DURHAM DIFTERA. 377 



LIV. 653. 



18 (17) (21). Legs black ; femora and knees and fore coxae 



yellow. 



19 (20). Scutellum yellow. 



2763. Phytomyza notata, Mg. 

 Bishop Auckland, 2 $, May, 1900. 



20 (19). Scutellum grey. (2766. zetterstedtii, Schin.) 



21 (17) (18). Legs entirely black with at most the knees pale ; 



antennae black ; dorsum and scutellum grey. 



654. Chromatomyia, Hardy. 



22 (23). Abdomen black with yellowish white incisions on 



every ring. (2774. affinis, Mg.) 



28 (22). Abdomen black with at most the last ring pale 



edged ; dorsum with pale side stripes. 



(2775. albtcep, Mg.) 



Family LV.— ASTIAD^. 

 Life history unknown. 



655. Astia, Mg. 



1 (2). Dorsum shining black, with the edge and the pleurae 



yellowish white ; abdomen all yellow. 



(2778. concinna, Mg.) 



2 (1). Dorsum black with yellow side spots behind ; pleurae 



yellow with two shining black spots ; abdomen 

 with black spots and stripes. (2779. amcena, Mg.) 



Family LVL— BORBORID^. 



TABLE OF GENERA. 



1 (2) (3). V.4. distinctly reaching the wing margin; V.5. 



ending at or very slightly beyond X.5 2 , and not 

 reaching the margin (VII. 27) ; X.5 1 and X.6. 

 distinctly present; scutellar bristles present. 



Borborus, Mg. (656) 



2 (1) (3). V.4. and V.5. both reaching the margin; X.5 1 and 



X.6. distinctly present ; scutellum without bristles, 



though sometimes toothed. 



Spilerocera, Ltr. (657) 



