1946] Athysanus argentatus in New England 5 
dark gray each side. There is usually a black mark at base of 
antenna, and another just above it. The pronotum on hind part 
is finely, transversely striate; there is a brown line each side, 
not reaching front, and a short line in front of wing-base. The 
scutellum has three dark lines, usually visible beneath the pro- 
notum. The abdomen has three black streaks, above and be- 
neath, the median one with irregular edges, the lateral ones 
situate before margin. 
The hind tibiae have a black streak with adjoining dots be- 
low; the mid and front femora have a brown line above and 
another shorter just below it on the front. 
This insect is one of several spiders and insects found in my 
swamp, or near it, that are holarctic; two of the spiders like 
Athysanus, had not been known from Massachusetts until found 
here by Mr. Emerton and myself, and like the Athysanus occur 
in swampy places in North Europe. These forms following the 
retreat of the glacier became trapped in certain pockets where 
conditions were favorable for them. All of these forms are ma- 
ture in early summer, while the several southern forms that I 
find here are mature only in late summer. 
