DITOMYIA. 63 



Wings wliite-hyaline, the costnl and two anterior veins light brown, 

 the posterior veins colourless ; the oblique transverse veinlet is about 

 as lon<^' as the apical portion of the first vein, which it intersects. Hal- 

 tercs and legs diugv yellowish. Abdomen long; the posterior segments 

 in the female not so much attenuated as usual ; the eighth and ninth 

 bwgely exserteil, dingy yellow ; the terminal tentacles more dusky, two- 

 jointed ; the second joint smaller, orbiculate ; beneath tliera a compressed 

 obtuse process nearly as long. The forceps of the male unguiculate." 

 -llal. MSS. 



Oil short grass at'Ilolywood, etc. In Mr. Ilaliday's collec- 

 tion. (I.) 



Genus XX. DITOMYIA. 



DiTOMYiA, Winnertz, Ent. Zeit. Stett. vii. 14 (1846) ; Kuthe. Myce- 

 tobia p., Meig. ; Stseg. ; Mcq. Sijimnerus, Walk. 



Corpus elongatura, gracile. Caput parvimi. Oculi rotundi, hemi- 

 sphfierici. Ocelli tres ; intermedins parvus, non antepositus. Palpi 

 i)iartieulati ; articulus primus crassus, ovatus ; secundus oblongus. 

 Antenna} 17-articidat3e, compressie ; articuUis primus cyathiformis ; 

 secundus transversus; sequeutes ovato-cyliudriei. Thorax ovatus. 

 Ala pilosa, mediocriter latse ; vena cubilaUs fiircala. Halteres bre- 

 ves. Abdomen segmentis 7. Pedes longi, graeiles, tibia spinis mi- 

 nimis, calcaria mediocria. Mas. Abdomen lineare. F(£m. Abdomen 

 apieem versus subcUlatatum. 



Body long, slender. Head small. Eyes round. Ocelli three, the 

 middle one small, in a straight line with the others. Palpi with two 

 joints ; the first thick, oval ; the second oblong. AntenuiE scventeen- 

 jointed, compressed ; first joint cyathiform ; second transverse ; the 

 following ovate-cylindrical, Thorax oval. TVhujs pilose, moderately 

 broad; subcostal vein rudimentary ; radial ending at about four-fifths 

 of the length; cubital forked before the end of the radial, its fore fork 

 rather long, ending at some distance beyond the radial ; hind fork end- 

 ing at the tip of the wing; subapical emerging from the cubital at be- 

 fore the connection of the latter with the radial, forked at a little before 

 one-third of its length ; cxterno-mcdial nearer to the subapical than to 

 the subanal, which is curved hiiulward ; anal extending to the border. 

 Halteres rather short. Abdomen long, slightly compressed. Legs 

 long ; tibia icilh very minute spines, armed at the tips with moderately 

 long sptirs. Male. Abdomen linear. Fem. Abdomen slightly wid(;ncd 

 towards the tip. 



This genus is nearly allied to Vlatjjura ; the larvse feed on 

 Boleti. 



I. fasciata, Meig. Zw. i. 230. 2 (1818). Flava, antcnnis fuscis 

 basi ilavis, thorace vittis tribus fuscis, alis suljcinereis faiciis dual/us 



