.1 Monograph o/ Egyptian Diptera. 33^ 



half of the second and the ai)ital tliird oi' the third segments pale 

 yellow ; often also the lower margius of the fourth and f ifth segments 

 are paler but this is ehiefly due to a minute white pulverulenee pré- 

 sent on the lower halves of the four apical segments and whieh gives 

 the abdomen a characteristic grey banded appearance in certain 

 lights; pubescence uniformly fine and shining white; female ovi- 

 positor cylindrical, reddish-yellow, shining and with the basai seg- 

 ment at least as long as the whole of the abdomen. 



Legs yellow to pale yellow but with the apices of the femora 

 darker, especially the hincî femora ; middle tibiae with one large and 

 a second much smaller spur. 



Wings hyaline with ail the veins yellow and with a character- 

 istic brown spot at the apex of the undulated R4 -^ 5 ; the stigma , sub- 

 costa and cells RI and R3 are yellow; there is also a very diffuse, 

 indistinct brownish spot in Ist M2 cell, below the radio-median cross- 

 vein. 



D. longistyhis, var. nov. clanis (PI. II fig. 2) 



This variety is distinguished by the entirely yellow frons and 

 antennae and by the gênerai colour which is lighter, especially on the 

 dise of the thorax where the ground colour is paler, hence the insect 

 ha s a yellow appearance. 



D loïKjistyliis is found in Upper Egypt ouly, where 

 it is very comm.on wherever its food plant Calotroph procera 

 grows. The larvae iive in the fruits feeding on the seeds — and the 

 adults run about on the leaves and fruits in the sunshine. I hâve 

 captured it in Asswan and Kom-Ombo on C . procera only and havo 

 also bred it from larvae living in the fruits of that plant from the 

 same localities, in January 1923. 



The var. clarus however is so far known from Kharga Oasis 

 only. I hâve before me 12 spécimens of D. longistylvs^ originating 

 from the above locality, belonging to the collection of the Ministry 

 of Agriculture and captured by Dr. L. H. Gough on 12.9.1917. 

 5 of thèse (2 cf and 3 9) are var. Clurus and the other 7 typical 

 D. long i Stylus. 



DACUS ANNULATUS Becker 

 (PI. II fig. 5) 



Beck., Mitteil. Zool. Mus. Berlin. IT. 13S. 224 (1903). 



DIA GNOSIS.— A small dark rusty brown alniost black- 

 species with pale yellow legs and a short cylindrical ovipositor. 



Mémoires de la Soc. Roy. Eut. d'Egyptt 3 



