124 CECIDOMYZID^E. 



Lives on Poa nemoralis, and forms oval, rough galls, in which 

 it assumes the winged state. 



C. amcena, Loew, and C. gibbet,, Zett., also belong to the Subge- 

 nus Hormomyia. 



146. angustipennis, Winn. Linn. Ent. viii. 293. 82 (1853). 

 Fcem. flava, antennis fuscis basi flavis 13-articulatis corporis longitu- 

 dine, articulis mediocriter petiolatis, thorace vittis tribus fuscis, alis 

 longissimis angustis subfuscesceutibus, venis fuscis, oviductu brevi la- 

 meflis duabus longi-ovatis, pedibus fuscis longissiinis. Long. \ lin. 



Fern. Yellow. Antennae thirteen-jointed, brown, yellow at the base ; 

 joints about twice the length of their petioles. Thorax with three 

 brown stripes. Wings brownish, narrow, very long ; veins brown ; 

 transverse veinlet at three-fourths of the length of the subcostal vein. 

 Halteres yellow, with brown knobs. Oviduct short, with two elongated 

 oval valves. Legs brown, very long ; second joint of the tarsi much 

 longer than the tibiae. 



Lives in decayed beech- wood. 



Note. Loew's subgenus Dirhiza contains only one species, D. 

 lateritia, Loew. 



147. defecta, Loew, Pr. Pos. Gymn. 38. 57 (1850) ; Winn. Pal- 

 lide flava, alis longis angustis fere limpidis, venis pallide fuscescentibus, 

 halteribus albis, pedibus pallide fuscescentibus, tarsis apice albidis ; 

 Mas, antennis 15-articulatis pallide fuscis corpore duplo longioribus 

 basi petiolisque albo-flavis, his longissimis; Fcem. antennis 13-articu- 

 latis fuscis basi flavis corpore vix brevioribus, petiolis brevioribus, ovi- 

 ductu sat longo laraellis uullis. Long, fere 1 lin. 



Pale yellow. Wings nearly limpid. Halteres white. Legs pale 

 brown ; fourth and fifth joints of the tarsi whitish. Male. Antenna) 

 fifteen-jointed, pale brown, twice the length of the body ; joints half 

 the length of their petioles, which are whitish-yellow. Fern. Antenna? 

 thirteen-jointed, brown, yellow at the base, almost as long as the body ; 

 joints twice the length of their petioles. Oviduct moderately long, 

 generally retracted, without valves. 



Lives in decayed beech-wood. 



148. gracilis, Winn. Linn. Ent. viii. 298. 89 (1853). Flava, an- 

 tennis fuscis basi flavis, thorace vittis tribus niyro-fuscis, alis sublimpidis, 

 vrnis fuscis, halteribus pallide fuscis basi albis, abdomine fiavescente 

 fusco incisuris jiallidioribus, pedibus fuscescentibus aut nigro -fuscis, 

 tarsis apice niveis ; Mas, autennis 16-articulatis corpore longioribus, 

 articulorum petiolis longissimis ; Fcem. antennis 13-articulatis coi-pore 

 brevioribus, petiolis abbreviatis, abdomine toto flavo, oviductu brevi 

 lamellis duabus ovatis. Long. 1 liu. 



Yellow. Antennae brown. Thorax with three blackish-brown stripes. 

 \Yinirs nearly limpid ; anal vein and its second branch forming ;ui 

 almost right angle. Abdomen yellowish-brown, with pale sutures. Legs 



