DUKHAM DIPTERA. 1 77 



XXVIII. 278. 



34 (33). Pubescence on the thorax moderately short. (May 



be fraterna or bergenstammt, 43 below, in which 

 the scutellar bristles are not very conspicuous). 



35 (32). Wings clouded, especially about the X-veins. 



(1469. nebulosa, Verr.) 



36 (27). Edge of scutellum with long black bristles. 



37 (40). Legs black, at most the middle joints of the fore and 



mid tarsi pale. 



38 (39). Legs entirely black. 



1470. Chilosia inipressa, Lw. 

 Hesleden, 1 $, 21-8-99. 



39 (38). Fore tarsi with the middle joints pale. 



147 1. Chilosia albitarsis, Mg. 



Common everywhere in spring on Ranunculus, &c. 



40 (37). Legs with at least the tibiae pale at both ends. 



41 (46). Tibiae and tarsi more orange than black. 



42 (45). Size 8-10 mm. Basal joints of fore tarsi pale. 



43 (44). Hind tibiae all orange ; tarsi darkened above. 



1472. Chilosia fraterna, Mg. 

 Gibbsnees, 1 $, 4-6-97. 



44 (43). Hind tibiae with distinct blackish ring ; tarsi con- 



siderably orange. (i473- bergenstammt, Beck.) 



45 (42). Size 7 mm. Basal joint of fore and mid tarsi dark, 



the three middle joints pale. (1474. prcecox, Ztt.) 



46 (41). Tibiae more black than orange. 



47 (48). Fore and mid tarsi orange on the middle joints. 



Size 6 mm. (1475. ttiutabilis, Fin.) 



48 (47). Fore and mid tarsi blackish, unless at the base. 



49 (50). Size 5J mm. 



1476. Chilosia v emails, Fin. 

 Hesleden, 3 $, 4-8-99. 



50 (49). Size 8 mm. 



51 (52). Abdomen with a distinct patch of black hairs at the 



hind corners of the fourth segment. 



1477. Chilosia firoxima, Ztt. 

 Hesleden, 1 $, 18-8-99. 



L 



