.4 Mohograph of Égyptian Diptera. 



wing and well in front of tlie radio-median cross-vein ;R2 + :■} straight ; 

 R4 + 5 bare; Ml a little undulated; radio-median eross-vein perpen- 

 dicular, placed ne;u- tlie apical fourth of Ist M2 cell, ils distance 

 from the médian cross-vein iisually equal to its length ; inferior angle 

 of Cu eell short and broad, usually shorter than M cell. Wing pattern 

 very characteristie, black with deep hyaline indentations, especial- 

 ly at the hind margin, or in other words, hyaline with four black 

 bands iinited together at the upper margin except for a short dis- 

 tance towards the middle. 



TYPE : Tnji)(:-t(i t/iindri/irisa WlEDEMANN (1824). 



Apparently only two species of this interesting genus were 

 known in the palaearctic région, quadrincisa, Wied, and sexmacii- 

 lata Macq., which hâve a very wide distribution in South Europe, 

 Africa, Asia and India. The two following Egyptian species do not 

 correspond with the descriptions of the two previously known species 

 and are consequently an important and interesting addition to the 

 genus as well as to our Fauna. I hâve in addition the valuable con- 

 firmation of Prof. Bezzi's opinion on this point. One species differs 

 from the original description of the genus by possessing only two 

 scutellar bristles instead of four. I hâve named this after Dr. Br. 

 Debski who first found one of the two native species in 1908 and 

 who bred two adults from the inflorescence of Stachys aecjyptinea. 

 The larvae live in the floral buds of this plant and feed on the co- 

 rolla and essential organs of the flowers. Larvae and pupae were 

 found on April 14th, 1908 and the latter hatched on April 20th 

 1908. 



Unfortunately both imagines had been lost before I had the 

 chance of examining them so that it is not possible to state which of 

 thèse two species was in his possession. 



The two Egyptian species seem to be flower-head feeders, as I 

 hâve bred S. negyptiaca from the floral spikes of Lartnidiila coro- 

 nopifolia from the Wadi Hoff . 



TABLE OF EGYPTIAN SPECIES 



1 (2) Scutellum with two bristles; head very 



dark; hind tibiae with more than their 



basai halves black i S. debskii, Effi.at. 



2 (1) Scutellum with four bristles; head yel- 



low; hind tibiae entirely yellow 2 S. aegyptiaoa, Effi.at. 



