148 Proceedings of the Royal Physical Society. 
SUMMARY OF LABORATORY OBSERVATIONS ON H. ATER, 
7th October 1915 
to 24th April 1916 
26th to 27th April Hylastes introduced into breeding-cage. 
} Adults and larvee feeding ; larvee pupated 18th April. 
lst May . Boring begun by 1 pair. 
Std May ... . 95 pairs boring. 
8th May. . Crutch of gallery completed, and gallery proper 1 inch 
long. In others only the crutch is completed. : 
tith May... . Galleries proper 3 inch to 14 inch long. First batch 
of 5 eggs laid. 3 | | : 
22nd May . . Galleries 2 inches to 3 inches long. 20 eggs laid and 
5 hatched. 
24th May. . Larvee and eggs in all galleries. 
30th May. . Galleries 5} inches to 5 inches long. 
doth June. . some larvee well grown. | 
15th June . Do. do. 
19th June. . Full-grown larve. Egg-laying still in progress. 
Sra dulye |: . Larve resting prior to pupation ; athe feeding. 
15th July. a te Do. do. 
20th July. . Pupe, larve resting, larvee feeding. 
Sist uly . Adult but still pale beetles; pupe and larve. 
Srd August . : Do. do. : 
10th August . New series of experiments started. | | 
Cage 1. Parent beetles only. 
Cage 2. Young brood only. 
Cage 3. Parents and young brood together. 
16th August . Beetles in all 3 cages feeding. 
21st August , . Beetles in Cage 1 cutting typical crutch. 
Beetles in other cages feeding. 
29th August . Beetlesin Cage 1 egg laying. Young brood in Cages 2 and 
3 feeding. Parents in Cage 3 cutting brood-galleries. 
7th September . Cage 1. Roots showing eggs and larve. | 
Cage 2. Beetles feeding. ~ | 
Cage 3. Eggs and larve and young brood feeding. 
.18th September . Dia. do. 
29th September . | Do, do. 
12th October . Cages 1 and 3 show larve. 
Cages 2 and 3 (young brood) beetles feeding. ig 
20th October Do. do. 
31st October ; Do, do, 
f . " Sema 
wm P > Aa Me? # ey 
eet ce ?e ye 
