270 J. M. DALZIEL. 



Culiciomyia nebulosa, Theo. 



Eretmopodites quinquevittatus, Theo. 



Hodgesia sanguinis, Theo.* 



Micraedes inconspicuosus, Theo. 



Mansonioides africanus, Theo., M. uniformis, Theo.* 



Ochlerotatus apicoannulatus, Edw., 0. argenteopunctatus, Theo.,* 0. caligi- 

 nosus, Grah.,* 0. cumminsi, Theo.,* 0. domesticus, Theo., 0. irritans, Theo., 

 0. nigricephalus, Theo., 0. ochraceus, Theo.,* 0. punctothoracis, Theo.* 



Stegomyia africana, Theo., S. fasciata, F., S. luteocephala, Newst. 



Taeniorhynchus annetti, Theo.,* T. aurites, Theo.,* T. metallicus, Theo.* 



Uranotaenia annulata, Theo., U. balfouri, Theo.,* U. bilineata, Theo. yslt. fraseri. 



(N.B. — Species marked with an asterisk have not been found in the larval state 

 within the period dealt with in this paper, but the larvae of C. quasigelidus, 

 0. caliginosus, 0. punctothoracis, and U. balfouri have been recorded by Graham 

 from borrow-pits at Yaba (Bull. Ent. Res. i, pp. 32, 39, 50). Breeding-places of 

 the other species are referred to in the text.) 



Of the 5 species of Anopheles, A. costalis is universally distributed over the island 

 and is very abundant in the rains ; it also makes an appreciable figure in the returns 

 from domestic receptacles. Its eradication is one of the chief objectives of sanitary 

 effort. 



A. mauritianus is a rarity, but it has been bred from larvae in a roof-gutter 

 and captured once or twice in European quarters ; the larvae have also been taken 

 in a pond and in road puddles at Yaba on the mainland. 



A. funestus was bred from slightly brackish water in a canoe. 



A. obscurus was captured once in a native house, but has not been taken in the 

 larval state. 



A. nili is found now and then in European houses in the Golf-course and Race- 

 course residential area, and in offices and native houses in the town. Its larvae 

 have not been obtained, but no doubt have their origin in the stagnant waters 

 which abound on the island. The imagines when found have always been in such 

 very scanty numbers that its influence as a malaria carrier seems almost negligible 

 at present. The circumstances which favour the prevalence of one species over 

 another are, however, incompletely understood, and as these may conceivably 

 alter in unexpected ways or in conditions beyond immediate control, it is well to bear 

 its presence in mind, and to discover and deal with its sources. For similar reasons 

 the above notes and record of species found in Lagos within recent years, even 

 if little more than a bare recital of names, may at any time prove of interest and 

 possibly of practical use to future workers. 



