302 DURHAM DIPXERA. 



XXXIV. 490. 



7 (8), Abdomen strongly orange dusted ; anus of the male 



orange ; dorsum with two dark lines ; no stripe on 

 the hind femora. {armipes, Mg.) 



8 (7). Abdomen somewhat grey dusted ; dorsum unstriped 



hind femora with a sharply bounded black stripe 

 on the upper side. {striolata, Mg.) 



.9 (4). Dorsum orange, sometimes with black stripes. 



10 (13). Dorsum striped. 



11 (12). Dorsum with two very broad central stripes and two 



side stripes ; dorso-central bristles 3-4 ; . wings 

 clouded at the tip. (alpestris, Schin.) 



12 (11). Dorsum with two very narrow central stripes ; dorso- 



central bristles five ; tip of the wing not clouded. 

 2210. Norellia spinimana, Fin. 

 Hesleden, 2 $, 3 ?, August, 1900 ; Wearhead, 1 $, 

 August, 1 90 1. 



13(10). Dorsum unstriped ; mid femora and mid tibiae with 



unusually long white hairs. 



(2210. flavicauda, Mg.) 



14 (1). Arista slightly pubescent. 



15 (16) (17). Thorax and abdomen blackish with brown-grey 



dusting ; face white ; frons and antennae and legs 

 orange ; fore apical region of the wing clouded. 



(221 1. liturata, Mg.) 



16 (15) (1 7). Thorax and scutellum blue-grey dusted ; abdomen 



shining black ; head, proboscis, palpi, antennae, 

 and legs light yellow ; wings and veins yellowish. 



(2212. spinigera, Ztt.) 



17 (15) (16). Thorax and abdomen mouse coloured; humeri 



and tip of scutellum yellowish ; head, antennae, 

 palpi, proboscis, and legs yellow; wings yellowish. 



(lesgice, Beck.) 



493. Microprosopa, Beck. 



1 (2) (3). Abdomen shining yellow. 



(2216. heteromyzina, Ztt.) 



2 (1) (3). Abdomen brown with black hairs, {frontata, Ztt., $) 



