222 
DESCRIPTION OF A HERPETOMONAS PARASITIC IN 
THE ALIMENTARY TRACT OF THE COMMON GREEN- 
BOTTLE FLY, LUGILIA SP. 
By C. STRICKLAND, M.A., B.C., 
Assistant to the Quick Professor of Biology in the University of Cambridge. 
{From the Quick Laboratory, Cambridge.) 
With Plates VIII and IX and 2 Text-figures. 
A Herjoetomonas has been previously recorded in species of Lucilia 
by Patton in India (1908) and by Roubaud in the Congo (1908), but 
neither observer has described the parasite. 
The following paper is concerned with the description of a Herpe- 
tomonas found in two species of Lucilia which infest butcher’s shops in 
Cambridge. It is set out under the following heads : 
PAGE 
Note on the digestive tract of Lucilia .222 
The methods of examination of the gut contents . . . 223 
Morphology .......... 223 
Taxonomy ........... 229 
The method of infection of the fly.230 
Biology. 231 
Physiology ........... 232 
Summary and conclusions ....... 234 
Eeferences.235 
Note on the digestive tract of Lucilia. 
The alimentary tract of Lucilia is similar to that of Musca domestica 
and allied Diptera. The oesophagus (Fig. 1) leads to the midgut, which 
commences at a valve-like organ, the proventriculus. Before reaching 
the proventriculus, however, it branches to form the oesophageal 
