The Insects of the "Danmark" Expedition. Q\ 



6. Rhamphomyia sp. 

 Two specimens. 



This species greatly resembles R. hirtula Zett. in general appearance 

 but differs in the construction of the male hypopygium and in the 

 female having darker wings. Like R. hirtula it seems to be somewhat 

 nearly related to R. Brusewitzii Holmgr. but according to the 

 description the hypopygium of this species is otherwise constructed. 



7. Melanostoma ambigua Fall. 



One male from the end of June 1908; two females, the one from 

 June 23 1907, the other from the beginning of June 1908. 



8. Helophilus groenlandicus O. Fabr. 



One specimen. '' s 07. 



9. Syrphus tarsatus Zett. 



A couple of specimens from July 1908. 



10. S. arcuatus Fall. 



A couple of specimens from July 1908 and July 1907. 



11. Catabomba groenlandica n. sp. 



Male. The head is somewhat low and the face extraordinarily 

 broad; the frons is distinctly inflated. The face is dark- or dirty 

 yellow and blackish yellow towards the sides, the frons is black, 

 but yellowish red just above the anlennæ, it and the sides of the 

 face are very slightly dusted; the jowls and the lower margin of 

 the mouth aperture are black. The antennæ are black or blackish. 

 The frons has very long, black hairs Avhich extend down the cheeks. 

 Occiput is black, somewhat greyish dusted; the bristles along the 

 upper eye margin are black, and they are long and overhanging. 

 The eyes are clothed with long, but not dense, white hairs; they 

 have the upper facets distinctly larger than the lower, the small 

 facets stretch up along the posterior margin. Thorax is dull æneous 

 black, pleuræ of the same colour; the disk is clothed with long, 

 black or brownish black hairs. Scutellum is blackish yellow, some- 

 what translucent, clothed with long, black hairs. Abdomen is 

 æneous black, somewhat shining, the first segment a lillle dullish; 

 there are three pairs of yellowish spots, those on the second segment 

 are small and indeterminate, and they may be quite wanting, the 

 segment then being quite black; the two other pairs are somewhat 

 lunulate, the front margin being slightly excised, but the hind margin 

 well rounded; the spots are situated at the front margin of the 

 segment but are not in connection with it, and they are also well 

 away from the side margin; the hind margin of the fourth segment 

 is distinctly, that of the fifth segment less distinctly reddish yellow. 

 The venter is black, sometimes with paler incisures. Abdomen is 



