104' [May. 



informs me that he has found and reared a species of Miastof- near 

 Cambridge. But the species are difficult to rear and cannot be named 

 from larvae alone, I have, however, also been fortunate enough to 

 obtain a number of adults of one apparently undescribed species, which 

 it may be of interest to name and record. The specimens were all taken 

 on windows in m}' house at Letchworth, chiefly during June 1917, a few 

 in August 1917, and one or two in June 1918. While conforming to 

 Kieffer's description of the genus Leptosyna, they show obvious dif- 

 ferences from the two known European species, and may be described 

 as follows : — 



Leptosyna setipennis, n. sp. 



(S . Body brownish yellow, long, and narrow. AVings transparent. Palpi 

 composed of a single joint, which is retracted within the mouth-cavity and 

 bears a single terminal bristle about as long as the joint. Antennae with 

 2 + 10 joints, the last joint bearing an appendage resembling another joint, as 

 long as but narrower than the basal part. First scapal joint with a single 

 long ventral bristle, second bare. Flagellar joints with verticils of about 



Leptosyna setipeimis, n. sp. Wing. 



8 hairs which are about three times as long as the joints ; the first two have 

 one or two additional long hairs near the base. All flagellar joints except the 

 first and last drawn out into necks which are almost as long as the more 

 swollen basal portion ; at the base of the neck there appears to be a small 

 round pore, just below which are inserted the verticillate hairs. Genital 

 claspers barely twice as long as broad, with a short thick terminal spine. 

 Legs rather slender ; femora scarcely, tibiae not at all thickened towards the 

 tip All tarsi alike; proportionate lengths of joints 1 : 2: 1-5 : 1 : 1, Claws 

 simple ; empodium barely half as long as the claws, Whiffs slightly pointed, 

 with a very long posterior fringe ; the surface appears minutely dotted when 

 seen under a |" objective, while towards the tip are about 20 suberect hairs 

 directed towards the base of the wing. Sc terminating before, Cu slightly 

 beyond the middle of the wing ; R obsolete both basally and apically ; all 

 veins setose except base of Cu. 



2' Antennal joints almost globular, without neck, hairs inserted just 



