CECIDOMYIA. 93 



the length of the body ; double joints as long as the petioles. Fern. 

 Antennaj rather longer than the body ; petioles one-fourth shorter than 

 the joints. Oviduct short, with two small yellowish valves. 

 Lives ill most species of Polf/porus. 



49. socialis, Winn. Linn. Ent. viii. 251. 38 (1853). Fcem. flava, 

 antennis pallide fuscis, tJiorace vittis tr lb us fuse is, alis subcinereis, venis 

 pallide fuscis, oviductu brevissimo lamellis duabus rotundatis. Long, f 

 lin. 



Fem. Yellow. Antennae pale brown, as long as the body ; joints ayid 

 their petioles of equal length. Thorax with three hrowyi stripes. Wings 

 greyish, with grey pubescence ; veins pale brown ; transverse veinlet 

 joining the middle of the subcostal vein ; cubital vein ending at almost 

 in front of the tip of the wing ; second branch of the anal vein curved 

 to the hind border. Oviduct very short, with two rounded valves. 



Lives ill the woody excresceiices on tlie branches of most species 

 of Rvhus, with the larvse of Las'wptera Ruhi. 



50. brevis, n. Mas, testacea, brevis, capite nigro, antennis va- 

 lidis, artic^lorum petiolis drevissimis, thoracis disco fuscescente, alis sub- 

 cinereis, halteribus albidis, pedibus validis testaceis. Long. |- ; alar. 3 

 lin. 



Male. Testaceous, short. Head black. Antenna twelve-jointed, 

 stout, submoniliforra, verticillate-pilose ; joints double, elongate, sub- 

 cylindrical, with extremely short petioles. Disc of the thorax brownisJi. 

 Wings hardly greyish, ciliated ; veins pale testaceous ; subcostal much 

 less than half the length of the wing ; cubital almost straight ; sub- 

 anal not apparent beyond the fork of the anal ; first branch of the anal 

 distinct, slightly curved ; second branch curved obliquely and rather 

 abruptly to the border. lialteres whitish. Legs pale testaceous, rather 

 short and stout. 



Eare. (E.) 



51. minuta, Winn. Linn. Ent. viii. 250. 37 (1853). Mas, ru- 

 fescente-llava, antennis fuscis corpore duplo longioribus basi flavis, 

 thorace vittis tribus fuscis, pectore nigricante, alis limpidis, venis fuscis, 

 halteribus albis, pedibus fuscis subtus pallidis. Long. \ lin. 



Male, lleddish-yellow, with hoary hairs. Anteniuc brown, yellow at 

 the base, twice the length of the body. Thorax with three almost con- 

 tiguous broicn stripes. Pectus blackish. Wings limpid, with blackish- 

 grey pubescence ; veins slender, brown ; transverse veinlet beyond the 

 middle of the subcostal vein ; cubital vein straight, slightly curved 

 hindward near the tip, ending at almost in iVont of the tip of the wing, 

 Halteres white. Legs broivnish, pale beneath. 



Habits unknown. 



52. genictilata, Winn. Linn. Ent. viii. 251. 39 (1853). Mas, 

 flava, antennis fuscis corpore fere duplo longioribus, thorace fusco-tri- 

 vittato, alis limpidis, venis fuscis, abdomiue flavo-fusco incismis albidis. 



