NEW ETHIOPIAN FRUIT-FLIES OF THE GENUS DACUS. 65 



2. Dacus annulatus, Becker, 1903 (fig. 2). 



An elegant species, well distinguished by the entirely black yellow-marked 

 body, by the unspotted face, by the single hypopleural spot, by the unciliated 

 third abdominal segment of the male, and by the lack of the anal stripe on the wings. 



The face is unspotted, but usually there is a more or less developed black or 

 blackish spot on the upper edge of the clypeus, just below the base of antennae. 

 All the bristles are black ; two pairs of distant lower fronto-orbital bristles ; only 

 the external scapular bristles are well developed, the middle ones being 

 rudimentary ; no anterior supra-alar ; pteropleural well developed. The sutures 

 of the abdominal segments are partly fused in the middle. The legs are pale 

 yellowish, as described by the author ; but in some (J specimens the apical third 

 of the hind femora, and sometimes the whole of the hind tibiae, are black. Wings 

 (fig. 2) with the second longitudinal vein short, the fourth segment of the costa 

 being about one-third the length of the fifth ; prolongation of the anal cell not 

 longer than its distance from the hind border. 



Fig. 2. Dacus annulatus, Becker. 



The present species was collected by Ehrenberg in Egypt about a century ago 

 and described rather recently by Becker from the original specimens ; I have 

 before me numerous examples from Ghinda, Erythraea, December 1916, collected 

 by Dr. A. Mochi, who has found the species very common there. This species 

 has already been recorded from Erythraea (Asmara, leg. Kristensen) by Dr. Enderlein 

 and by Dr. Speiser, both in 1911. 



3. Dacus mochii, sp. nov. (fig. 3). 



Nearly allied to the preceding species, but at once distinguished by the very 

 differently coloured frons and abdomen, and by the peculiar wing-pattern. 



cJ. Length of body, 5 '5-6 mm. ; length of wing, 4*5-5 mm. 



Occiput shining black above, with a narrow yellowish border, and pale yellowish 

 below ; ocellar dot black ; frons with the basal half infuscated, the apical half 

 pale yellowish, destitute of blackish lateral dots ; lunula shining brown ; face pale 

 yellowish, immaculate, shining only along the antennal grooves ; peristomial spot 

 wanting. Antennae of moderate length, the first joint not elongated ; they 

 are dark yellowish, with the third joint infuscated at the distal end ; palpi and 

 proboscis pale yellowish. The bristles of the head are black ; there are two pairs 

 of lower fronto-orbitals, one very near the dividing line between the face and frons, 

 the other at the level of the dividing line between the dark and the clear portions 

 of the frons. Thorax entirely black, even on the pleurae, with short whitish 

 (C365) f. 



