HABITS OF GLOSSINA FUSCA. 145 



settle on and bite one. There were none to be found at their usual eveninof 

 haunt on the path, which w^as only a few^ yards distant. G,fusca rests with 

 the head directed upwards or dow^nwards and raised off the tree-trunk by 

 the legs : the abdomen, at its hinder part, almost touches the tree ; some- 

 times it moves sideways on its legs round a tree-trunk on seeing an intruder 

 approach. One pair was observed in coitu on a tree at midday, the terminal 

 abdominal segment of the male, w^hich was on the back of the female, being 

 curved round the terminal segment of the latter ; at intervals the male made 

 a rapid vibratory movement of the wings : the wings of the female were 

 slightly abducted from the body. They w^ere so firmly locked that one w^as 

 able to capture and kill them without causing separation. Attempts to find 

 larv?e and puppe by digging round the bases of various trees w^ere unsuccessfuL 



Relation to Game, 



At all places w^here G. fusca was found, game (antelope, w^arthog, etc.) 

 was abundant. On one occasion, after searching for tsetse for some time 

 without success, I came upon and shot two bush-pigs about sunset, and on 

 going up to them found several G. fusca alighting upon and apparently 

 trying to suck blood from the pigs. This w^as in the w^et season. One female 

 extruded an immature larva on capture. 



Relation of the Sexes. 



Of 117 G. fusca captured at Kaporo in the evenings in August (dry 

 season), all were males. Seven were captured at the same place and time of 

 year about midday, and of these four w^ere males and three were females. 



'Trypanosomes in the Abdominal Contents. 



Twenty-two males were examined : in tw^o, very numerous trypanosomes, 

 resembling T. grayi, were found ; in the others examination gave a negative 

 result. 



[To the above valuable and interesting account of the habits of G. fusca, 

 it may be well to add the followdng notes recently received from Dr. E. H. 

 Allon Pask, Medical Officer, Dowa, Nyasaland : — " G. fusca. Lake shore, 

 between Mkula River and Chima River ; collected 18.iii.l0, on native path 

 and in village, 7-9 a.m., sandy soil, scant vegetation, and also in track 

 through high grass, scantily w^ooded. Edge of Lake Nyasa about 400 yards 

 away, in other places further still ; separated from water by high reeds. 

 Wet season. Found in association with. G. morsitans. Fly not numerous, 

 about a dozen G. fusca caught and two G. morsitans."" And again : " G. fusca. 

 Lake shore, mouth of Lingadni River, collected 19.iii.lO, in a village ; one 



