346 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
of New Jersey. . . . The species was heard there in the 
daytime giving at long intervals a brief note 'zzikk' much as has 
been observed in Sc. pistillata; at night it was often to be heard 
giving single or a succession of rather resonant and loud 
stridulations." 
Scudder states that "it is more noisy by night than by day; 
and the songs differ considerably at these two times. The day 
song is given only during sunshine, the other by night and in 
cloudy weather. I first noticed this while watching one of the 
little creatures close beside me; as a cloud passed over the sun 
he suddenly changed his note to one with which I was already 
familiar, but without knowing to what insect it belonged. At the 
same time all the individuals around me, whose similar day song 
I had heard, began to respond with the night cry ; the cloud passed 
away, and the original note was resumed on all sides. Judging 
that they preferred the night song to that of the day, from their 
increased stridulation during the former period, I imitated the 
night song during the sunshine, and obtained an immediate 
response in the same language. The experiment proved that the 
insects could hear as well as sing. . . . The note by day is 
bzrwi and lasts for one-third of a second. The night song con- 
sists of a repetition, ordinarily eight times, of a note which sounds 
like tchw. It is repeated at the rate of five times in three-quarters 
of a second, making each note half the length of the day note." 
Northern Curve-tailed Bush-katydid. 
Scudderia curvicauda borealis Rehn and Hebard. 
Plate 14, fig. 7. 
Scudderia curvicauda borealis Rehn and Hebard, Trans. Amer. Ent. Soc, 
vol. 40, p. 281 (1914). 
Measurements. 
Total Body Teg. L. Teg. W. Wgs.>Teg. H. fern. Pron. Ant. Ovip. 
Male . . 36-40 17-19 2&-29 6.5-7 4.5-5.5 20.5-23 5 -5.5 30 + 
Female. 35-37 18-21 25-26 6 -6.5 4 -4.5 21-21.5 5.2-5.5 30+ 7 mm. 
This is a small boreal race of the common Curve-tailed Bush- 
katydid and inhabits the northern part of the country from east- 
ern Maine to Manitoba. Continued collecting will probably 
reveal its presence in much of the Canadian Zone. The half 
dozen specimens in my collection were captured on cold, heath- 
