CECIDOMYIA. 79 



transverse veinlet very pale at the middle of the subcostal vein ; cubital 

 vein curved, ending near the tip of the wing ; first branch of the anal 

 curved to the hind border. Male. Antennae as long as the body ; joints 

 as long as their petioles. Fern. Antennas half the length of the body ; 

 oviduct very long ; third segment and hind half of the second yellow. 

 Lives in decayed beech-wood. 



6. riparia, Winn. Linn. Ent. viii. 218. 5 (1853). Fusca, facie 

 fulva, palpis albidis, antennis 15-16-articulatis, thoracis lateribus car- 

 ueis, alis limpidis, halteribus flavo-fuscis, abdomine fulvo, pedibus nigris 

 subtus albidis. Long. |J lin. 



Brown. Wings whitish in some aspects, with blackish-gvey down ; 

 veins brown ; transverse veinlet very slight and indistinct, situate beyond 

 the middle of the subcostal vein ; cubital vein ending at some little 

 distance from the tip of the wing ; second branch of the anal curved 

 abruptly and slightly obliquely to the hind border. Male. Antennas 

 fifteen to sixteen-jointed ; joints towards the base as long as their pe- 

 tioles, rather shorter towards their tips ; cubital vein hardly curved. 

 Fern. Antennas fifteen-jointed ; cubital vein distinctly curved. Oviduct 

 elongated, without valves ; second and third joints yellow. 



Inhabits the male blossoms of Carex riparia. 



1. Persicarise, L. S. N. ii. 977. 49 (1767); F. ; Gmel. ; Schr.; 

 Loew ; Winn. Foem. nigra, facie fronteque fulvis, palpis albido-flavis, 

 antennis 16-articulatis fuscis basi flavis, thorace nigro-cinereo vittis 

 quatuor nigris, alis vix subcinereis venis nigris, abdomine carneo fasciis 

 nigris, femoribus subtus albo-micantibus. Long. 1 lin. 



Fern. Black. Front and face tawny. Palpi whitish-yellow. An- 

 tennas sixteen-jointed, brown, yellow at the base, half the length of the 

 body. Thorax blackish-grey, with deep black stripes in the middle and 

 one on each side. Wings almost limpid, with black down and veins ; 

 costa and hind border stout and. black, the latter with a very broad 

 fringe ; transverse veinlet distinct, situate at about the middle of the 

 subcostal vein; cubital straight, ending at some little distance from 

 the tip of the wing; second branch of the anal curved to the hind 

 border. Halteres whitish -yellow at the base. Abdomen flesh-colour, 

 with black hairy bands. Oviduct elongated, without valves, yellow 

 towards the tip. 



Infests the leaves of Polygonum ampJiibmm. 



8. marginem-torquens, Bremi, Denkschriften der Schweizer- 

 ischen Gesellschaft fur Naturwissenchaften, pi. 2. f. 32, 33 (1847); 

 Winn. Hardy, Scot. Gard. iii. 78 (1854). Nigra, albo-hirta, facie 

 ihoracis lateribus scutello et metathorace fulvis, palpis albidis, antennis 

 pallide fuscis 15-16-articulatis, alis subcinereis venis fuscis costa valida 

 nigra, abdomine sordide ilavo (in mortuis obscuriore), pedibus nigro- 

 fuscis subtus albis. Long, i- f lin. 



Black. Sides of the thorax, scutellum, and metatJiorax tawny. Wings 

 with blackish-grey down ; transverse veinlet very pale, situate in the 



