﻿RESEARCH IN BRITISH WEST AFRICA. 163 



obtained. These have been described by Dr. Leiper. Both belonged to new- 

 genera, one in the family Anchylostomidae, Acheilostoma simpsoni, the other 

 in the family Strongylidae, Tr achy pharynx nigeriae. 



(12) Ilesha. 



The district of Ilesha may be described as an undulating plain situated in the 

 forest belt ; it is well watered by numerous streams and is surrounded on all sides 

 except the north by ranges of steep hills. The rainfall is about 50 inches 

 annually. Game is scarce, but a few antelope, some leopards and several species 

 of monkeys are to be found. 



The region known as Ekiti is separated from Ilesha by a range of precipitous 

 hills, the Efon Range, of about 600 feet above the level of the surrounding 

 country. The area to the south is covered with forest, with occasional stretches 

 of low scrub. To the north, for the most part, the country is open, with small 

 belts of forest along the water-ways. Three large rivers, the Oshun, the 

 Ogbesse and the Owena rise in this district. Antelopes of all descriptions, bush- 

 cow, leopard and pig are abundant. Our knowledge of the blood-sucking insects 

 of the district is principally due to Capt. L. E. H. Humfrey, but collections have 

 also been made by Dr. T. F. G. Mayer and Capt. A. H. Blair. The following 

 are the chief species found among the Diptera : — Glossina fusca, G. palpalis, 

 Tabanus kingsleyi, T. mificrus, T. pluto, T. besti, Chrysops silacea, Rliinomyza 

 stimulans, Culiciomyia nebulosa, Stegomyia fasciata, Eretmopodites inornatus, 

 E. quinquevittatus, and Mucidus mucidus. 



SlPHONAPTERA :—Dermatophilus penetrans and Ctenocephalus canis. 



Mallophaga : — Trichoclietes climax, on goats. 



IxODOIDEA : — Bhipicephalus sanguineus and Haemaphysalis leachi. 



There remain to be considered only a few localities from which blood-sucking 

 insects have been recorded, and which are not included in the foregoing sections. 

 These are, Lagos, the capital of the Colony ; Yaba, the headquarters of the 

 Medical Research Institute ; and a few isolated localities on the Lagos Govern- 

 ment Railway. 



(13) Lagos and Yaba. 



From the town of Lagos itself the only blood-sucking flies so far recorded 

 have been mosquitos. Recently Dr. W. M Graham undertook a mosquito 

 survey of this town, and an account of his results has already been published in 

 this Bulletin. It is, therefore, only necessary for me to give a list of the species 

 found. They are as follows : — Stegomyia fasciata, Culiciomyia nebulosa, Culex 

 duttoni, Culex tigripes var. fuscus, Culex decens, Myzorhynchus obscurus 

 and Myzomyia costalis. I may also mention that while resident at Yaba I 

 obtained numerous fleas from rats sent to Dr. Connal for examination. These 

 were all Xenopsylla brasiliensis with the exception of one male Xenopsylla cheopis, 

 the transmitter of plague. I believe this is the only record of this flea from 

 Southern Nigeria, though it is very common on the Gold Coast, 



25110 p 2 



