NOTES ON THE ETHIOPIAN FRUIT-FLIES — II. 35 



4(1). Third antennal joint rounded at end ; body with black bristles and with 

 dark-striped or dark-spotted thorax or abdomen ; wings with a coloured 

 stigma and devoid of deep black central spot. 



5(6). Stigma entirely black ; wings with a broad black border, in which are 

 included a few sharply defined hyaline marginal spots praetexta, Loew. 



6(5). Stigma black, with a broad hyaline spot at base ; wings without the above 

 described pattern. 



7(8). Wings with a distinct dark band, which includes several hyaline spots, 

 across the middle, apical hyaline spot much narrower than the space 

 between the ends of the 3rd and 4th longitudinal veins ca/^ra, Loew. 



8(7). Wings devoid of a distinct dark middle band ; apical hyaline spot extending 

 over the whole space between the above-named veins. 



9(10). Thoracic dark stripes less distinct ; subapical dark spot of the wings inter- 

 rupted by some hyaline streaks . . . . . . dissoluta, Loew. 



10(9). Thoracic stripes sharply defined ; subapical spot not interrupted 



tristrigata, sp. n. 



1. Euribia perpallida, sp. nov. 



A handsome species, forming with the following one a distinct group, characterised 

 by the sharp point of the third antennal joint and by the peculiar wing pattern. 



<J$. Length of the body, 2 "5-3 mm. ; of the ovipositor, T5 mm. ; of the wing, 

 2 '5-3 mm. Head entirely pale yellowish, with only a black, grey- dusted, double 

 spot on middle of the occiput ; frons flattened, not at all prominent, about as broad 

 as long, with a greyish ocellar spot and with a more or less distinct longitudinal 

 yellow middle stripe ; face short, not prominent at the mouth-border ; cheeks 

 linear ; jowls narrow and unspotted. Antennae entirely pale reddish, as long as 

 the face ; third joint with a sharply produced upper angle ; arista whitish, bare. 

 Proboscis thick, not bicubitate, yellowish ; palpi pale yellowish, with short and whitish 

 bristles at end. In profile the head is higher than broad, and is wholly occupied 

 by the rounded eyes. Cephalic bristles pale yellowish, those of the occipital row 

 thick but rather acute at end ; oc. rather short ; 2 lower or. ; in the male specimens 

 there is a pair of bristles in the middle of the frontal band, about as strong as the 

 oc, but wanting in the female.* Thorax densely clothed with grey dust and with 

 yellowish pubescence ; the pleural sutures are reddish ; there are no distinct dark 

 stripes on the back, only the bristles being placed on small black dots ; scutellum 

 like the thorax, but paler, and in the female with two fuscous dots ; mesophragma 

 black, grey-dusted. All the bristles are pale yellowish ; the dc. are placed much 

 before the line of the a. sa. ; the middle scutellar pair is weak and crossed. Halteres 

 yellowish. Abdomen pale yellowish ; in the male there is a very narrow, blackish- 

 grey, basal band on the 2nd and 3rd segments, and a broader one, divided into 

 two broad spots, on the 4th segment ; in the female these basal dark bands are more 

 developed ; the pubescence and the bristles are yellowish ; male genitalia pale 

 yellow ; ovipositor shining reddish with black end, flattened, of elongate triangular 



* These bristles seem to be homologous with the crossed frontal pair {Kreuzborsten) 

 of the Anthomyiidae ; their presence here may be accidental, as such bristles are not 

 known to occur in the Trypaneidae ; but the present case is very important theoretically. 

 (C455) c2 



