. Bee flies of the world: the genera of the family Bombyliidae. Bombyliidae; Parasites. BOMBYLIIDAE 51 21 22. 13 12 Text-Figure 11.—The wing of a generalized Recent bee fly, Disckistus mystax Wiedemann. Explanation: 1, costa; 2, subcosta or auxiliary vein; 3, first branch of the radius, or first longitudinal vien (Ri); 4, second longitudinal vein (R2 and R3); 5, third longitudinal vein (R4 and Rb); 6, anterior branch of third vein (Ri); 7, posterior branch of third vein (Rs); 8, first branch of medius or fourth vein (Mi); 9, second branch of fourth vein (Mj); 10, third branch of fourth vein, o

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. Bee flies of the world: the genera of the family Bombyliidae. Bombyliidae; Parasites. BOMBYLIIDAE 51 21 22. 13 12 Text-Figure 11.—The wing of a generalized Recent bee fly, Disckistus mystax Wiedemann. Explanation: 1, costa; 2, subcosta or auxiliary vein; 3, first branch of the radius, or first longitudinal vien (Ri); 4, second longitudinal vein (R2 and R3); 5, third longitudinal vein (R4 and Rb); 6, anterior branch of third vein (Ri); 7, posterior branch of third vein (Rs); 8, first branch of medius or fourth vein (Mi); 9, second branch of fourth vein (Mj); 10, third branch of fourth vein, or posterior intercalary vein (M3), with anterior branch of the cubitus; 11, ambient vein; 12, second branch of fifth vein (CU2); 13, sec- ond anal vein; 14, main stem of the radius (R); 15, main stem of the medius (M); 16, main stem of the cubitus (Cu); 17, first anal vein; 18, remnant of third anal vein; 19, anterior branch of cubitus; 20, radial sector; 21, arculus; 22, humeral crossvein; 23, anterior, small, or middle crossvein; 24, anterior intercalary vein; 25, lower branch of the medius; 26, first or basal costal cell; 27, costal cell; 28, subcostal or mediastinal cell; 29, marginal cell (Ri); 30, first submarginal cell (R2 and R3); 31, second submarginal cell; 32, first posterior cell; 33, second posterior cell; 34, third posterior cell; 35, fourth posterior cell; 36, third basal, anal or lower basal cell; 37, axillary cell, anal angle; 38, discal cell (1st M2); 39, second basal cell; 40, first basal cell; 41, alula, axillary or posterior lobe; 42, posterior, or medial crossvein. wing is tinged with gray or brown or yellow; many species in various genera have the wings spotted, banded, or fenestrate with odd windowlike spots, or are mottled and infuscated. The apex of the wing in certain species of CoTuxftosia Macquart may be milky white. The costal border at the base may or may not have a widened margin, may be with or without a bristly comb, and may or may not be pre