1910] Wheeler—North American Forms of Lasius umbratus 241 
Emery cites aphidicola also from Caldwell, N. J., District of 
Columbia and Virginia. According to this authority, aphidicola 
is so close to the European miztus as to be scarcely distinguish- 
able. The color of the worker of the American form is usually 
darker, and the body and wing color of the female is decidedly 
deeper. Worker forms are sometimes found with a few, scattered 
erect hairs on the antennal scapes and tibiz and therefore repre- 
sent transitions to the typical wmbratus. 
3. Lasius umbratus minutus Emery. 
Lasius umbratus var. bicornis Mayr, Verh. zool.-bot. Ges. Wien, XXXVI, 
1886, p. 430. 
Lasius umbratus subsp. minutus Emery, Zool. Jahrb. Abth. f. Syst. VII, 1893, 
p. 641, worker 2 oc; Wheeler, Bull. Amer. Mus. Nat. Hist. XXI, 1905, 
p. 397; Occas. Papers Bost. Soc. Nat. Hist. VII, 7, 1906, p. 13. 
Worker. Length 3-3.5 mm. 
Brown, with the cheeks, clypeus, mandibles, appendages and lower surface of 
the body more yellowish. Body so densely pubescent that its shining surface is 
obscured and appears glossy or subopaque. Hairs on the head, thorax and gaster 
abundant, erect and coarse, on the gaster longer and more conspicuous than in the 
two preceding subspecies. Scapes and legs naked; lower surfaces of the femora 
with a few scattered, erect hairs. Petiole high and narrow, with straight sides and 
a distinct notch in the apical border. 
Female. Length 4—4.5 mm. 
Dark brown; mandibles, mouthparts and appendages, except the middle por- 
tions of the femora, pale brown; wings gray with infuscated bases. Pubescence 
and pilosity very similar to those of the worker, but longer. Petiole more feebly 
notched. 
Male. Length 2.6-3.5 mm. 
Black; with piceous legs and antennze. Wings colored like those of the female. 
Mandibles with two apical and no basal teeth. Pubescence and pilosity like those 
of the worker, but the former more dilute, so that the surface of the body is more 
shining. Discoidal cell of the wing often incomplete or lacking. 
The type specimens described by Emery came from New 
Jersey and Maine. I have examined specimens from the follow- 
ing states: 
New Jersey: Cotypes (T. Pergande). 
Maryland: Chestertown (E. G. Vanatta). 
Illinois: Rockford (Wheeler). 
