96 STRATIOMYIDJ:. 



Subfamily XYLOMYIN^. 



Head with eyes separated iu both sexex ; face depressed in 

 middle ; palpi elongate and upturned ; antennal 3rd joint elongate, 

 with eight annulations and generally a minute apical bristle. 

 Thorax practically bare, subquadrate ; scutellum unspined. Abdo- 

 men of 7 to 9 segments, elongate, longer than thorax, with nearly 

 parallel sides ; genitalia of d conspicuous. Legs moderately long 

 and stout, bare or nearly so, hind femora often incrassate or 

 spinose below ; posterior tibiae with two spurs. Wings not of 

 the normal Stratiomyid type, all the veins reaching wing-margin, 

 the anterior veins not crowded together ; 2nd vein (praefurca) 

 originating some distance before base of discal cell, the latter 

 much more elongate than in any other subfamily ; costal vein 

 complete, ambient vein present for at least some further distance ; 

 3rd vein with an elongate fork, lower branch ending at about 

 wing-tip ; 4th vein with three terminations ; 4th posterior cell 

 closed near wing-border, a special character of this subfamily ; 

 five posterior cells ; posterior cross- vein normally present, but in 

 some species the contact of upper branch of 5th vein with discal 

 cell is practically punctiform, in which case cross-vein absent ; 

 alar squama? very small, thoracic squamae absent. 



The XYLOMYIN^ resemble the BERINJG more than any other sub- 

 family, and the principal distinguishing characters are given under 

 BEHIND. Further characters of the XYLOMYI^^E are the depressed 

 face, the much more elongate discal cell, the unspined scutellum, 

 the non-metallic or aeneous nature of the species, and the undilated 

 metatarsus in the <S They are mostly yellow, somewhat Ichneu- 

 mon-like flies, and sparsely pubescent. 



Genus XYLOMYIA, Rond. 



Xylomya, Roiidani, Dipt. Ital. Prod, iv, p. 11 (1861). 

 Siibula, Megerle in Meigen, Syst. Besch. ii, p. 15 (1820). 

 Solva, Walker, Proc. Linn. Soc. Loud, iv, p. 98 (1860). 

 Macroceromys, Bi<rot,Bull. Soc. Ent. France, (o) vii, p. Ixxiii (1877). 

 Subulaomyia, Williston, Mail. N. Amer. Dipt. p. 43 (1896). 

 Xylomyia, de Meijere, Tijd. v. Ent. i, p. 217 (1907). 



GENOTYPE, Xylomyia is a uom. nov. for Subula, Mg., of which 

 Eondani gave varia, Meg. in Mg., as type. 



Head transverse, as wide as thorax ; frons flush with eyes or 

 slightly depressed ; face distinctly depressed about the middle ; 



Fig. l.Xyloiiiyiu, antenna. 



eyes bare, well separated in <$ , still more so in $ ; proboscis 

 prominent ; palpi 2-jointed, cylindrical, rather long, directed 

 upwards. Antennae elongate, as long as or longer than liead ; first 



