CECTDOMYIA. 83 



Lives in the top leaves of Fraxinus excelsior, forms hollow pod- 

 shaped cells, and undergoes its transformation in the earth. 



18. costalis, n. Mas,fusca, capite nigro, antennis nigris 20-arti- 

 culatis, thorace vittis tribus cinereis, scutello pectore abdomineque testa- 

 cm, alis subcinereis, costa venisque nigris, pedibus testaceis, tibiis apice 

 tarsisque fuscis. Long. \\ ; alar. 3 Tin. 



Male. Head black. Antennas black, twenty-jointed, moniliform ; 

 joints successively decreasing in size, their petioles a little longer than 

 the incrassal ed part. Thorax brown, toith three grey stripes ; scutellum> 

 pectus, and abdomen testaceous. Wings greyish, with blackish borders ; 

 costal vein and cubital vein black, the former ending much before the 

 middle of the wing, the latter near the tip. Halteres testaceous. Legs 

 testaceous, long, slender ; tibiaB towards the tips and tarsi brown. 



Not common. (E.) 



19. Cardaminis, Winn. Linn. Ent. viii. 225. 13 (1853). Nigra, 

 antennis fuscis 1 6-1 7 -articulatis, thorace cinereo nigro-trivittato, scu- 

 tello nonnunquam carneo, alis limpidis violaceo-cyaneo iridescentibus, 

 halteribus abdomineque fulvis, hoc incisuris fuscis, pedibus nigro-fuscis 

 subtus albidis basi argenteo-hirtis. Long. | f lin. 



Black. Antennse sixteen- to seventeen-joirited. Wings with blackish- 

 grey down ; veins brown ; costa stout, deep black ; subcostal vein very 

 near the costa ; transverse veinlet pale but distinct, joining by the mid- 

 dle of the subcostal vein ; cubital slightly bent forward at its junction 

 with the veinlet, then somewhat convex on the hind side, straight along 

 its apical third part, joining the costal at some distance from the tip of 

 the wing ; second branch of the anal covered to the hind border. Male. 

 Antennae as long as the body ; petioles of the joints towards the base 

 short, those in the middle one-fourth shorter than the joints. Fern. 

 Antenna? as long as the head and the thorax together; cubital vein 

 straight from the transverse veinlet to the border. Abdomen flesh- 

 colour, with deep black bands on the hind borders of the segments. 

 Oviduct whitish-yellow, elongated, without valves. 



Lives in the flowers of Cardamine pratensis ; changes to the 

 pnpa state in the earth. 



20. Cratsegi, Winn. Linn. Ent. viii. 228. 15 (1853). Nigra, 

 palpis fusco-flavis, antennis 15IQ-articulatu, thoracis lateribus meta- 

 thoraceque carneis, alis limpidis nigro-hirtis, costa nigra, halteribus albis, 

 abdomine carneo fasciis nigris, pedibus nigro-fuscis subtus albis. Long, 

 f lin. ; alar. 2 lin. 



Subcostal and cubital veins blackish-brown ; transverse veinlet pale, 

 situate at the middle of the subcostal vein ; cubital vein bent forward 

 at its junction with the veinlet, afterwards straight or almost curved 

 forward, joining the costal at some distance in front of the tip of the 

 wing ; second branch of the anal curved to the hind border. Male. 

 Antennae sixteen-jointed, rather shorter than the body ; joints and their 



