Pipiza. 91 



in front of the ocelli but almost none above the antennæ. Thorax 

 and abdomen more coarsely piinctate than in the male, abdomen al- 

 most not shining. Thorax with short, whitish hairs, also pale on the 

 plem-a. Abdomen haired as in the male, but the black-haired parts 

 smaller. Wings with the blotch still stronger and quite defined out- 

 wards. 



Length 7,5—8,5 mm. 



The determination of this species is certain as I have compared 

 it with the type of Fabricius which we have in the collection of 



Fig. 29. Wing of P. liigubris (S- 



Tonder-Lund and Sehestedt. — The species has almost always an 

 unspotted abdomen, but I have seen a male and a female with a 

 pair of not small, but very dark and undefined and thus slightly 

 visible spots. The species is in most cases easily distinguished from 

 the preceding ones by the want of abdominal spots, and with excep- 

 tion of signata by the white-haired epistoma in the male; I have, 

 however, seen a couple of specimens with almost or quite dark-haired 

 epistoma. It may otherwise be known by the relatively long third joint 

 of the antennæ and the strong, distinctly defined blotch on the wings,, 

 which is stronger and more defined than in any of the preceding species, 

 It will be most difficult to distinguish from signata, but also here the 

 wings, the antennæ and the thicker hind femora may be used, and 

 perhaps also the more white-haired frons of the female. Malm (K. V. 

 och V. Samh. Goteborg Handl. VII, 1860, 65) considered geniculata 

 as a variety of luguhris not regarding the abdominal spots being of 

 any value, and Wahlgren (Entom. Tidskr. XIII, 1909, 16) piaces geni- 

 culata as a synonym to luguhris. Under bimaculata I have remarked 

 that geniculata seems to me a probable synonym to signata rather 

 than to bimaculata ; I am at present not quite certain with regard to the 

 specific distinctness of signata against luguhris; should they in future 

 prove to be identical the synonym geniculata would then come to 

 luguhris as is the opinion of Malm and Wahlgreen. 



