a 
= 
A STUDY OF COMPSILURA CONCINNATA. 19 
EFFECT OF TEMPERATURE UPON VARIOUS STAGES OF COMPSILURA CONCINNATA. 
Temperature, under laboratory conditions, appears to exert little 
influence in the development of larvee within the host. This is par- 
ticularly true during the summer season. In the late summer the 
larva stage is lengthened, but in averaging the whole season when 
Compsilura larvee were secured, July 13 to August 24, it was found 
that the larva stage was lengthened at a time when there was very 
little variation in average temperature. (See Table VII.) 
TABLE VII.—E£ffect of temperature upon length of larva stage of Compsilura 
concinnata under laboratory conditions, Melrose Highlands, Mass., 1916. 
é Average Average 
Number of individuals. Larva tempera- Number of individuals. enn tempera- 
stage. aa stage. 
: ‘ture. 
Days. ciel Days. be 
1 ike dat ek eet Shae ab lee pe st 6 TD GNI Nee ee are eve Sere Ta ere 11 il 
“BPRS ORS See eee, oe oe | 7 PUAN es AS UHR a EEA A oe 14 74 
MO SA a TE ae Sak teeta toe | 8 Od lt cem acer ome een hae Ue 15 71 
i Sg tag i ie ee ee | 9 UPN CN Len aes Sane come Se ROLES 16 71 
Dei ge Se epee eet eae | 10 72 
This average temperature, as noted in Table VII, was secured by 
taking four readings a day and averaging the whole. 
The effect of temperature upon the pupa stage is shown in Table 
WALT. 
Taste VIII.—ELffect of temperature upon length of pupa stage of Compsilura 
concinnata under laboratory conditions, Melrose Highlands, Mass., 1916. 
Average Average. 
Number of individuals. eupa tempera- Number of individuals Jue tempera- 
Be. ture. _ Stage: ture. 
Days. ile Days. 86 
Bete ene soe oe ce skie os 7 AS aee Ree eeSACeer ae Secetaar 15 66 
De AMEE SARE ADD SA SESE. tee 9 OT ike BARES AS SecLAe ll  Sec es mele Res ae 16 64 
Me ee ere ea On Cera 10 (OA SS eR Oe Sees aoe ene Ae 17 64 
Goer a's o oEE See ee wee aes see il EIS QPRNS S Sched Semone eet ecced eter 18 66 
1G SSE Re CeCe ae EASE Ate cease 12 (0 a Seas G ogee aera OCn eae arc x 19 63 
ABs Sota Ae hee 13 GOAT EG. fa 5 Seton: feel At ace 20 ¢3 
SR ETE EE ha EES A lage | 14 68 
Temperature averages shown in Table VIII were secured in the 
same way as for the larva stage. The shorter pupal periods were 
observed in the middle of the summer and those of longer duration 
in the late summer and early fall. All of these records were made 
from puparia above ground, the length of the pupa period in those 
below the surface of the soil being from two to four days greater. 
The effects of temperature on adult Compsilura are shown in figure 
10. The temperature was determined by readings at noon each day, 
when observations were made on the activity of the adults. It is 
practically impossible to rate terms of activity in either degrees or 
percentages, so the following terms were adopted: (1) Very active. 
