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Coelomomyces stegomyiae 
paper with Fig. 1 (p. 218) of the paper on Lambornella to appreciate this mis¬ 
leading resemblance. The detailed study of the structure of this new parasite, 
however, showed that we were dealing not with the cysts of Lambornella, but 
with a totally different organism belonging to the Fungi. 
For the study of this new parasite which I propose to name Coelomomyces 
stegomyiae n.g., n.sp., the best results were obtained (a) by teasing up pieces 
of the larva in lactophenol, either pure or after the addition of a drop of cotton- 
blue, and (b) by studying sections of the larva stained in glychaemalum or iron 
haematoxylin and eosin. 
Fig. 1. Stegomyia scutellaris Walker. Posterior extremity of larva with three gills, G; and the 
respiratory siphon, S; packed with sporangia— spr. of Coelomomyces stegomyiae. 
The sections show that, although the larva is very heavily infected and 
lacking one gill, its internal organs are apparently healthy, but for the fat body 
which has completely disappeared (Fig. 2). 
II. MYCELIUM OF THE PARASITE. 
Portions of the parasitised larva, examined in the manner described, showed 
not only the oval bodies previously referred to, but also fragments of true 
mycelium. There is little mycelium in the body-cavity, only a few branches 
being seen in sections, but the mycelium is well-developed immediately around 
the viscera, especially the midgut (Fig. 4) and the five anterior intestinal coeca, 
