A Monograph of Egyplian Diplcra. 19 



'1-1 (23) Fions iiillatiHl (Tl. 1, lig. 11) 10 Lasiopiithicus. 



'1\\ C22) Frons normal. 



24 (25) 'J'iiorax proviùcd in front with a 

 distinct collar of liairs; ocrlli at sonic 

 distance froiii the vcrte.x 11 Asarcina.* 



2;") (24) Thorax witliout a distinct collar of 



hairs; occlli placcd ncar tlio vcrtex.. 12 Syrpiius. 



2() (15) Abdomen conspicuously constricted 

 ahont the base, tubular and club-shap- 

 ed; markings less well defincd 13 rsKi'DonOROG. 



27 (2) ]{adi!)-mcdiaii cross-vcin placcd afici' 



the middle of ocU M2. 



28 (35) Radius 4 + 5 looped cansing cell R5 lo 



bc remarkably contracted abolit the 



middle ■ (ERISTALIN-E) 



29 (30) Radius 1 unitod with Radius 2 + 3 at 



the end, (PI. I, tigs. 1, 2) 14 Eristalis. 



30 (29 Radius I .separated from Radius 2 + 3. . 



31 (32) lîind femora with a distinct tooth-like 



proccss beneath, near the apex 15 Merodon. * 



32 (31) Hind femora not toothed. 



33 (34) Eyes hairy 16 Myiatropa.* 



34 (33) Eyes bare 17 Helophilus. 



Suhgencra :^ 



1 (2) Eyes of maie almost 



touching Mesembrius. 



2 (1) Eyes of malc widely 



separated 



*So far not représentée! in Egypt. 



