218 Lambornella stegomyiae 
other is free from infection. As will he seen later, this larva yielded Lambornella 
cysts. 
Larva No. 4. Contains few parasites; labelled by Lamborn “early infesta¬ 
tion with protozoal parasites.” 
Larva No. 5. Found dead, with only one gill remaining; few parasites 
scattered throughout the body-cavity. 
Fig. 1. Larva of Stegomyia scutellaris Walker, posterior end of the body, siphon and gills showing 
by transparency a very great number of parasitic ciliates (Lambornella stegomyiae). The 
contours of the larva are represented schematically, all the accessory organs and sensory 
hairs being omitted. 
In the living state, the body of Lambornella stegomyiae is described by 
Lamborn (1921, p. 213) as being pear-shaped; in a few cases specimens 
fixed in formalin still retain this shape, but, more often they are elongatelv 
oval, ranging in length from 50 fa to 70 g, with a maximum diameter of 20/x 
to 30/z. The body surface is uniformly covered with cilia, densely disposed, 
and arranged in longitudinal parallel rows. The ectoplasmic layer is not clearly 
defined; the endoplasm is very granular. The macronucleus (Figs. 2 and 3, M.) 
is spherical, from 10/x to 13/x in diameter, stains deeply and uniformly in 
