216 
ON A NEW CILIATE: LAMBORNELLA STEGOMYIAE 
N.G.,N.SP., PARASITIC IN THE BODY-CAVITY OF THE 
LARVAE OF STEGOMYIA SC U TELL A RIB WALKER 
(DIPTERA, NEMATOCERA, CULICIDAE). 
By D. KEILIN, Sc.D., 
Beit Memorial Research Fellow. 
(From the Quick Laboratory , University of Cambridge.) 
(With 6 Text-figures.) 
CONTENTS. 
PAGE 
1. Introduction ......... 216 
II. Description of Lamborndla stegomyiae, n.g., n.sp. . . 217 
III. Reproduction ... 220 
IV. Encysted stage .220 
V. Mode of Infection ........ 222 
VI. Diagnosis of Lambornella stegomyiae ..... 223 
VII. Appendix: (a) The Ciliate Parasites of Insects . . . 223 
( b ) The Ciliate Parasites of Arthropods in general 223 
VIII. References ......... 224 
I. Introduction. 
The material which forms the subject of this communication was derived from 
Dr W. A. Lamborn’s collection, and was placed at my disposal through the 
kindness of Dr Guy A. K. Marshall, Director of the Imperial Bureau of En¬ 
tomology, London. It comprised eight larvae of Stegomyia scutellaris Walker, 
which had been preserved in formaldehyde solution (10 per cent.), and the 
specimens were mounted individually on microscope slides in the same medium. 
Examined in transmitted light, the preparations showed the body-cavities 
of the larvae to contain large numbers of the parasites, a feature which had 
already been described by Lamborn (1921). 
From the nature of the preparations, it may be imagined that it was a 
matter of no small difficulty to carry out the detailed examination of the 
cellular structure of the organisms. It was, of course, necessary to remove 
specimens from the body of the host for the purpose of cytological study. The 
procedure which I adopted was as follows: the larvae were first examined 
in toto, and sketches were made in order to show the general distribution of 
the parasites in the larval body. 
