Dolichopodidae. 293 



and which I feel certain belong to this species; but, as mentioned, 

 they have the bristles at the end of the front coxæ black, and this 

 faet troubles me somewhat; Verrall notes (Ent. Month. Mag. XII, 1875, 

 148), that the female has no blaci<: bristles on the front coxæ. Yet I 

 have no doubt that my specimens are monotrichum ; moreover they 

 cannot be auctum, and lanceolatum has according to Kowarz (Wien. 

 entg. Zeitg. III, 1884, 108) the third antennai joint "fast nierenformig 

 und stumpf". Perhaps the bristles in question may vary in colour. 



X. monotrichum is somewhat rare in Denmark; Dyrehaven at 

 Røde Bro, Lyngby Mose, and on Langeland at Lohals (the author); 

 in Jutland at Holstebro (H. J. Hansen). My dates are ^l-, to the first 

 part of August. It has been taken in fens and on meadows; I took 

 my specimens espeeially on leaves of Alnus and Rubus. 



Geographical distribution: — Northern and middle Europe, down 

 into Styria and Hungary; towards the north to middle Sweden, and 

 in Finland. 



3. X. auctum Loev^. 



1857. Loew, Neue Beitr. V, 32 (BJiaphium). — 1862. Schin. F. A. 1, 

 195 {Bhaphium). — 1903. Kat. palåarkt. Dipt. 11, 334. 



Male. Of this species I have only been able to examine the 

 female, I therefore take the following from Loew: Similar to mono- 

 trichum, but larger; the third antennai joint longer than in mono- 

 trichum, the arista relatively shorter, not quite half as long as the 

 antennæ. ^ The outer lamellæ of the hypopygium similar to those in 

 monotrichum, a little shorter, without any long hair at the apex; the 

 ventral lobes small and hidden. The front tarsi as in monotrichum 

 with the first joint somewhat thickened below at the apex, but it is 

 longer, a little longer than the four following joints; the second joint 

 scarcely as long as the third and fourth together; the front tarsi have 

 somewhat stronger hairs above; the second joint of the hind tarsi is 

 alrnost one and a half times as long as the first, while in monotrichum 

 it is only a little longer, the third joint is as long as the first. The 

 colour of the body and legs as in monotrichum, but the scutellum 

 steel-blue. According to Verrall (1. c.) the coxal bristles are 3—4: 

 1 — 2:1, and the hind femora have a preapical bristle. 



' Here may certainly be some mistake, since in monotrichum the arista is aljout 

 one third of the antennæ. Verrall (Entom. Month. Mag. XVI, 1905, 168) found 

 also the arista to be less than one third of the third antennai joint. If 

 Loew's measurement is due to a mistake, the doubt about the identifieation 

 expressed by Verrall disappears. 



