DITOMYIA. 63 



Wings white-hyaline, the costal and two anterior veins light brown, 

 the posterior veins colourless ; the oblique transverse veinlet is about 

 as long as the apical portion of the first vein, which it intersects. Hal- 

 teres and legs dingy yellowish. Abdomen long ; the posterior segments 

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

 largely exserted, dingy yellow ; the terminal tentacles more dusky, two- 

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

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

 Hal. MSS. 



On short grass at Holywood, etc. In Mr. Haliday's collec- 

 tion. (I.) 



Genus XX. DITOMYIA. 



DITOMYIA, Winnertz, Exit. Zeit. Stett. vii. 14 (1846); Ruthe. Myce- 

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



Corpus elongatum, gracile. Caput parvum. Oculi rotundi, hemi- 

 spha3rici. Ocelli tres ; intermedius parvus, non antepositus. Palpi 

 biarticulati ; articulus primus crassus, ovatus; secundus oblongus. 

 Antennae 17 -articulates, compressee; articulus primus cyathiformis ; 

 secundus transversus ; sequentes ovato-cylindrici. Thorax ovatus. 

 Alee pilosce, mediocriter latas ; vena cubitalis furcaia. Halteres bre- 

 ves. Abdomen segmentis 7. Pedes longi, graciles, tibiae spinis mi- 

 nimis, calcaria mediocria. Mas. Abdomen lineare. Foem. Abdomen 

 apicem versus subdilatatum. 



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. Antennaa seventeen- 

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

 following ovate-cylindrical. Thorax oval. Wings 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 ; externo-medial nearer to the subapical than to 

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

 Halteres rather short. Abdomen long, slightly compressed. Legs 

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

 long spurs. Male. Abdomen linear. Fern. Abdomen slightly widened 

 towards the tip. 



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

 Boleti. 



1. fasciata, Meig. Z\v. i. 230. 2 (1818). Flava, antennis fuscis 

 basi flavis, thorace vittis tribus fuscis, alis subcinereis fasciis duabus 



