﻿188 JAS. J. SIMPSON — ENTOMOLOGICAL 



0) G-. palpalis-group. 



Belonging to this group there are no fewer than four species found in Southern 

 Nigeria. By far the most widely distributed of these is G. palpalis, which 

 may be said to follow all the different river systems. This, however, is not 

 surprising when it is remembered that, no matter how widely separated are the 

 origins of these river systems, they are all linked up along the coast region by a 

 series of lagoons and creeks. In the Western Province this species has been 

 found on the Yewa Eiver, and probably extends to Meko and beyond. It also 

 occurs in the lagoons near Lagos, at Agege, and further north on the Ogun Kiver 

 near Aro. Further east, it has been recorded from the basin of the Oshun River, 

 at Oshogbo, while in the same system it has been found between the Oshun and 

 the Oni Rivers, at Ilesha and elsewhere in this district, and also on the Oni River 

 itself. It may be said to be ubiquitous in the Niger system and especially 

 abundant in the delta — while extreme records in this area are Benin City and 

 Agbor. It is also found in the basin of the Imo, for example at Bende and 

 between Okigwi and Afikpo ; moreover it is everywhere abundant in the Cross 

 River area. 



It is interesting to note that in the Niger delta region the specimens belonging 

 to this species, as at present known, are rather darker and larger than the typical 

 forms, while these diminish in size and become much paler in colour north of 

 Aboh and Onitsha. 



Glossina tackinoides has been recorded from only two places in Southern Nigeria, 

 namely, Ikom and Bende. It is extremely common in Northern Nigeria, and the 

 record from Ikom is not surprising, but its occurrence at Bende would seem to 

 indicate that it may be found more commonly in the Cross River basin than is 

 supposed. 



Glossina caliginea. This species, only recently described, has been recorded 

 from comparatively few places, but these are so widely separated that it will 

 probably be found to occur along the whole of the coast belt. As will be seen 

 from the map, it occurs on the Yewa River, Oni River, Niger Delta, Kwa-Ibo 

 River and the Cross River. So far, this species has been found only in this 

 Colony. Nothing is known of its habits or life-history beyond the fact that it is 

 a ferocious biter. 



Glossina pallicera is one of the rarest of the West African species of Glossina. 

 A single specimen taken by the writer at Benin City, in March, 1910, is so far 

 the only record from this Colony. 



(b) G. morsitans-group. 



Of this group only one species, G. longipalpis, is known from Southern Nigeria. 

 Although G. submorsitans is very common in Northern Nigeria, it is not found 

 so far south as this Colony, but if the Shaki district were examined, it is 

 possible that it would be found there. 



G. longipalpis is known to occur in Southern Nigeria, in the drier parts of the 

 northern districts of the Western Province, and also in similar situations in the 

 Central Province. 



