152 
SUMMARY OF FIELD OBSERVATIONS ON H. PALLIATUS. 
Month Locality Stages Remarks 
October Aberdeenshire eats a Adults recently emerged, feeding in 
close proximity to their pupal 
chambers. 
Kincardineshire Parkas Adults feeding on Scots pine logs in 
company with larve of Pissodes pint. 
Fifeshire +++---@ | Feeding on 1-year felled Scots pine 
‘| stumps. 
Midlothian tee tae | On l-year stumps, together with M/. 
piniperda. 
Peeblesshire +++-- Feeding on Scots pine stumps in large - 
numbers. 
November | Fifeshire do. On half-fallen Scots pine and larch. 
Forfarshire do. On Scots pine stumps and on fallen 
spruce stems. . 
December | Midlothian do. On 1-year stumps. 
January do. do. do. 
February do. do. do. 
March do. do. Adults feeding on fallen spruce stems 
in company with D. autographus. 
Hylastes occurring on the drier 
; portions, Dryocetes on the wetter. 
April do. +4 2 Adults feeding. 
Peeblesshire do. do. 
May Midlothian +4+—-- Adults swarming. Numbers crawling 
on half-fallen larch and Scots pine, 
and others with wing-covers project- 
ing out of the bark, busy boring. 
No eggs. 
do. ib ae Some adults still feeding, others busy 
with their brood-galleries. 
June do. ++--+\+ @ Young lJarve half and full grown. 
July do. ++++—-—©@©@ | Allstages present. Some adults feed- 
ing on Scots pine branches. 
AUgURE iE to: Many adults feeding, others cutting” 
Peeblesshire do. Pood Me 
September do. do. Eggs few in number. 
Proceedings of the Royal Physical Society. 
Tabular Summary of Field Observations on H. palliatus. 
Year | Jan. | Feb. | Mar. | April| May | June | July | Aug. | Sept. | Oct. | Nov. | Dec. 
1915 | +4+4)44+4]/44++4+ 
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| 
_. COMPARISON OF THE LIFE-HISTORIES OF H. ATER AND H.-PALLIATUS. — 
In comparing the life-histories of the two species, I have combined field 
and laboratory observations in the following tables. The reason for this 
