The North American Species of Cryptolucilia. 
91 
1922] 
2. Cryptolucilia cornicina (Fabricius) (=Musca cornicina 
Fabrieius, Spec. Insect., 2, 1871, p. 438). Thorax without 
acrosticals before the transverse suture; four posterior dorso- 
centrals. Front comparatively narrower in both sexes. 
This species is thus far unknown from North America. 
In Europe, however, it is not less common than the foregoing. 
I have examined a male from Rambpuillet, France, kindly sent 
to me by Dr. Villeneuve. 
Stein (Arch. f. Naturg., 83, Abt. A, Heft 1, 1919, p. 105) 
synonymizes Pyrellia frontalis Thomson (Eugenies Resa, 2, 
Zook, 1, Diptera, 1868, p. 545), from California, with C . cornicina. 
Whether this is based on an examination of Thomson’s type 
specimen is not known, but the description applies equally well 
to C. ccesarion. 
The failure of North American entomologists to separate 
ccesarion and cornicina is evidently due to the confusion on this 
subject which has been allowed to prevail until recent years 
by European dipterists. Even Girschner while establishing his 
genus Pseudopyrellia on “P. cornicia Fll.” was evidently using 
specimens of ccesarion , since he expressly mentions among the 
generic characters the presence of a pair of heavy acrosticals. 
Schnabl and Dziedzicki (Die Anthomyiden. Nov. Acta Ac. 
Leop. Car. Nat. Cur., 95, 1911, pp. 224 and 229) repeated the 
same error. The two species, however, have been correctly 
separated by Stein (Arch. f. Naturg., 81, Abt. A, Heft 10, 1916, 
p. 18), who has also examined their type specimens. 
Considering the constant association of Cryptolucilia 
ccesarion with cattle dung, the question might be raised whether 
this fly has not been imported from the Old World through the 
agency of man, at a comparatively recent date. It is, moreover, 
remarkable that of the two common Palearctic species, only 
one has thus far established itself in North America. 
