250 



Phoridae. 



with bristles on the sides of second segment. Venter with distinct 

 hairs. Hypopygium mainly as in latifemorata^ perhaps a little larger, 

 not shining below; anal tube as in latifemorata. Legs yellow, hind 

 tibiæ and tarsi slightly darker, middle coxæ with a black spot behind, 

 and hind femora blackish at apex; the hind femora less dilated than 

 in latifemorata and not broad towards apex, the dorsal margin there- 

 fore evenly curved from the middle towards both ends; hind femora 

 haired as in latifemorata and hind tibial bristles similar, the arrange- 

 ment mentioned under latifemorata generally well marked. Wings 

 brownish, but less strongly than in latifemorata; costa reaching beyond 

 the middle, 1 generally shorter than 2, but variable and sometimes 

 a little longer; costal cilia moderately short to 

 moderately long; fourth vein a little less curved 

 than in latifemorata. H alteres yellow\ 



Female. Similar to the male, but often paler; 

 antennæ smaller; the abdominal tergites of a 

 special shape (fig. 81), the second tergite has the 

 sides with the bristles somewhat protruding, 

 but is narrowed behind, the third tergite is semi- 

 circular or trapezoidal, the fourth is narrow, 

 trapezoidal, most narrow in front, sometimes 

 pointed so that the incision here reaches to the 

 middle line, the fifth tergite is a little broader, 

 the sixth again somewhat narrower so that these 

 three tergites form together an elliptical plate; 

 such is the shape in extreme cases, but often the 

 tergites are broader so that the constriction is less marked, only 

 resulting in the tergites after the second being somew^hat narrowed; 

 on the ventral side abdomen has bristly hairs at the hind margins 

 of third to sixth segments; hind femora haired as in the male and 

 the hairs below the basal half as long as in this sex. 

 Length 1,7 — 2,8 mm. 



A. ruficornis is common in Denmark; Ermelund, Dyrehaven, 

 Lyngby Mose, Holte, Ruderhegn, Suserup Skov at Sorø, Bogø south 

 of Sealand, on Langeland at Lohals and in Jutland at Hejls south of 

 Kolding, Ry, and on Bornholm at Rø. My dates are ^Vs — ^Vs; I have 

 taken it in copula on ^Ve. It was for the first time taken in 1883. A 

 pupa was taken at a pond in Ruderhegn in flood refuse on ^/s, it devel- 

 oped on ^7« (Kryger). On Ve the species was taken at Holte very 

 numerously on a putrid Anodonta (Th. Mortensen), all the specimens 



Fig. 81. A. ruficornis $ 

 typical abdomen. 



