170 THE BLOWFLIES oF NortH AMERICA 
marginal bristles; third segment with a marginal row of about. 
16 to 18 long thin bristles; fourth segment with abundant, long, 
erect, scattered hairs; first sternite longer than broad, each suc- 
cessive sternite smaller. 
This is the most distinctive genus in the tribe Phormiini. The 
head is elongate, the apical cell is closed in the wing margin, and 
the arista is pubescent. 
Boreellus atriceps (Zetterstedt) 
Sarcophaga atriceps Zetterstedt, Diptera Seandinaviae, vol. 4, 
p. 1311, 1845; Bonsdorff, Finlands Tvavingade Insecter, 
vol. 2, p. 1438, 1866; Holmgren, Ent. Tidskr. 4:165, 1883. 
(Type, female from Mullsjo, Sweden, in Lund). 
Phormia boganidae Erichson, Middendorff’s Reise in den Aus- 
sersten Norden und Osten Siberiens 1843-44, vol. 2, no. 1, 
p. 67, 1851; Rohdendorf, Ent. Mitt. 13 (6) :283, 1924; Vil- 
leneuve, Soe. Ent. de Belg. Bull. et Ann. 70:42, 1930. (Type 
male in Zoological Museum of the Russian Academy of 
Science). New synonymy. 
Melinda atriceps (Zetterstedt). Hendel, Wien. Ent. Ztg., 20:33, 
1901. 
Onesia (Sarcophaga) atriceps (Zetterstedt). Becker, Mem. Imp. 
Acad. Sei. St. Petersburg (8) 18 (10) :5, 1907. 
Onesia atriceps (Zetterstedt). Frey, Acad. Sci. Russ. Mem. 29 
(10) 33-5,91916: 
Phorm caerulea Malloch, Canadian Arctic Expedition Rpt., 
vol. 3, p. 59¢e, 1919. (Type, male from Bernard Harbour, 
Northwest Territories, in Canadian National Collection). 
Boreéllus aristatus Aldrich and Shannon, Insecutor Inscitiae 
Menstruus 11:107, 1923. (New name for caerulea Malloch, 
preoccupied). 
Mallochomyia johanseni Townsend, Insecutor Inscitiae Men- 
struus 14:25, 1926. (New name for caerulea Malloch, pre- 
occupied). 
Phorm atriceps (Zetterstedt), Collin, Ann. and Mag. Nat. Hist. 
16 :335, 1925; Ann. and Mag. Nat. Hist. (10) 7:78, 19381. 
Boreellus atriceps (Zetterstedt), Aldrich, Brooklyn Ent. Soe. 
Bul. 22:22, 1927; Johnson, Psyche 36 (2) :141, 1929; Mc- 
Dunnough, Nat. Mus. Canada Bull. 53 :119, 1928; Villeneuve, 
Soc. Ent. de Belg. Bull. et Ann. 70:42, 1930; Townsend, Rev. 
de Ent. 1:71, 1931; Enderlein, Gesell. f. naturf. Freunde 
