GLOSSINA MORSITANS IN NORTHERN RHODESIA. 75 



Kafiie R., Ohutika and Nawalia on the Lnangwa, and Ngoa and Kashitii on the high 

 plateau. This gives an east to west range of over 400 miles, and a north to south 

 range of over 200 miles. The percentage of infection is sometimes heavy. 



At Chutika the MulUhi was obtained in 80 cases from 1,164 pupae (7 per cent.). 

 Of these 76 were collected in a stretch of mopani forest among 477 pupae (16 per cent.), 

 and 4 from a sandy stream bed among 717 pupae (-5 per cent.). They were collected 

 during July and the insects emerged between 15th August and 6th October ; 61 of 

 them during September. Eleven of them were badly damaged in collecting or were 

 kilted for examination in early stages. The remaining 69 produced 46 females and 

 23 males. The latter sex appears to be dimorphic, 10 of them having the thorax 

 entirely black, and 13 with the dorsal surface red, as in males at Mwengwa. At 

 Nawalia the males have the thorax black and at Ngoa dorsally red. No other 

 differences were found, but a final opinion is not expressed as to whether they are all 

 of one species. 



At Nawalia from 155 pupae collected in a sandy stream bed 20 (13 per 

 cent.) parasites were obtained, a quarter of them being males. These were collected 

 on 21st and 23rd August, and the insects emerged between 25th September and 

 26th October. 



At Ngoa 14 were obtained from 2,500 pupae, collected in September, the insects 

 emerging between 28th September and 12th October. The parasite was very 

 localised here, only being found in one small area. Nine of them were taken on 4th 

 September among a total of 32 pupae, the others being taken subsequently within 

 half a mile of the same place. A few of the old cocoons were also seen in this locality, 

 but over the rest of the Ngoa area none could be found in some 4,000 empty cases 

 examined. 



At Kashitu, up to December 1915, two females have emerged and a number of the 

 characteristic cocoons have been seen. 



(2). Anastatus viridiceps, Wtrst., was first met with by the -writer at Kashitu in 

 November 1914. In the present year it has been taken four times in the same locality, 

 but has been seen nowhere else. Pupa- cases from which a Chalcid of about the same 

 size had emerged were taken, however, at both Chutika and Ngoa. In each case 

 15 of the insects emerged from the puparium, the largest number of males emerging 

 being six, and the lowest tw^o. Fertilisation took place readily, but the attempt to 

 breed the insect failed. Fertilised females were exposed in beakers to four newly 

 deposited pupae and to eight larvae, the heavily pregnant tsetse being enclosed in 

 the vessels and larvipositing there. The pupae all produced perfect flies. 



(3). Stomatoceras micans, Wtrst., a large species first met with by Eminson at 

 Mwengwa, was taken on two occasions at Ngoa in September. In each case a 

 single female emerged. The entire contents of the tsetse puparia are not 

 devoured, in one case the debris being an unrecognisable mass and in the other an 

 almost fully developed fly. 



(4). Syntomosphyrum ghssinae, Wtrst., a very small species, also taken by 

 Eminson at Mwengwa, was met with eight times at Ngoa and five times at Kashitu. 

 It was not seen in the Luangwa Valley, but probably occurs there, as six empty 

 puparia bored by the tiny hole which this species makes were found. The numbers 



