396 W. M. ADERS, 



Ochlerotatus longipalpis, Griinb. All larvae of this species have been obtained 

 from holes in mango trees in association with Toxorhjnchites brevipalpis. The larvae 

 have a, peculiar faint rose colour, and are easily recognised by their habit of hanging 

 suspended for considerable periods of time in the middle of their breeding water. 

 All attempts to feed adults on hmnan blood failed. The characters of the larva are 

 as follows : — 



Head large, dark brown in colour, with prominent well-developed brushes, the 

 lateral clypeal hairs bifurcated ; maxillae well developed, pendant and supplied with 

 brushes. Antennae long, cylindrical, with one hair near the apex of the basal joint. 

 Thorax small in comparison with the head, having the usual plumes, the median one 

 slightly longer than the others. Abdomen with plumes on the first two segments ; 

 the comb composed of 30 to 40 small scales. Siphon straight, as long as the 6th, 

 7th and 8th segments ; pecten with 26 teeth. 



Ochlerotatus fulgens, Edw. A few specimens were bred from larvae captured in 

 a hole in a mango tree, and were mistaken for 0. longipalpis. 



Ochlerotatus irrilans, Theo. Has been taken from various localities, chiefly in 

 large swamps. 



Ochlerotatus albocephalus, Theo. One record. 



Ochlerotatus adersi, Edw. Larvae were taken in holes in African almond trees 

 in association with Stegomyia metallica. 



Eunielanomyia inconspicuosa, Theo. Larvae obtained under the same conditions 

 as the former species. 



Banksinella lineatopennis, Ludl. A rare form, represented in our collection by 

 two specimens. 



Cyathomyia fiisca, Theo. Larvae taken in tree-holes. 



Eretmopodites quinquevittatus, Theo. As previously mentioned, common in the 

 town, also recorded from various out-districts. 



Eretmopodites chrysogaster var. subsimplicipes, Edw. A few specimens taken 

 with Eretmopodites quinquevittatus. 



Mansonioides uniformis, Theo. No records from Zanzibar, but several adults 

 have been captured on the island of Pemba in association with Anopheles funestus. 



Toxorhynchites brevipalpis, Theo. Ubiquitous ; we have specimens from many 

 localities, including the town. Nearly every mango tree with holes in the trunk 

 harbours from three to eight larvae. They are predaceous on larvae of A. costulis, 

 S. fasciata, and C. fatigans ; but as these three species are rarely found under such 

 conditions, the Toxorhynchites is not of much practical value. 



Mimomyia mimomyiaformis, Newst. Recorded from one locality. 



Mucidus mucidus, Karsch. Adults have been taken in houses in close proximity 

 to the town. Larvae were foimd on only one occasion, in an old cement tank con- 

 taining water rich in decaying vegetation. 



Taeniorhynchus fuscopennatus, Theo. Adults have been captured in houses in 

 Pemba, the females heavily engorged with blood. No specimens have been recorded 

 from Zanzibar Island. 



