248 MUSCID^. 



spicuo. Arista quasi exarticulata, uon nisi dorso pectinata. Alulae 

 auricula interiore quasi nulla*. Vena mediastina cum subcostali con' 

 nata, ala3 trieutera long-itudinem vix pertingens. Areolce 'pohracldalis 

 et analisperparv(B, modo non semper incompletce^ . Oviductus focminse 

 plane recouditusj. Tibiae anticse et posticse setis lateralibus ex- 

 pertes. 



Tace convex, wltlioiit memhranaceous furrows. Peristoma round. 

 Mentum short, tJtick. Antennce short ; first joint indistinct ; fourth and 

 fifth obsolete ; sixth never pectinated beneath. Subcostal and medias- 

 tinal veins smiled, hardly extending to one-third of the length of the 

 wing. PobracJual and anal areolets very minute, if not always incom- 

 plete. Alulcg with the lower valve obsolete. Fore and hind tibiae 

 without lateral bristles. Fern. Oviduct concealed. 



" None of tins, except the singularly-formed Musca mantis of 

 De Geer, had been described before the appearance of Fallen's 

 essay in the ' Stockholm Transactions' for the year 1813, in which 

 the tribe first assumed a distinct character and definite limits. 

 The author has here described nineteen genuine species, and cha- 

 racterized most of the genera ultimately admitted. The Dolicho- 

 pida were included in this tribe in the first sketch of his arrange- 

 ment of Diptera, published three years before. Latreille adds to 

 the tribe the exotic genus Bopalomera, and excludes from it the 

 type of Fallen's genus H^dromi/za, Micsca livens of Fabricius, re- 

 ferred to the Cordj/lura in accordance with Meigen's arrangement. 

 R. Desvoidy has also placed with his Hi/drellidea a group of 

 Cordj/lurce less aberrant (than C. livens) from the ordinary cha- 

 racter; the type of his genus Nuphana being the C.fraterna of 

 Meigen. Macquart, remanding Hijdromyza and Niipharia to their 

 proper place among the Cordylwra, has further limited the Hi/dro- 

 myzida, by rejecting all the species which have not the arista 

 pectinate. These he has placed in his family PiopiMlida, in con- 

 junction with many genera of diversified character and remote 

 affinity. 



"The tribe, as described by Fallen in his 'Diptera Sueciae,' 

 where he removes Hydromyza to the Scatomyzida, and rejects the 

 addition of Bojmlomera, is one of the most remote from the Ca- 

 lyptrate section, and can scarcely be confounded with any other 



* A little more apparent in Ochthera. 



t For an exception see Ephydra nasica. The imperfection of the same areolets 

 is a character of the Oscinidce also ; but in that tribe they become incomplete after 

 attaining their full development in the Lo.rocerida;. This appears as well from the 

 indication of their Hmit in the thickening of the veins and the corresponding divari- 

 cation of the radial and cubital veins, as from the analogy of the last-named tribe. 



X There is a slight exception in the subgenera Glenanthe and Teichomyxa. 



