CECIDOMYIA. 121 



border, paler along the hind border. Halteres blackish-brown. Ab- 

 domen reddish. Oviduct not exserted. Legs blackish-brown, stout. 



The oviduct is retracted in the preceding species of this sub- 

 gentis ; in C. cornuta, Bremi, it is extended. 



138. Fagi, Hartig, Jahresberichte i. 4(1836); Loew; Winn. Ni- 

 gro-fusca, capite nigro, thorace trisulcato lateribus carneis, alls sublim- 

 pidis cinereo-pilosis, venis pallide fuscis, costa nigro-fusca, halteribus 

 fulvis, abdomine obscure carneo, femoribus basi flavescentibus ; Mas, an- 

 tennis 24-articulatis corpore longioribus, articulis longi-petiolatis ; Foem. 

 antennis articulis 20-22 non petiolatis, oviductu fulvo brevi lamellis 

 duabus rotundatis. Long. 2-2i lin. 



Blackish-brown. Head black. Thorax with three ftirrows, flesh- 

 colour on each side. Wings nearly limpid ; anal vein and its second 

 branches forming a slightly obtuse angle. Abdomen dull flesh-colour. 

 Femora yellowish at the base. Male. Antennae twenty-four-jointed, 

 longer by one-fourth than the body ; joints as long as their petioles. 

 Fern. Antennas twenty- to twenty-two-jointed, one-third of the length 

 of the body; joints not petiolated. Oviduct tawny, short, with two 

 round valves. 



Lives in the pyramidal galls on the leaves of Fagus sylvatica. 

 These occur in great numbers on the beech-trees near Interlacken, 

 in Switzerland, and are different from the slender horn-shaped 

 galls which appear on the beech-leaves near London. (E. ?) 



139. piligera, Loew, Pr. Pos. Gymn. 32. 6 (1850) ; Winn. an- 

 nulipes, Hartig. Nigro-fusca, palpis pallide fuscescentibus, antennis 

 17-20-articulatis fuscescentibus, thoracis lateribus abdomineque carneis, 

 alis limpidis cinereo-hirtis, venis fuscescentibus, costa nigro-fusca, hal- 

 teribus basi flavis, pedibus subtus albicantibus ; Mas, antennis corpore 

 paullo longioribus, articulis brevi-petiolatis ; Fcem. antennis corporis 

 dimidio non longioribus, articulis non petiolatis, oviductu elongate flavo 

 lamellis nullis. Long. 1^-1 J lin. 



Blackish-brown. Antennas with eighteen or twenty joints, rarely 

 with seventeen joints. Thorax on each side and abdomen flesh-colour. 

 Wings limpid ; anal vein and its second branch forming a slightly obtuse 

 angle. Male. Antennas a little longer than the body ; joints longer by 

 one-third than their petioles. Fern. Antennae as long as the head and 

 the thorax together ; joints not petiolated. Oviduct elongated, yellow, 

 without valves. 



Lives in hairy galls on the leaves of Fagus sylvatica. 



140. elegans, Winn. Linn. Ent. viii. 287. 76 (1853). Mas, nigra, 

 nitida, antennis 20-articulatis fuscis corpore paullo brevioribus, arti- 

 culis longi-petiolatis, thoracis lateribus carneis, alis subcinereis cinereo- 

 pilosis, venis fuscis, halteribus basi albis, abdomine nigro-fusco incisuris 

 albis, pedibus subtus vix albicantibus. Long. 1 lin. 



Male. Black, shining. Antennae twenty-jointed, brown, shorter by 



VOL. IV. R 



