ee 
T. BAINBRIGGE FLETCHER 103 
widens and suddenly develops mto a large whitish blotch. Wherever the 
mine may be started, the larva always works towards the apex of the leaf 
and hence the expanded portion of the mine always lies towards the apex. 
The narrowed portion of the blotch is filled with brown frass. 
The full-grown larva is about 7 mm. long and about 1 mm. across the 
prothorax and metathorax, which are the broadest segments, tapering pos- 
teriorly, flattened, segments well-defined and somewhat protuberant laterally, 
uniform pale yellow. Head flattened, much smaller than prothorax (into 
which it is partly retractile), brown. Prothoracic shield pale yellow. Spiracles 
form short minute protuberant tubes. Five pairs of short prolegs. 
When full-grown, the larva severs the margins of the broadened portion 
of its mine and rolls one layer longitudinally mwards and pupates inside 
the roll so formed. 
The larve are extensively parasitized, and less than half the number 
of larve collected emerged as moths. Larve collected on 2bst September 
-1916 emerged between 11th October and 2nd November 1916, and others 
collected on 3rd January 1916 emerged between 5th March and 14th April 
1916. (Pusa Insectary Cage-slips 1343, 1470.) 
COSMOPTERYX PHAHOGASTRA, MEYR. (PLATE XXIII, FIG. 2.) C 
Cosmopteryx phcogastra, Meyr., Ent. Mo. Mag., LILI, 257-258 (Nov. I917)() ; Pe. 
Fletcher, Ann. Rept. Impl. Entom., 1917-18, p. 101 (1918)(2), ure. H Eu. treet Ben 
“Pusa; bred in July from larve mining blotches in leaves of bean (Nw. ae 
(Fletcher).” 
Larvee were found at Pusa on 22nd November 1916 mining bean leaves, 
between whose epidermal layers the larva forms a cylindrical silken case 
which is always placed alongside a leaf-vein. The case is about 10 mm. 
long, narrowed towards one end and expanded towards the other, and inside 
it the larva lives, emerging or at least thrusting its anterior extremity out 
from the broader end of the case and mining the leaf, feeding only at night. 
The narrower end of the larval case is open and the black larval frass is 
extruded through it. Usually several larve, up to twenty or even more, are 
found on one leaf, and occasionally two cases are joined together side by side. 
The larva is about 6 mm. long and about 1 mm. broad across the middle 
of the body, rather stout, flattened, tapering slightly anteriorly and more pro- 
minently posteriorly, segments distinct, uniform pale yellow; head shiny, 
dark brown, narrower than prothorax into which it is slightly retractile, lobes 
prominent posteriorly ; prothoracic shield yellow-brown, divided medially ; 
anal segment with a brownish shield ; five pairs of small prolegs. 
8 
