DURHAM DIPTERA. 363 



LI. 634. 

 634. Haplegis, Lw. 



1 (4). Frons entirely black. 



2 (3). V.3. and V.4. almost parallel. (2698. tarsata, Fin.) 



3 (2). V.3. and V.4. very divergent. (2699. divergens, Lw.) 



4 (1). Frons red in front. (2700. rufifrons, Lw.) 



635. Eutropha, Lw. 



1 (4). Thorax and scutellum entirely shining black. 



2 (3). V.3. and V.4. parallel. {ingrata, Lw.) 



3 (2). V.3. and V.4. very divergent. (2701. fulvifrons, Hal.) 



4 (1). Thorax and scutellum black and yellow. 



5 (6). Dorsum black with yellow spots in front and at the 



sides ; abdomen dark brown. {yariegata, Lw.) 



6 (5). Dorsum yellow with black stripes ; abdomen with 



four stripes of yellow spots. (maculata, Lw.) 



636. Diplotoxa, Lw. (see also page 365). 



1 (4). C 2 as long as, or shorter than C 3 . 



2 (3). The scutellum wholly and the legs partly black. 



(2702. messoria, Fin.) 



3 (2). The scutellum and legs all dark yellow. 



{approxiniatonervis, Ztt.) 



4 (1). C 2 much longer than C 3 . 



5 (6). Abdomen with black hairs all over, (inconstans, Lw.) 



6 (5). The hairs of the abdomen white except on the 



middle. {albipila, Lw.) 



637. Chlorops, Mg. (see also page 365). 



1 (2). Dorsum coarsely punctate, and with the exception of 



the side margins black. puncticollis, Ztt. (2706) 



2 (1). Dorsum yellow with black stripes, which are some- 



times run together, seldom with red or partly red 



stripes. 

 8 (6). Wings distinctly brownish. 



4 (5). Costa reaching beyond the end of V.3.; palpi small. 



(2703. meigenii, Lw.) 



