubt that the two species which I founded on a single 
specimen in each case, are merely male and female of the same species. The 
generic name may be retained as that of a section of the genus Echo^ distin- 
guished by the great relative length of the pterostigma in the male, in which 
it is about three times as long as in the female. This character serves to 
separate this species from the two or three species of Echo already known in 
which the pterostigma of the male is described as being short, or at most, only 
very slightly longer than in the female. 
On the other hand, it is readily distinguishable from the remarkable 
Archineura, which it resembles in the length of the pterostigma by its smaller 
size and less complex neuration. 
I have already described the characters of the female from a somewhat 
immature specimen. The mature female differs in having the pterostigma 
dark brown. 
As to the male, the curious white pruinose mark on the top of the head 
is only present in fully mature specimens. The wings are shorter and narrower 
than in the female, and the abdomen is slenderer, the ninth segment is only 
one-half the length of the eighth. 
The upper pair of appendages are one-third as long again as the lower 
pair, and about as long as the ninth segment. 
The pterostigma in the adult male is black. In young males it is whitish 
brown. 
The following is the literature dealing with this and allied genera : — 
Selys. Synopsis des Calopterygines 
Monographic des Calopteryginesy 1854 
{Echo margarita 9 described) 
Bull. Acad. Belg. (2) xlvii, p. 356 (1879) 
9/9/oj 
