1910] Wheeler—North American Forms of Lastus umbratus 239 
New Mexico: Beulah (Cockerell; topotype), one deiilated 
female. 
Colorado: Two females, one deiilated, taken by P. J. Schmitt; 
one deiilated female taken by myself in Cheyenne Cafion (about 
8,000 ft.), near Colorado Springs; numerous workers from Wil- 
liams Cafion, near Manitou (about 7,500 ft.), also captured by 
myself. 
Utah: Numerous workers from Little Willow Cafion (C. V. 
Chamberlin). 
Nova Scotia: Many workers, males and winged females taken 
from five colonies by Mr. John Russell at Digby, and six deiilated 
females taken at Bedford, near Halifax by Mr. William Reiff. 
Dr. P. P. Calvert and Mr. E. T. Cresson, Jr., kindly compared 
one of the female specimens from Nova Scotia with Viereck’s 
type and state that the former differs from the latter only in 
being somewhat more yellowish and less reddish. I am unable 
to detect any differences even in coloration between my Rocky 
Mountain specimens and those from Nova Scotia. 
It is interesting to note, as bearing on the probable temporary 
parasitism of uwmbratus, that the six deilated queens taken by 
Mr. Reiff at Bedford, N. S., were found living in three colonies of 
the large yellowish form of Lasius niger var. neoniger Emery so 
characteristic of boreal America. 
2. Lasius umbratus mixtus Nyl. var. aphidicola Walsh. 
Formica aphidicola Walsh, Proc. Ent. Soc. Phila. 1862, p. 310, worker <. 
Lasius aphidicola Mayr, Verh. zool.-bot. Ges. Wien, XXXVI, 1886, p. 429; 
Dalla Torre, Catalog. Hymen. VII, 1893 p. 182. 
Lasius umbratus subsp. miztus var. aphidicola Emery, Zool. Jahrb. Abth. f. 
Syst. VII, 1893, p. 640, 641, worker Q co; Wheeler, Bull. Amer. Mus. Nat. 
Hist. X XI, 1905, p. 397; Occas. Papers Bost. Soc. Nat. Hist. VII, 7, 1906, p.13. 
Lasius speculiventris Wheeler, Bull. Amer. Mus. Nat. Hist. X XI, 1905, p. 397. 
Worker. Length 3.5-4.5 mm. 
Brownish yellow, with the appendages, lower portion of the body and anterior 
portion of the head paler. Surface, especially the dorsum of the gaster shining, 
owing to the short and dilute, though distinct pubescence. Hairs erect, coarse 
and rather abundant, short on the gaster, absent on the scapes and legs. Petiole 
seen from behind with rounded or subangular sides and the notch in the upper 
border variable, but usually feeble. 
