Aphiochaeta. 373 



costal divisions aboiit as 13 — 8 — 4 and 1 thus longer than 2+3; 

 costal cilia long; angle at fork not small; fourth vein curved in its 

 first part, for the rest very slightly curved. Halteres brown to black, 



Female. Similar to the male; the antennæ, though not small, 

 scarcely so large; the lower supraantennals smaller; the hairs below 

 hind femora about as in the male. 



Length 1,5 to nearly 2 mm. 



The above description is mainly drawn from a copulated pair 

 (Geel Skov 'Vs 1918); I have compared it with typical specimens 

 from Wood and I fmd it agreeing, but the male of the species will 

 be very difficult to distinguish safely from tumida^ for, as already 

 remarked, I cannot confirm the statement about the hypopygium 

 given by Wood for tumida; as far as I can see the hypopygium is of 

 the same shape in the two species. Characters which should serve to 

 distinguish it are the larger antennæ, the not fully as long costal 

 cilia, and the first costal division being longer than 2 + 3, but this 

 latter character loses a good deal of its value as the costal divisions 

 may vary somewhat. From typical fusca the male angusta may be 

 known by the costal divisions, the hypopygium, and the generally 

 smaller size, whereas, on the other hånd, the angusta female will be 

 difficult to distinguish from the jusca female, for, as said above under 

 fusca^ females, probably belonging to this species, occur which have 

 the costal divisions approaching to what is found in angusta. From 

 all this it is seen, tliat I cannot at present distinguish with certainty 

 the males of tumida and angusta, nor the females of fusca and angusta. 

 I possess a very large material of angusta, and I fmd it somewhat 

 varying, not only, as already mentioned by Wood, in the realtive 

 size of the pairs of supraantennal bristles, but also as regards the 

 costal divisions and the size of the fork, and perhaps more than one 

 species is hidden in my material, but the described copulated pair 

 represents, I think, Wood's angusta. The size of the species, when 

 I take my whole material, is 1 — 2 mm. 



A. angusta is very common in Denmark all over the country in 

 woods in humid piaces, running on leaves of bushes and in low herbage 

 from early spring to late autumn ; I have also taken it on fresh stubs 

 of Acer. The dates are ^4— "/lo in 1917 to 1921. 



Geographical distribution: — Hitherto known from Denmark, 

 England and, according to specimens sent from Pater Schmitz, from 

 Holland; it also occurs in Prussia (Schmitz, Tijdschr. v. Entom. 

 LXIV, 1921, 3); in the place cited Schmitz terms it a somewhat 



