44. College of Forestry 
nuptial chamber. In most cases such burrows were for feed- 
ing purposes only, with not only the nuptial chamber lacking 
but also with the egg niches omitted. In a few cases where 
the female operating had been removed from a burrow 
already occupied by a male and several females she con- 
structed egg niches in the side of the independent burrow 
and deposited eggs therein, but made nothing resembling 
either a nuptial chamber or a nuptial recess. In fact in 
such burrows it was necessary for her to back out at the 
entrance in order to turn around, no place in the gallery 
being wide enough for this manoeuver. 
Some interesting observations have been made upon the 
proportion of the sexes as they occur in their burrows in 
larch and the bearing of this upon fecundity. This work 
is based on a careful study of fifty engravings and burrows 
—all the uninjured ones available in the material at hand. 
Had more engravings in larch been available they would 
have been used, although it is believed that a study of a 
greater number would not have materially changed the 
general results. 
The following tables based on the study of fifty engravings 
are self-explanatory : 
Number of engravings having one-egg gallery ................ 6 
Number of engravings having two-egg galleries ............... 22 
Number of engravings having three-egg galleries ............. 14 
Number of engravings having four-egg galleries .............. 6 
Number of engravings having five-ege galleries ............... 2 
Total number of ege galleries studied..........:..1.....2% 126 
Minimum slenothwotveroscalliler var seem ieene 4 mm. 
Maximumplenoth otvecsjiealleny.. 7... -/2. asakciac sae omens 60 mm. 
Average! lensthyonesaeallenyenie oc eel  oe)-1e eee 24.55 mm, 
Average length of egg gallery in uniramous type........ *34 mm. 
Average length of egg gallery in biramous type......... 26.36 mm. 
Average length of egg gallery in triramous type......... 22.38 mm. 
Average length of egg gallery in quadriramous type..... 26.37 mm. 
Average length of egg gallery in quinquiramous type.... 18 mm. 
* In one case the single egg gallery measured 60 mm. in length which 
in so small a number would unduly raise the average. If this case is 
left out of consideration the average length would be 28.8. 
