.1 Monogra[)h o/ Egyptian Diptera. 83 



racteristic de; in addition tliere is a small black spot iinmediately 

 above the wing base; pleurae entirely pale yellow; ali the bristles are 

 blauk and the 7npl. is aeconipanied by some pale bristly hairs; tlie 

 pubescence on the dise is pale yellow and consists of rather thick 

 but short hairs; scutellum yellow with three characteristic black 

 siDOts, one on each side of the base and one at the apex. 



Abdomen reddish to brownish-yellow with four transversy 

 rows of blaek rounded spots, each row consisting of five spots and 

 situated at the upper margin of each abdominal segment; two of 

 thèse rows are situated one on each side of the latéral margins and 

 the two others one on each side of the central line; ovipositor red- 

 dish-yellow, flattened and about as long as the three apical seg- 

 ments together. 



Legs entirely yellow; front femora with a row of bristles 

 beneath; middle tibiae with a single spur; hiud tibiae with a row of 

 much weaker bristles on the outer side. 



Wings hyaline with four transverse yellow bands, which are 

 united at the upper margin and appearing somewhat as deep inden- 

 tations; the first band covers the base of the wing and extends 

 downwards covering the M cell, (except for one hyaline spot always 

 présent in this cell) Cu cell and Cu2-i-A2 but not quite reaching 

 the lower margin, and leaving the allula hyaline; the second ban(l 

 is situated below RI, covering the radio-median cross-vein and 

 reaching to the lower margin; the third band is parallel with the 

 second, covering the médian cross-vein and also reaching to the lower 

 margin; the fourth band is usually much darker in colour, oblique 

 and covers the apices of R4 + 5 and Ml; the margins of thèse bands 

 or indentations are bordered with brown; the union of thèse yellow 

 bands on the upper margin entirely covers the costal cells, the ^r. 

 cell, the stigma, RI cell and almost ail R3 cell; the ba.sal h;df of the 

 stigma however is lighter than the apical half and there are usually 

 two small, pale hyaline spots in RI, touching the costa, the first of 

 which is situated immediately after the stigma and the second above 

 the médian cro.ss-vein; costal bristle double; R2 + 3 and R4 + 5 un- 

 dulated and not parallel; radio-median cross-vein i)laced at the 

 middle of Ist M2 cell; inferior angle of Cu cell drawn int(i a long 

 and pointed angle but shorter than M. cell. 



T. jaccae is quite eommon in Egypt especially in localitie-! 

 where its food plant, Centaurea fallescens grows. 



Frauer.feld in 1x02 had bred one spécimen in Europe from the 

 head of Centdiirca scabios». I hâve captured this species commonly 

 in the Mariout district, Cairo and its neighbourhoods, Alexandria 

 and in the Wadi Hoff . I hâve also seen spécimens from Mazghouna 



