D86 VICTOR E. SHELFORD 
TABLE 10 
Showing the comparative meteorological conditions in Chicago and Brandon (28 
miles northwest from Aweme) during active period of tiger beetles, April to Septem- 
ber, and during the time of digging hibernation burrows (September ) 
. ea 2 Ge si 
a 3 ae eee 
ey ae am 4m uy . 
5 5 as aS) BS o¢ ve 5 
Be aye aa Z =< Bi <8 Ze 2 
=; tay & pS aL 25 a & = 
a Do a SIS S MB ae Zz 
2 Za ra oe a Aw 5A G 
AS De Sa & < = <= as = 
z e 7a) 4 a 3 fe) > Tg Ea) = 2 & 
Ba Ae 7% ° Zw zu ze S 
2p <A < m zie) ab <8 <8 BS 
>i) A < B< ae ged go gm eB 
et & = rt = = = a 
in hrs. deg. percent deg. deg. deg. in. 
about 
Chicacou naa 19.3 1695 70 | 100 43 4 71 a7 33.4 
1BRRHNGKOIM pncn ee seonc, oti 1510 68 SO 33 66.4 | 38 17.45 
On comparison of the data for the two points in question in table 
10, we see that the amount of rainfall, the extremes of temperature 
and the length of season as well as the amount of sunshine differs 
widely at Chicago and in the vicinity of Aweme, Manitoba. 
Comparing these data with those found in table 9, we note that 
the larval burrows are deeper in the climate which is most arid 
and coldest in winter. Likewise the depth of the hibernation 
burrows is greatest where the temperature is lowest during the 
period of digging. 
The shorter season, fewer hours of sunshine, and drought 
accompanied by the periods of inact vity described by Criddle 
may be the cause of the longer ife-histories referred to in the case 
of the three species especially considered here. 
C.. GENERAL CONSIDERATIONS 
We have noted various features of tiger beetle behavior. A 
discussion of the general bearing of this will now bepresented 
under the following heads: (1) Importance of the breeding in- 
stincts and breeding place, (2) the relation of behavior characters 
to habitat and associated forms, (3) the meaning of variation 
in behavior, (4) relation of local and geographic distribution; 
importance of various factors. 
