4f)0 Orthon-hapha brachycera. 



joint slightly longer than broad, triangular, pointed. Abdomen quite 

 black. Legs without the special bristles on the front femora and 

 tibiæ and the middle femora. 



Length 2 to fully 2 mm. 



A. flaviventris is very rare in Denmark, only four specimens, a 

 male and three females, have been taken in Jutland at Hald near 

 Viborg on ^^la 1910 (the author); it was taken with the net in grass 

 and low herbage on a shaded place near a streamlet. 



Geographical distribution: — Northern and middle Europe down 

 into Germany and Bohemia; its northern limit is in Denmark, and it 

 occm^s in England. 



33. Acropsilus Mik. 



This genus has been found to show some resemblance to Chrysotus, 

 and it was first separated from this by Mik in 1878; Loew, the 

 founder of the sole species, and Kowarz had however earlier both 

 declared that it was no real Chrysotus, and I think the genus is 

 better placed in the Hydrophorinae than in the Diaphorinae ; alrei ly 

 Loew called (1. c.) attention to its relation with Medeterus, on accourit 

 of the short metatarsus, the bristles on thorax and some other char" 3- 

 ters; but I think its place may be near SchoenophUus, as it has o 

 acrostichal bristles. It is, with regard to its relations, interesting ,o 

 see, that Strobl erroneously formed the genus Pseudacropsilus (Wi i. 

 ent. Zeitg. XVIII, 1899, 122), which should be nearly related to Acrop- 

 silus, on Schoenophilus versutus and Microniorphus alhipes, thus giving 

 thereby in reality an indication of the relation of Acropsilus to these 

 genera. The only species is small, of dark, blackish colour. As 1 

 have examined only one female specimen, I shall only give some 

 characters, partly from the cited authors. The frons is broad; there 

 are ocellar, outer vertical and postvertical bristles. The eyes are 

 hairy; they are somewhat narrowly separated below in the male, as 

 the epistoma is narrowed downwards; in the female they are more 

 separated, the epistoma being broader, and in this sex the clypeus is 

 somewhat prominent below and bears here some brislles ; it does not 

 reach the lower margin of the eyes. The postocular bristles form a 

 single row. Antennæ short, of a shape about as in Medeterus, the 

 third joint small, somewhat roundish; the arista is dorsal, but some- 

 what subapical, longer than the antennæ ^ The first antennal joint 



^ Mik gives as distinguishing character against Chrysotus that the arista is distinctly 

 dorsal, but in several species of Chrysotus it has a similar dorsal position. Loew 

 savs about the arista "endstiindig". 



