ETHIOPIAN FRUIT-FLIES OF THE GENUS DACUS. 89 



6 (3). Wings without such a spot, but with the brown fore border extended to the 

 fourth vein or to the middle of the first posterior cell ; species of smaller size (8-9 

 mm.), with a distinct humeral spot and a very broad mesopleural stripe. 



7 (10). Two yellow hypopleural spots ; facial black spots always separated. 



8 (9). Humeral calU entirely yellow ; the three yellow thoracic stripes rather 

 broad ; facial black spots reaching the epistome in a point ; ovipositor as long as 

 the abdomen 3. armatus, F. 



9 (8). Humeral calli brown, with only a small yellow spot on the fore corner ; 

 thoracic post-sutural stripes narrow, the middle one often indistinct ; facial spots 

 rounded and removed from the epistome ; ovipositor short . . 4. bivittatus, Big. 



10 (7). A single hypopleural spot ; humeral caUi entirely of a yellowish white 

 colour ; facial spots often united, chiefly in the male ; hind femora entirely 

 yellow ; fourth longitudinal vein straight. 



11 (12). Brown fore border of the wing not reaching the fourth vein, but there is 

 a brown stripe along this vein ; three post-sutural stripes on thorax ; frons entirely 

 yellow in the middle 5. momordicae, nom. nov. 



12 (11). Brown fore border extended without interruption to the fourth 

 vein ; middle thoracic stripe wanting ; frons ^dark brown with yellow spots. 



6. eburneus, sp. n. 



13 (2). Wings with the brown fore border not extending over the third longitudinal 

 vein, or doing so only at apex, sometimes without any dark border and only with a 

 brown apical spot. 



14 (15). Scapular bristles thin and rudimentary ; hypopleural and humeral spots 

 wanting ; mesopleural stripe very narrow ; scutellum entirely brown ; no facial 

 black spots ; wings broadly yellow towards the middle, with a blackish spot at end 

 of third vein and a brown stripe along the anal vein. . . 7. xanthopterns, sp. n. 



15 (14). Scapular bristles strong and long ; species without the preceding 

 characters ; face always with black spots ; wings not yellow, but with the small 

 cross- vein more or less infuscated. 



16 (17). A single hypopleural spot ; humeral calli brown, with a narrow, less 

 distinct yellowish spot on the fore corner 8. humeralis, si^. n. 



17 (16). Two hypopleural spots ; humeral calli entirely yellow or almost so. 



18 (19). The two hypopleural spots are very small and broadly separated ; 

 humeral calli margined with black ; facial black spots very small ; wings with a 

 pale fore border and without apical spot 9. disjunctus, sp. n. 



19 (18). Hypopleural spots broad and contiguous ; humeral calli entirely yellow ; 

 facial spots broad and rounded ; wings with a blackish fore border and with a dark 

 apical spot extending over the third vein 10. jmnctatifrons, Karsch. 



20 (1) . Thorax with only two supra-alar macrochaetae, the anterior one being entirely 

 wanting ; smaller species (5-10 mm., but usually 5-8 mm.), with the wing pattern 

 reduced to a narrow fore border or to an apical spot, sometimes entirely wanting 

 (Dacus, s. str.). 



21 (22). Face without black spots ; two contiguous hypopleural spots ; wings 

 with a black stigma and a small black spot at the end of the third vein. 



11. immaculatus, Coq. 



