37° DURHAM DIPTERA. 



LI. 637. 



57 (58). Scutellum black, yellow in the middle ; dorsum nearly 



smooth. {scutellaris, Ztt.) 



58 (57). Scutellum yellow, with only a trace of a brown spot 



on each side of the base ; dorsum coarsely 

 punctate. 



2706. Chlorops puncticollis, Stseg. 

 Bishop Auckland, 1 ?, July, 1901. 



59 (54). Scutellum dark or black. 



60 (63). Antennae black. 



61 (62). X-veins close together, almost perpendicular ; arista 



white ; frons yellow. 



(2702. Diplotaxa messoria, Fin.) 



62 (61). X-veins not in a line ; V.4 3 about three times V.4 2 ; 



entirely black except the tarsi ; frons all black. 



Haplegis, Lw. (634) 



63 (60). Antenna? orange ; head reddish white. 



(Diplotoxa erythrocephala, Ztt.) 



638. Chloropisca, Lw. (see also page 366). 



1 (2). Jowls small; eyes large. ornata, Mg. (2714) 



2 (1). Jowls broad. 



3 (6). The upper mouth edge (clypeus) black. 



4 (5). Legs dark. (obscurella, Ztt.) 



5 (4). Legs pale. ( 2 7 J 5- glabra, Mg.) 



6 (3). Upper mouth edge not darkened. 



7 (8). Jowls exceedingly broad ; X.4. and X.5. rather near 



together. (trifasciata, Ztt.) 



8 (7). Jowls and X-veins normal. (rufa, Mcq.) 



639. Oscinis, Ltr. 



1 (17). Antennse all black. 



2 (12). Body and head entirely black. 



3 (9). Arista black. 



4 (5). Legs all yellow. (atricornis, Ztt.) 



5 (4). Legs at least partly black. 



6 (7) (8). Legs all black except the joints. {atricilla, Ztt.) 



