1 14 AJV A ceo UNT OF BRITISH FLIES. 



to state that "the total habitus of the Zygotieiirce. being more Hke 

 that of the former {Cecidomyidce) than of the latter {MycetophilidcB), 

 and the tibial spurs being so very short, that in some species they can 

 only be discovered by the closest scrutiny, I think I may be justified 

 if I add them to the Cecidomyidce, though in many respects they 

 agree with the genus Sciara, which has its place amongst the Myceto- 

 philidce."* But in other characters it approaches very closely to 

 Sciara, and so it is placed amongst the Mycetophilidce. No doubt it 

 is a transitional form between the two families, and I see no reason 

 why it should be placed one side of the line more than another ; but 

 as it is so placed by Brauer, and as this work follows his classifica- 

 tion, it is placed in the present family. 



Fig. 22. — Wing of Zygoneura. 



The characters of the genus are as follows : Ocelli present, three 

 in number. Labium bilobed. Palpi 3-jointed, curved downwards. 

 Antennae i6-jointed: in $ verticillate and pedicelled joints; in ? 

 pubescent, joints sessile. Thorax elliptical. Branches of fourth 

 longitudinal vein very arcuate at the base. Halteres long. Tibial 

 spurs small or absent. One species is recorded in England, and is 

 somewhat scarce. 



Z. sciarina, Mg. 



Black, shining thorax. First part of the fourth longitudinal vein 

 ])ale ; rest of veins black. Halteres testaceous. Palpi yellow. 

 Antennae in $ as long as body; in ? shorter than body. Legs 

 yellow ; tarsi dark. Found in summer and autumn in underwoods. 



At the next genus we enter the second section, viz., the Alyceto- 

 philinm. 



Genus. — Cordyla, 'M.g. = Pachypaip us, Macq., Zett. 

 The characters of this genus are as follows : Body narrow. Ocelli 

 two, small, contiguous to the eyes. Palpi thick at base, short. An- 

 tennae incrassated, short and thick. Number of joints vary in sexes 

 and species, and also in form. Wings rather short. Abdomen some- 

 what compressed and slender. Legs short; tibiae armed with longish 

 spurs. The veins of the wings resemble Mycetophila. The larvae 

 also are said to resemble those of Alycetophila, one C. crassipalpa, 

 Macq., has been figured and described (larva and pupa) by Dufour.t 



* Dip. N. America, pt. i. , p. 7. 



t Ann. des Sc. Nat., 2e series V., xii. and xiii. (pp. 5-60 and 148-163). 



