500 Mr. E. E. Austen on 



thorax in cT also sometimes largely clothed with brownish 

 hair. Abdomen : dorsal scutes of third and fourth segments 

 with a more or less rectangular, transversely elongate spot, 

 as described in diagnosis above, in each basal angle, the 

 inner extremities of one or both pairs of these spots usually 

 narrower ; dorsal scute of second segment in ? , but not in 

 g , with a similar, bluntly triangular spot on each side, 

 extending to basal angle but not reaching to hind margin ; 

 lateral margins of dorsal scute of second segment in $ more 

 or less metallic ; basal angles and sides of first segment in 

 both sexes more or less metallic; hair on abdomen whitish- 

 or yellowish white in both sexes. Wings hyaline or nearly 

 so (not noticeably infuscated). Halteres mummy-brown or 

 sepia coloured, stalks somewhat paler. Legs clove-brown, 

 front and middle tibiae and distal two-thirds of front and 

 middle femora cinnamon-coloured, hind femora, hind tibiae, 

 and first joint of middle tarsi also sometimes more or less 

 cinnamon-coloured. 



Types of <$ and ? , from East Falkland, and two addi- 

 tional $ S an( l one ? 5 from West Falkland (R. Valient in) ; 

 one ?, from the "Falkland Is./' 1860 (T. Havers); and 

 one S, from East Falkland, between November, 1908, and 

 February, 1909 {Lieut. -Col. A. M. Reid, D.S.O.). 



Melanostoma bertrandi also occurs in Patagonia, as shown 

 by two <$ S i 11 the National Collection from Valle del Lago 

 Blanco, Chubut (J. Koslowsky) . 



According to Mr. Vallentin, this species, which is seen on 

 the wing only in bright sunshine, is known to settlers in the 

 Falkland Is. as " the bee." The species has been named in 

 honour of Mrs. Rupert Vallentin (nee Bertram!), a native of 

 West Falkland, who first directed her husband's attention to 

 the fact that this fly fertilizes the flowers of various species 

 of Senecio. 



Tachinidse. 



Gallipiiorinm. 



Genus Callifjioua, Rob.-Desv. 



Calliphora erythrocephala, Mg. 



One ? , West Falkland. 



With regard to the occurrence of this species (the common 

 European Bluebottle or Blow-Fly) in the Falkland Islands, 



