58 c Canadian Arctic Expedition, 1913-18 



Frons bristled as in robusta; ' cheek with four well-differentiated bristles, 

 two of which are much stronger than the others, the normal hairs strong; third 

 antennal j oint very little shorter than second ; arista short, thickened to distinct- 

 ly beyond middle; profile as in PI. VIII, fig. 21. Dorso-centrals irregular in type, 

 three strong ones on one side and three strong and one weak one on the other; 

 three sternoplurals. Abdominal segments two to four with discal macrochaetse. 

 Wings as in robusta. Fore tarsi dilated. 



Length, 9- 75mm. 



Type Locality: Cockburn point. Northwest Territories, Canadian Arctic 

 coast, September 5, 1914 (F. Johansen). 



The only species I find record of from the arctics is aenea Staeger, described 

 from Greenland. This species has the abdomen entirely black and is apparently 

 distinct from arctica. 



CALLIPHORID^. 



This family contains a number of genera the larvae of which feed normally in 

 carrion. The flies are popularly known as flesh-flies, bluebottles, and blow-flies. 



Originally the genera now included here formed part of the family Muscidse 

 but within recent years the latter has been divided, several families now contain- 

 ing genera that at one time formed part of the Muscidse. It is at present, accord- 

 ing to some entomologists, a debatable point whether our concept of the Muscidse 

 should not be revised to the extent of applying the name to what is now called 

 Anthomyiidse and dropping the last name entirely. With this view I do not 

 agree, but the present paper is not the proper place to discuss the question, more 

 especially as there are no true Muscidse in the collection. . 



Cynomyia Robineau-De^voidy. 

 There is but one species of this genus in the collection. 



Cynomyia cadaverina Robineau-Desvoidy. 



Cynomyia cadaverina Robineau-Desvoidy. Essai sur les Myodaires, p. 365, 1830. 



Twenty-four speciinens with data as follows: thirteen specimens, Bernard 

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

 1915 and 1916 (F. Johansen) ; six specimens, Barter island, Arctic coast of Alaska 

 June, 20 and 23, and July 2, 1914, and June 15, 1914 (D. Jenness) three speci- 

 mens, west of Kongenevik, Camden bay, Alaska, June 4, 1914 and two speci- 

 mens, Nome, Alaska, August 24, 25, 1916 (F. Johansen). 



Calliphora Robineau-Desvoidy. 

 There is one species in the collection, represented by three specimens. 



Calliphora viridescens Robineau-Desvoidy. 

 Calliphora viridescens Robineau-Desvoidy. Essai sur les- Myodaires, p. 537, 1830. 



This species occurs in Europe and North America. Like the preceding 

 species it is generally distributed throughout North America, and has been pre- 

 viously recorded from Alaska. 



Data on specimens: Nome, Alaska, June 21, 1916 (F. Johansen). 



Phormia Robineau-Desvoidy. 



There are two species in the collection, one of which, terrce-novce, occurs 

 generally throughout North America, and has been reported from Greenland and 

 Alaska. 



