225 
ON A NEW TYPE OF FUNGUS: COELOMOMYCES 
STEGOMYIAE N.G., N.SP., PARASITIC IN THE BODY- 
CAVITY OF THE LARVA OF STEGOMYIA SCUTELLARIA 
WALKER (DIPTERA, NEMATOCERA, CULICIDAE). 
By D. KEILIN, Sc.D., 
Beit Memorial Research Fellow. 
(From the Quick Laboratory , University of Cambridge.) 
(With 7 Text-figures.) 
CONTENTS. 
PAGE 
I. Localisation of the parasite in the body of Stegomyia larva . 225 
II. Mycelium of the parasite ....... 226 
III. Development and structure of sporangia .... 228 
IV. Development and structure of spores ..... 230 
V. Probable mode of infection . . . . . . .231 
VI. Systematic position of Coelomomyces stegomyiae . . . 232 
VII. Parasites of mosquito larvae ...... 232 
VIII. References .......... 234 
I. LOCALISATION OF THE PARASITE IN THE BODY 
OF STEGOMYIA LARVA. 
Among six parasitised larvae of Stegomyia scutellaris Walker, collected by 
Dr W. A. Lamborn in the Federated Malay States, five contained a ciliate 
which I have described (Parasitology, xm. p. 216) under the name of Lambor- 
nella stegomyiae n.g., n.sp., while the remaining larva harboured a new parasitic 
fungus which forms the subject of this communication. The larva had been 
fixed and was preserved in formaldehyde solution (10 per cent.) and was 
labelled: “Larva of Stegomyia scutellaris Walker. Infestation with protozoal 
parasite and a luxuriant growth of Vorticella. Kajang,” by Dr Lamborn. When 
the larva was examined under a low power the surface of its body was found 
to be extensively covered with tufts of Vorticella, whilst its interior harboured 
an enormous number of parasites which in the gills and the posterior segments 
were packed in solid masses completely filling these parts (Fig. 1). As seen by 
transparency the parasites are oval in shape, 37*5 to 57 g long and 20 to 30 g 
in diameter, surrounded by a more or less thick yellowish wall. In their 
external appearance, size, and position in the host, they are so surprisingly 
similar to Lambornella that it was at first quite natural to take them for the 
resting stages or cysts of this ciliate. It is sufficient to compare Fig. 1 of this 
Parasitology xin 
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