120 DURHAM DIPTERA. 



XXIII. 195. 



29 (28). Wings quite clear in the male. Brownish about the 



stigma in the female. Fore metatarsi scarcely 

 thickened in the male. (1054. interstincta, Fin.) 



30 (14) (24£) (25). Dorsum with four stripes. 



1064. Hilara quadrivittata, Mg. 

 Bishop Auckland, 1 ?, June, 1901. 



31 (1). Dorsum yellow. 



32 (33). Entirely yellow species with white dusting. Size, 



2-2J mm. (1072. tenella, Fin.) 



33 (32). Thorax yellow with pale stripes. Abdomen dark 



brown. 



1074. Hilara thoracica, Mcq. 

 Bishop Auckland, 2 % June, 1901 ; Hesleden, 2 $, 

 August, 1902. 



197. Trichina, Mg. 



1 (2). Wings brownish, hind tibiae club-shaped. 



(1076. clavipes, Mg.) 



2 (1). Wings clear, hind tibiae normal. (1077. flavipes, Mcq.) 



198. Microphorus, Mcq. 



1 (2). Hind tibiae and metatarsi much dilated. 



(1079. anomalus, Mg.) 



2 (1). Hind tibiae and metatarsi normal. 



1080. Microphorus velutimis, Mcq. 

 Wynyard, 1 $, May, 1902. 



199. CEdalea, Mg. 



Life history unknown. 



1 (4). Wings quite clear. Halteres pale yellow, at least the 



fore tibiae yellow. 



2 (3). Hind femora with the end portion black. 



(1082. stigmatella, Ztt.) 



3 (2). Hind femora entirely yellow. (108 1. flavipes, Ztt.) 



4 (1). Wings smoky, halteres dark, all tibiae black. 



1083. CEdalea hohngreni, Ztt. 

 Bishop Auckland, 2 $, June, 1901. 



