202 Mr. F. W. Rdwatte on British Limnobiidae. 
dark brown, coxae and bases of femora ochreous. Wings hyaline, 
iridescent; the stigma very faint; veins dark; in shape rather long 
and narrow, the narrow basal portion somewhat elongate, the 
anal angle very little prominent. Venation without any noteworthy 
peculiarity, practically as in D. sericala. Halleres very long and 
slender; if extended backwards they would reach to the middle of 
the third abdominal segment; knob elongate; colour blackish 
except for base of stem. Length of body, 6 mm.; wing 7 mm.; 
halteres 1-5 mm. 
The British Museum collection contains only the type, 
a male from Catacol, Arran, Sept. 1920 (J. Waterston). 
A second male, from Kirkmichael, Perth, is in Mr. A. E. 
J. Carter’s collection. 
This interesting species shows much resemblance in the 
structure of its hypopygium to D. ponojensis Lundst. ; 
there are, however, a number of small differences, and 
Lundstrém does not mention the long halteres. The 
North American D. halterata O.S., would seem to be allied, 
but can hardly be the same. In the shape of the wings 
D. halterella shows some approach to the tropical genus 
Thrypticomyia, but the halteres are even longer than in 
that genus, and the antennae are quite different. The 
North European, D. danica Kuntze, is similar in several 
respects, but has halteres of the normal length. 
D. sericata Mg. I find this species abundant on rather 
dry cultivated land in May and June. Though well 
distinguished in coloration, its hypopygium is very similar 
to that of D. autumnalis, both species having long hairy 
ventral processes from the side pieces. 
D. sera Walk. This, according to Walker’s type, is the 
species figured by de Meijere as D. forcipula. Other 
synonyms are globata Walk., disjuncta Wall., and discors 
Kuntze. It differs markedly from all its alles in the 
structure of the hypopygium, the fleshy lower claspers 
being long, narrow and bent in the middle; the only other 
British species bearing even the slightest resemblance to 
it being D. morio. Apart from Walker’s types, I have only 
seen it from Aldeburgh, Suffolk (Verrall) and Wareham and 
Studland, Dorset (Yerbury). 
D. rufiventris Strobl. This was added to the British 
list by Mr. A. E. J. Carter (Ent. Mo. Mag. 1913, p. 180). 
My colleague, the Rey. J. Waterston, took two males at 
Bonawe, Argyll, August 1919. 
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