NOTES OX THE ETHIOPIAN FRUIT-FLIES — I. 237 



S(l 1). Third abdominal segment with a complete whitish cross band at hind border ; 

 size greater (5-7 mm.). 



9(10). Face creamy white on its lower tw r o-thirds ; wings with a triangular hyaline 

 indentation at fore border before the stigma and with the cubital band 

 narrower than the length of the hind cross- vein . . nigrum, Grab. 



10(9). Face entirely shining black, with only a reddish mouth-border ; wings 

 entirely infuscated before the stigma and with the cubital band as broad 

 as the hind cross-vein . . . . . . . . . . gagatinum, sp. nov. 



11(8). Third abdominal segment with only two greyish, triangular spots towards 

 its middle ; frons and occiput of a bright reddish colour ; size smaller 

 (not over 4 mm. ) . . . . . . . . ... . . occipitale, sp. nov. 



12(7). The short pubescence on back of thorax entirely whitish; scutellum with 

 two small yellow dots at hind border. 



13(14). Base of wings hyaline, with a narrow dark band extending from the humeral 

 cross- vein to the anal cell ; halteres pale ; pleurae grey dusted ; scutellum 

 with two bristles only . . . . . . . . bimaculatum, v. Rod. 



14(13). Base of wings entirely fuscous, with or without hyaline spots, but with 

 no distinct isolated band ; halteres black ; scutellum with four bristles. 



15(16). Wings with no hyaline indentation at fore border before the stigma, or if 

 with an indistinct one, the costal vein at any rate entirely black ; face 

 more or less broadly darkened . . . . . . nigerrimum, Bezzi. 



16(15). A well developed hyaline indentation at fore border before the stigma, and 

 the costal vein there broadly pale yellowish ; face entirely cream white, 

 or only narrowly infuscated above, near the root of antennae. 



17(18). Wings with the stigma infuscated and wdth the hyaline space between the 

 marginal and cubital bands ending before the small cross- vein ; tibiae 

 mainly yellowish . . . . . . . . . . . . leucopsis, var. nov. 



18(17). Wings with much paler stigma and with the above-named hyaline space 

 extended to the small cross-vein, at least above ; tibiae mainly black 



coffeae, var. nov. 



1. Trirhithrum lycii, Coquillett, Proc. U.S. Nation. Mus., xxiv, 1901, p. 30. 



Originally described from specimens bred from Lycium sp. in the Cape Colonv 

 and not found subsequently. This species agrees in general wing pattern with the 

 present genus, but is in some respects very different from the other species, and its 

 position here is therefore very doubtful. 



It is evidently congeneric with Ceratitis loranthi, Froggatt (Proc. Linn. Soc. 

 N.S.W., xxxv, 1910, p. 863), bred at Perth, W. Australia, from fruits of Loranthi s 

 pendulus growing on Eucalyptus sp., and of which I have original specimens before 

 me. The two species have a very similar thorax and wing pattern ; but while in 

 lycii the middle band of the wings is complete and reaches the hind margin, in 

 loranthi it is reduced to a long tooth, which reaches but does not pass the 4th 

 longitudinal vein. The head is not narrowed in profile and the eyes are rounded ; 

 the arista is nearly bare (Coquillett does not mention it in lycii) ; the dc. are placed 



