50 College of Forestry. 
The egg gallaries are usually transverse (Fig. 28), 
although this is not invariably true, as they are often 
diagonal (Figs. 26, 27) and occasionally, especially when 
the number of egg ‘galleries is great, they may be nearly 
longitudinal. The diameter is just great enough to accom- 
modate the body of the burrowing insect and never large 
enough to allow her to turn around. The length of the 
ege burrows varies greatly as does also the number and 
arrangement of the egg niches in the sides. Thirty egg 
galleries were measured, the length varying from 4 mm. to 
49 m. m., the average being 23.1. 
The number of egg niches in each egg gallery varies 
even more widely. Careful counts were made of 66 gal- 
leries brought in from nature with the following general 
result : 
Minimum number of egg niches to an egg gal- 
ee riict Ke Ge Aa en OREO Por ere sich io 5: 2. 
Vicia mean hh ays Ed 0) See a eae Ae Re SS gr 5 60. 
Average for 66 egg galleries.............. 19% 39 
The number of egg niches does not vary exactly with 
the length of the egg gallery. The smallest number of 
niches (2) was found in the shortest gallery measured, 
which was 4 mm. long, but the greatest number of niches 
(60) was in a gallery 38 mm. long, while the longest gallery 
measured, which was 49 mm. long, had but 37 egg niches. 
In general, however, there is a distinct relation, although not 
an absolute ratio, between the length of the egg galley and 
the number of egg niches. 
The arrangement of the egg niches is by no means as 
regular as it is in many bark beetles. This regular arrange- 
ment seems to be especially characteristic of many mono- 
gamic forms such as the various species of Hecoptogaster. 
A careful study of the egg galleries gives rise to several inter- 
esting deductions regarding the arrangement of the egg 
niches. It is evident that the typical manner is for the 
female to place them alternately first on one side and then on 
the other side of the gallery and if conditions are entirely 
