150 Proceedings of the Royal Physical Society. 
Tabular Summary of Field Observations on H. ater. 
Yeal Jan. | Feb. | Mar. | April] May | June | July | Aug.| Sept. | Oct. | Nov. 
isis © ++4)44+4]4 44 
--6|-©0|-90 
oie a ee elle ee eee 
KORO) OO@e@ ss: ')s —~-|--@O)/--© 
QODD\OOO| peel = OO iO te Oa 
The above tables correspond fairly well with the laboratory results, and 
again show adults and larvee all the year round with the egg and pupal 
stages occurring In summer. 
SUMMARY OF LABORATORY OBSERVATIONS ON H. PALLIATUS. 
2nd May . 
4th May . 
Sth May . 
12th May 
18th May 
22nd May 
30th May 
5th June . 
13th June 
17th June 
19th June 
23rd June 
Ist July . 
ord July . 
10th July 
13th July 
17th July 
20th July 
40 adults placed on Scots pine stems 2 feet long. 
Numerous borings in logs; many in close proximity. 
First stem examined. Some beetles still feeding. 
2 pairs cutting galleries. 1 gallery contains eggs. 
3 galleries containing eggs; 2 also contain newly-hatched 
larvee. 
Galleries contain eggs and larve. 
Do. do. 
Eggs and larvee. Some of the larvee apparently full grown. 
Larvee and pupe. 
Larvie, pups, and pale adults. 
Brown and pale adults, larve, and pupe. 
Do. do. 4 
Young adults feeding; some crawling about on the surface 
of the stems. 
All adults—old and young—removed to fresh stems. Larvee 
and pupeze left to emerge. 
All adults feeding. 
Larve pupating and pup emerging. 
Adults feeding. 
Larve pupated ; pup emerged. 
All young brood now in adult stage. 
Late emerged adults transferred to fresh stems. 
(a) Old adults cutting brood-galleries. — 
(6) Young adults feeding. 
(a) Eggs and newly-hatched larve. 
(0) Young adults still feeding. 
