166 DR. SCHWETZ. 



the line of the watershed, while the surroundings of the Kabongo-Kisengwa route 

 are still savannah. In other words, the park begins (or ends) here close to the line 

 of the Lualaba-Lomami watershed. 



As regards G. morsitans, I must admit that the result was somewhat unexpected. 

 I found the species only in small numbers, and not ubiquitous. Theoretically, 

 morsitans exists more or less in all parts after the village Gona ; but it is very rare 

 everywhere. I found it in fair quantities between the villages Gona and Kataba, 

 and in very small numbers around the village Mbaie and between Mbaie and Minda. 

 I think the reason is that from Gona to Katompe the western side of the park is 

 followed, and I have already noted in my preceding paper the fact that G. morsitans 

 sometimes disappears a little before the final termination of the park. 



I would say in passing that I found two other species of Glossina throughout the 

 route after Gona, namely, G. brevipalpis (fair number) and G. pallidipes (small 

 number). 



From Katompe to Kabala. 



Generally park country, but thin in some places, here and there several large 

 clearings. G. morsitans throughout the route (in fair numbers), and brevipalpis and 

 pallidipes also. 



From Katompe to Kongolo. 



Park country, as from Katompe to Kabala, but not continuously typical park, 

 which disappears a little before Kongolo and especially between the villages Kalengo 

 and Masembe. G. morsitans occurs, although in small numbers, as far as Kalenge 

 (associated with brevipalpis and pallidipes). 



From Kongolo to Kabinda by way of Kifukutu (Lomami). 



I would begin by explaining that from just before the source of the river Kafuy, 

 that is, from a little way before the Lualaba-Lomami watershed, the grassy savannah 

 begins and stretches as far as the Lomami and beyond, on the west. I need scarcely 

 say that here not a single morsitans exists. 



But the case is more complicated with regard to the first part of the route in 

 question, from the Lualaba up to near the source of the Kafuy. As regards 

 vegetation, this stretch is a succession of patches of park, wooded savannah, grassy 

 savannah and even strips of forest. It is probably the northern or north-western 

 limit of the great Katanga park. G. morsitans is here at first glance as inconsistent 

 and capricious as the vegetation, but more attentive observation shows .a perfect 

 consistency in the uneven distribution of the fly, which is found only in those spots 

 where the vegetation is park-like. This then is probably the northernmost extension. 

 the outermost limit of that great area over which G. morsitans is distributed. And 

 I would add that, even where it exists, morsitans is very scarce in this region. 

 Indeed, it must be sought for so carefully, that for practical purposes it perhaps 

 need not be taken into account. Places are marked on the map where I have found 

 morsitans. The last place, the most western point, is the village Katongwe, near 

 to the river Kafuv. 



