et bali sto a 
( 459 ) 
IV. On Chalcid Parasites bred from Pupae of Teratoneura 
isabellae. By JAMES WATERSTON, ED. Die: 
[In a letter of Oct. 18, 1917, Farquharson spoke of sending 
“two Teratoneura pupae from which Chalcids of two kinds 
emerged. I have more in reserve.” (See also his notes on 
pp. 346-47.) Of the pupae sent, one, A, had yielded, on 
March 5, 1917, 245 minute Chalcids; from the other, B, 
found Feb. 21, 1917, a single large female, identified by 
Dr. J. Waterston as Chalcis % leighi, emerged March 2. 
The material in reserve arrived later and consisted of 152 
minute Chalcids, which emerged Feb. 20, 1917, from a 
pupa, C, which was not received. These 152 examples 
were larger than those from pupa A, but considered by 
Dr. Waterston to belong to the same species Tetrastichus. 
balteatus. That the 245 should be smaller than the 152 
was to be expected, but that the proportion of males in 
the larger number should be so much higher (2 to 5 as 
against 2 to 17) suggests further inquiries which may lead 
to conclusions of much interest. Dr. Waterston has 
kindly written (Sept. 18, 1919, and Feb. 29, 1920) the 
following account.—E.B.P.] 
re Chalcids from TERATONEURA. 
There are in this material two species :— 
(a) Eulophidae—Genus Tetrastichus. 
Tetrastichus balteatus Waterst. (Bull. Ent. Res. VI, 
Pt. III, Dec. 1915, p. 241, figs. 4, 6). 
Of this species there are [altogether from pupae A 
and C] 86 ¢ and 311 Q (i.e. 21°66 % of the total—397) 
which agree well with the type material bred from the 
pupa of a Lymantriid moth, Port Herald, Nyasaland. 
There are some slight differences in the proportion of the 
funicular joints ($) which do not appear to be of specific 
value. 
I cannot discover that more than one species is repre- 
sented. The difference in size which struck you is partly 
sexual, the female being on the average considerably larger 
than the male, partly also I believe a matter of nutrition. 
Sorting the material roughly by size there are two lots of 
TRANS. ENT. SOC. LOND. 1921.—PARTS III, IV. (JAN. ’22) 
