Aphiochaeta. 379 



consequence, though in America there is, besides the present species, 

 still another with similar hind tibiæ, A. Smithii Brues, but this species 

 has the costa reaching beyond the middle. 



A. albidohalteris is not uncommon in Denmark; Copenhagen, 

 Holte, Hillerød, Suserup Skov at Sorø, Bogø south of Sealand, on 

 Falster at Marienlyst, on Ærø and Taasinge and in Jutland at Hejls 

 south of Kolding, Ry and Løkken and fmally on Læsø (Th. Mortensen, 

 the author); the dates are ^Ve — 7io in 1917 to 1921. The species has 

 not been bred here, but in America it has been bred from various 

 fungi. 



Geographical distribution: — In Europe at present only known 

 from Denmark and England, but also occurring in North America. 



121. A. rubescens Wood. 



1912. Wood, Eiit. Moiitli. Mag. 2, XXIII, 170, fig. 4. - 1914. Brues, 

 Bull. Wisc. Nat. Hist. Soc. XII, 130. 



Male, Frons broader than high, greyish black, dull, it may be a 

 little reddish just at the lower corners; inner bristle of lower row in 

 or nearly in the same height as the outer, and nearer to it than to the 

 upper supraantennal; supraantennal bristles unequal, the lower 

 scarcely half the size of the upper; the upper supraantennals approxi- 

 mate, fully as near to each other as the inner bristles of middle row, 

 the lower about equally as distant. Antennæ not large, red, arista 

 distinctly pubescent. Palpi yellow, well developed, with rather long 

 bristles. Thorax reddish, sometimes blackish except humeri, it is 

 slightly shining, with brownish pubescence. Pleura reddish. Meso- 

 pleura greyish, bare. Abdomen black, dull, the very short hairs a 

 little" more visible at the hind margins of the segments and slightly 

 elongated at the hind margin of sixth segment. Hypopygium some- 

 what large, shorter than the sixth segment, but of the same breadth; 

 it is reddish or greyish, the lower hinder corners a little produced; 

 along the lower lateral margin there are on each side about six strong 

 bristles and upwards some smaller hairs; ventral plate broad, yellow, 

 not reaching to the end of the hypopygium; anal tube of medium 

 size, yellow, the apical hairs quite small. Legs yellow, hind femora 

 more or less darkened at the tip, the hairs below the basal part distinct, 

 but only longish; bristles on hind tibiæ numerous and hair-like. 

 Wings yellowish or yellowish brown, veins brown; costa reaching 

 to the middle, 1 about equal to 2 + 3 or slightly longer; costal cilia 



