DTTEHAM DIPTEEA. 25 1 



XXXIII. 450. 



34 (28) (33). Abdomen with four lateral angular spots. 



(1965. quadrinotata, Mg.) 



35 (27). Abdomen with only undefined spots and reflections. 



36 (41). Scutellum partly orange. 



37 (40). Antennal basal joints yellow. 



38 (39). Femora and tibiae all pale ; X-veins distinctly clouded. 



(1963. erratica, Fin.) 



39 (38). Fore femora with the base dark ; X-veins not or 



scarcely clouded. 



1 96 1. Hyedotesia signata, Mg. 

 Harperley, 1 $, June, 1902. 



40 (37). Antennae entirely black. 



i960. Hyedotesia errans, Mg. 

 Hesleden, 1 ?, August, 1902 ; Bedburn, 1 $, June, 

 1905. In the latter the humeri are orange. 



41 (36). Scutellum entirely black or grey. 



42 (48). Abdomen with a dark central stripe only. 



43 (44). Palpi pale. 



1967. Hyedotesia rufipalpis, Mcq. 

 South Durham, 1 $. 



44 (43). Palpi black. 



45 (46). Dorsum unstriped. (1966. boleticola, Rnd.) 



46 (45). Dorsum with black stripes. 



47 (48). Eyes of the male touching ; femora and tibiae all pale. 



(1964. basalts, Ztt.) 



48 (42) (47). Abdomen with dark tessellations besides the 



dark stripe ; eyes of the male slightly separated ; 

 fore femora partly dark. (vagans, Fin.) 



49 (26). Arista short haired, pubescent ; abdomen spotted. 



1962. Hyedotesia lasiophthalma, Mcq. 

 Hesleden, 2 $, Shipley, 1 ?, May- August, 1900. 



50 (25). At least the abdomen wholly or partly pale. 



51 (56). Abdomen only pale ; thorax grey, at most the humeri 



yellow. 



52 (55). Arista plumose. 



53 (54). Hinderside of mid tibiae with three bristles. 



(1969. scutellaris, Fin.) 



