76 
Psyche 
[June-September 
19. Dolichoderus plagiatus Mayr. Waquoit. 
20. D. plagiatus inornatus Wheeler. Chatham. 
21. Tapinoma sessile Say. Woods Hole, Falmouth, East 
Falmouth, Pocasset, Sandwich, Cotuit. 
22. Brachymyrmex heeri depilis Emery. Woods Hole, 
South Orleans. August 22-23. 
23. Prenolepis imparis Say. Woods Hole, Falmouth, 
East Falmouth, Waquoit. August 17. This form is appar- 
ently common, but is not easily found in mid-summer— 
as is also true in the New York region. 
24. P. parvula Mayr. East Falmouth, Pocasset, South 
Wellfleet. August 29. This species is easily overlooked 
and may be commoner than is indicated. 
25. Lasius niger neoniger Emery. Woods Hole, Fal- 
mouth, Falmouth Heights, Chatham, Truro. July 24-Sep- 
tember 3. This form is not clearly distinct from ameri- 
canus in this region. I have identified all the intermediates 
as americanus; I am inclined to suspect that the extreme 
hairy specimens listed here are not really distinct from 
the paler form of americanus referred to below. 
26. L. niger alienus americanus Emery. Woods Hole, 
Falmouth, Falmouth Heights, West Falmouth, East Fal- 
mouth, Pocasset, Sandwich, Hyannis, South Yarmouth, 
South Chatham, Chatham, Brewster, North Eastham, 
South Wellfleet. July 11-September 30. There appear to 
be two distinct forms here — a darker form typically nest- 
ing in stumps and logs in the woods, not found infested 
with Mermithids; and a paler form typically nesting in 
the soil in sunny places (often on the beaches down to 
high-tide level), frequently producing short-winged mermi- 
thogynes (see Wheeler 1928). In the absence of adequate 
series from the Palsearctic region and from the western 
states, I am unable to make a thorough revision of the 
forms of niger — without which it seems to me undesirable 
to describe and name these types. 
