Diptercfi I c 



Phormia terrae-novae Etobineau-Desvoidy. 



Phormia terrce-novce Robineau-Desvoidy. Essai sur les Myodaires, p. hi7, L830 



Thirty-eight specimens with data as follows: sixteen specimens, Bernard 

 harbour, Dolphin and Union strait. Northwest Territories, June, July and August, 

 1915; one specimen, same locality, July 10. 1916; eight specimens, same Locality, 

 June and July, 1910; three specimens, Nome, Alaska, August 24, 25, L916; 

 five specimens, Teller, Alaska, July and August. 1913; three specimens, Collin- 

 son point, Alaska, June, 1914; two specimens. Demarcation point, Alaska, 

 May 13, 1914 (F. Johansen). 



Phormia caerulea, n. sp. 



Male and Female. — Dark metallic blue, without pruinescence. Head 

 black, frons opaque, orbits slightly shining; third antennal joint sometime- 

 brownish; palpi yellow, usually fuscous at apices in male. Dorsum of thorax 

 with two slender, widely separated vittse on anterior portion mesad of dorso- 

 centrals. Legs black. Wings clear, slightly infuscated at extreme bases. 

 Squamae brown. Halteres fuscous, paler in female. 



Male. — Frons narrowest at centre, where it is one-fifth the head-width, 

 orbit at widest part, just below ocelli, narrower than interfrontalia; orbit- 

 hairy, bristles differentiated but not very strong; arista rather short-plumed, 

 apical third bare; profile as in Plate VIII, figure 19. Thorax not so noticeably 

 depressed as in other species, the postsutural dorso-centrals sometimes well 

 developed, the posterior pair usually so; both spiracles very large, the prothoracic 

 one extending from close to upper margin of pleura to within a short distance 

 of coxa, the covering of both spiracles deep black; lower margin of anterior 

 spiracle with many long bristly hairs; upper calypter with long hairs on upper 

 side, when closed. Hypopygium small; fifth sternite as in terrce-novce. Legs 

 as in terrce-novce. Inner cross-vein very little proximad of apex of first vein; 

 outer cross-vein less distinctly curved than in terrce-novce; fourth vein almosl 

 rectangularly bent, usually with a short appendiculate vein at angle. 



Female. — Similar to the male in colour. 



Differs in structure by having the frons two-fifths the head-width, the orbit 

 half as wide as interfrontalia, with two distinct supraorbital outer bristles. 



Length, 0-8-5 mm. 



Type locality: Bernard harbour, Northwest Territories. May 24, 1915 

 (F. Johansen). Paratypes, same locality, May, June, and July, lit 15, L916 

 (F. Johansen). 



This species resembles Phormia terrce-novcv very closely in some respects, 

 but is undoubtedly distinct. Zetterstedl described a species from Greenland 

 under the name groenlandica, which has been sunk as a synonym of terrce-novce. 

 As both species probably occur in Greenland it is not possible to decide the 

 validity of the accepted synonymy without an examination of the type of 

 Zetterstedl 's species. 



The appended key gives a summary of the distinguishing character- of the 



species. 



KEY TO SPECIKS. 



MALES. 



1. Eyes separated by a narrow line; anterior thoracic spiracle with yellow-haired covering- 



flaps ' regina Meigen. 



Eyes separated above by a space at leasl twice as broad as distance across posterior ocelli; 



anterior thoracic spiracle with black-haired COVering-flaps 2 



2. Narrowest pari of frons about one-half as greal as width of eye seen from above; anterior 



thoracic spiracle very Large; outer cross-vein of wing very slightly curved .cm ruin, n. sp. 



Narrowest pari of frons not over one-fourth as greal as width of either eve: anterior 



thoracic spiracle not very Large; outer cross-vein of wing abruptly bent 



terrce-novce Robineau-1 )esvoidy. 



