406 
ON THE OCCURRENCE OE A CEPHALINE 
GREGARINE, LEI DY AN A TIN El n. sp., IN 
LEPIHOPTEROUS LARVAE. 
By D. KEILIN, Sc.D., 
University Assistant to the Quick Professor. 
(From the Quick Laboratory, University of Cambridge.) 
(With 1 Text-figure and Plate IX.) 
The gregarine herein described lives in the larvae of the moth 
Endrosis fenestreUa Stain, which I found in the nests of the house- 
martin (Chelidon urhica Linn.)^. 
The gregarines are usually present in almost all the moth larvae 
and they are always located in the mid-gut, being there mixed with 
the particles of feathers, chitinous remains of other tineid larvae and 
grains of sand. These latter make the preparation of sections very 
difficult and I had to study the gregarine chiefly on living specimens or 
in stained smears. 
A larva of E. fenestreUa Stain, often contains a great number of 
parasites in different stages of their life-cycle (Text-fig. 1). In habit this 
gregarine is always solitary. It moves very slowly; its body is easily 
curved and frequently shows transverse folds (Plate IX, figs. 8, 9, 10). 
The youngest stages of the parasite which were found are the small 
trophozoites about 30/x long and lOp, wide; these had their epinierit 
buried in the epithelial cell of the host (Plate IX, figs. 1, 2). At this 
stage the boundary between the protomerit and deutomerit is not yet 
^ The larvae of some other moths (Oecophora pseudospretella Stain, and Tinea palle- 
sceniella Stain.) found in the nests of Fringilla coelebs L. and Parus ater L. and Hirundo 
rusiica L. (Cambridge and Tonbridge) also contained some gregarines very similar to that 
here described, but I could not discover their complete life-cycles nor find their cysts. 
It is therefore impossible to identify these gregarines. 
I am very much indebted to Lieut. P. A. Buxton and Mrs P. A. Buxton for kindly 
sending me from Tonbridge the nests of different birds with valuable information about 
them. The material collected from these nests will be utilised for further work. 
