XYLOTA, 231 



Genus XYLOTA, Melg* 



Xylota, Meigen, Syst. Beschr. iii, p. 211 (1822). 

 lieliophilus, Meigen, Illig. Mag. ii, p. 273 (1803). 

 JEumerof, Meigeu, loc. cit. 

 Eumerus, Meigen, Klass. i, p. xx (1804). 



Micntptoma, Westwood, Introd. Class. Ins. ii, Synops., p. 136 

 (1840). 



Gexotype, Musca segnis, L., by designation of Curtis, Brit. Eut., 

 1832. 



Head generally slightly broader thau thorax ; eyes bare, con- 

 tiguous in 6 , widely separated in $ ; face hollowed below the 

 moderate aiitennal prominence, upper mouth-edge distinctly 

 produced, central knob absent ; antennae with 3rd joint rather 

 large, round or oval, arista bare, sub-basal. Thorax oblong, fairly 

 arched, aeneous ; scutelium ooncolorous ; both finely pubesceut. 

 Abdomen narrower and much longer than thorax, rather flat, 

 with nearly parallel sides. Legs strong; hind femora more or 

 less thickened or lengthened, generally serrulate below; hind 

 trochanters of c? often with a process or spine below ; hind tibia? 

 more or less curved, sometimes ending in a distinct spur. JTrngs 

 with the venation of the Milesiix.e ; marginal cell open ; 3rd vein 

 nearly straight; anterior cross-vein at or beyond middle of discal 

 cell, very oblique. 



Life-history. The earlier stages of some European species are 

 fairly well known, the larvae living in rotting wood. See Lundbeck, 

 Diptera Danica, v, p. 509 (191G). 



Mange. Europe, Xorth-East Asia, Orient, Xorth and South 

 America, Australia. 



Table of Species. 



1. Wings witli about apical half blackish .... dimidiata, s^. w.,^.'2Z2. 

 Wiugs uniformly greyish or yellowish-grey . 2. 



2. Femora mainly or wliolly orange ; anterior 



pairs always wliolly so 3. 



Femora mainly or wholly black 6. _ [p. 233. 



3. Hind femora black except broadly at tip . . cupreiventris, sp. n., 

 Hind femora orange, with a broad black 



median ring, and the tip black aumdata, Bruu., p. 234. 



Hind femora almost entirely orange 4. 



4. Abdomen witli definite, yellow spots ornafa, Brun., p. 23G. 



Abdomen without detinite spots '"3. 



5. Hind fi'niora almost wlioily orange, a 



blackisli median streak above; anlounal 



prominence shorter ; thorax with anterior 



part bearing golden-yellow jiubescence 



which is absent in the median line, giving 



the impression of a single longitudinal dark 



stripe ; more robust species ; abdomen _ [p- -'J' 



violet-tinged assametm's, Brun., 



* For a table of the Oriental speciea, seo Urunetti, Rec. liul. ilus. ii, p. 7U 

 (1908). 



