NEW ETHIOPIAN FRUIT-FLIES OF THE GENUS DACUS. 67 



(J?. Length of body, 5*5-6 mm. ; length of wing, 4*5-5 mm. The species differs 

 from M. mochii in the following points : — 



(1). The basal half of frons is yellowish, and therefore there is a very distinct 

 dark transverse band on the middle ; the lunula is pale yellowish, not brown. 

 (2). The thorax is prevalently of a reddish, not black, colour, chiefly in front and on 

 the pleurae ; all the markings and the scutellum are of a bright yellow colour ; the 

 mesophragma is distinctly reddish on the sides, not entirely black. (3). The 

 abdomen has the second segment more broadly yellow ; the longitudinal yellow 

 band is broader and has no middle black line in the male. (4). The wings have the 

 base of the submarginal cell broadly infuscated, but this infuscation is not con- 

 tinued over the upper end of the small cross -vein. 



The female is very like the male, but the abdomen has the second segment more 

 broadly black, and there is a middle black line in the longitudiual yellow stripes. 

 Ovipositor entirely reddish-yellow, shining, with the basal segment swollen, about as 

 long as the last abdominal segment, but not much prominent. 



Type (J, type § and additional specimens of both sexes in the collection of the 

 Imperial Bureau, from Nyasaland, Chiromo, Ruo. R., 22. ix. 1916, collected by 

 R. C. Wood, in whose honour the species is named. 



5. Dacus hamatus, sp. nov. (fig. 4). 



A very distinct species, which in my key falls into section 25 (p. 90), but is dis- 

 tinguished from inornatus and from any other known species by the exceedingly 

 peculiar wing pattern, and by the longitudinal keel of the abdomen. 



(J$. Length of body, 6-6*5 mm. ; length of wing, 5-5*5 mm. 



Head entirely of a shining black colour, even on frons and face ; occiput with a 

 narrow and short, spot-like stripe on each side on the orbits ; frons with a pair of 

 yellow dots on the basal half ; lunula yellowish brown ; the frons shows anteriorly 

 a rounded prominence, which is peculiar to this species. Antennae dark yellowish, 

 with the two basal joints very short, the second with some black bristles above, 

 the third very elongate, blackish on the apical half ; palpi broad, of a reddish colour ; 

 proboscis black. Cephalic bristles black ; two pairs of distant lower fronto-orbitals. 

 Thorax entirely black, punctate, with a short dark pubescence on the back, which 

 is paler at the sides. The very striking yellow markings are as follows : a rounded 

 humeral spot, which covers only the hind half of the humeral calli ; the fore half 

 being black ; there is no sutural stripe, only the notopleural calli at the beginning 

 of the suture being yellow ; an oval spot in the middle line of the back, behind the 

 suture ; a broad mesopleural patch, extended on to the pteropleura and ending 

 with a small spot on upper border of sternopleura ; a single hypopleural spot 

 Mesophragma entirely black, punctate, a little shining. Halteres pale yellowish. 

 Scutellum yellow, with a narrow black base and with a pair of bristles. All the 

 bristles are black ; there is no trace of anterior supra-alars ; pteropleurals well 

 developed ; only the external scapulars are strong. Abdomen rounded, convex, 

 constricted at base ; along the middle line there is a very peculiar obtuse keel, which 

 on the middle segments is rather prominent; it is clothed with dark pubescence, 

 which at the sides of the base is greyish, erect and rather long. The abdomen is. 

 (C365\ e2 



