. Diptera Brachycera. Brachycera. Disciiisi'us.—srsTCECiius. 275 shanks ; feet piceous; wings colourless, dark brown at the base and slightly so along the fore borders ; the border of this brown is very obhque, and it slants towards tlie hinder base of the wing; its outskirts are confined to the sides of the cross-veins; Ming-ribs and veins piceous ; poisers tawny. " Length of the body 3 lines, of the wing^ 7 lines. East ; T>ipe in the British 3[nseum. Genus SYSTCECHUS, Lw. Srjstachus, Loew, Neue Beitr. iii, p. M (18oo). Genotype, Bomhyllus sulphureus, Mikan (Europe); by Co
. Diptera Brachycera. Brachycera. Disciiisi'us.—srsTCECiius. 275 shanks ; feet piceous; wings colourless, dark brown at the base and slightly so along the fore borders ; the border of this brown is very obhque, and it slants towards tlie hinder base of the wing; its outskirts are confined to the sides of the cross-veins; Ming-ribs and veins piceous ; poisers tawny. " Length of the body 3 lines, of the wing^ 7 lines. East ; T>ipe in the British 3[nseum. Genus SYSTCECHUS, Lw. Srjstachus, Loew, Neue Beitr. iii, p. M (18oo). Genotype, Bomhyllus sulphureus, Mikan (Europe); by Coquil- lett's designation (1910). This genus differs from Bomhylias chiefly by the tw^o basal cells being practically equal in length, owing to the position of the anterior cross-vein near the base of the discal cell. Eyes in d" sometimes separated by a narrow frons. Tip of 3rd antenna I joint without the small obvious style present in Bomht/lms. Pubescence of abdomen said to be longer and more ragged'than in Bomh)/lius* Kange. Fig. 16.—Sjjstoechu^, Lw., wing. Life-Jtistori/. The early stages of S. autmnnalls and S. oreas, a European and North American species respectively, have been observed by Portchinsky and by liiley. The larvas live in the egg-cases of locusts ; they are whitish, cylindrical, amphipneustic, and 13-segmented, much as in Bomhyllus. The pupae also resemble those of that genus. Tahle of Species. 1. Legs with at least femora black ; abdomi- nal spines black '2. Legs wholly or principally yellow .'3. '2. Pubescence pale to bright yellow socius, Walk., p. 27(1 Pubescence nearly white nivalis, Brim., p. 277. .J. First and 2nd antennal joints brownish yellow; femora and tibi;e wliollybright brownish yellon ; abdominal spines [p. 277. yellow Jlavospiiiosas, sp. n., Anteniue all black ; femora brownisii. .. eitpoffonalus, Big., p. 27H. * This is so in many species ; I cannot vouch personally lor the constancy of the character. t2. Please note tha
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1920, bookyear1920
