DURHAM DIPTERA. 375 



LIII. 649. 



3 (4). Frons with two black stripes. (2747. puncticornis, Mg.) 



4 (3). Frons unstriped, or at most with quite indistinct lines 



near the eyes. ( 2 75°- annulipes, Ztt.) 



650. Ochthiphila, Fin. 

 Life history unknown. 



1 (2). Frons very broad, with a black band across the 



middle; frontal bristles only reaching to the 

 middle. (2756. spectabilis, Lw.) 



2 (1). Frons moderately broad, not banded ; frontal bristles 



reaching to the antennae. 



3 (6). Antenna? not entirely black. 



4 (5). Antenna? all yellow, often darkened. 



2755. Ochthiphila flavipalpis, Hal. 

 Hesleden, 6 $ and 6 ?, August, 1902. 



5 (4). Antenna? black, only yellow on the middle. 



2751. Ochthiphila polystigma, Mg. 

 Bollihope, 1 ?, June, 1901. 



6 (3). Antennae entirely black. 



7 (8). Tibia? broadly black on the middle. 



(2754. geniculata, Hal.) 



8 (7). Tibia? all yellow. 



9 (10). Abdomen with black spots. (2752. juncorum, Fin.) 

 10 (9). Abdomen unspotted. ( 2 753- aridella, Fin.) 



651. Schcenomyza, Hal. 



1 (2). Abdomen grey with brown bands. 



(2757. litorella, Fin.) 



2 (1). Abdomen with three shining black bands. 



(2758. fasciata, Mg.) 



Family LIV.— PHYTOMYZID^E. 



The larva? are leaf-miners, said to pupate in two forms, 

 namely, a barrel-shaped pupa beneath the epidermis of a leaf 

 and a potato-like pupa in the earth. 



TABLE OF GENERA AND SPECIES. 



1 (4). X.5 1 and X.5 2 both present; X.4. and X.5 2 in a line. 



