THE CONCHUELA. 
33 
In order to show in a more graphic manner the vitality of the 
females collected at various times during the year, the data con- 
cerning that sex are arranged in the form presented below: 
Table X. — Longevity of adult females of tf>< conchuela collected infield. 
Number 
Number alive in sucessive months.** 
When collected. 
Y\ here collected. 
of speci- 
meDS - July. 
Sept. 
Oct. 
Nov. 
Dec. 
190'). 
Julv iv-10. . . 
Tlahualilo, Durango, Mexico 
Barstow. Tex 
21 21 
20 
13 
4 
11 
5 
7 
1 
5 
10 
1 
2 
10 

August 11-12 
68 
c 14 

September 12 
September 19 
October 13 
do 

o 
Barstow, Tex 
10 
rflO 
a Record on the first day of each month following that during which collection was made. 
t> Not including *> which died in less than five days after irip from Barstow to Dallas. Tex. 
c Not including 2 which died in less than five days after trip from Barstow to Dallas. Tex. 
d Hibernating alive December 19. 
All of the above records on the duration of adult life are incom- 
plete, as it was not definitely known in any case how long the insect 
had been in the adult stage when collected. Conditions at Tlahua- 
lilo indicate that the specimens collected at that point had been in 
the adult stage, on the average, about ten or twelve days. There 
were no means of judging on this point in the case of the specimens 
collected during August and September, but those collected on 
October 13 were still soft and specimens which died in transit 
contained no recognizable eggs; hence with little doubt this lot of 
specimens had matured within the week preceding their collection. 
Adults reared to maturity in the laboratory. — As will be explained 
under the subject of the molting of nymphs, imperfect or crippled 
adults are frequently produced in the laboratory. From the ten 
apparently normal adults which reached maturity in confinement 
the most complete records on longevity were obtained. 
Table XI.— Summary of records of longevity of adults of the conchuela which reached 
maturity in laboratory. 
Number of 
specimens. 
Where collected. 
When mature. 
Maximum 
longevity. 
Average 
longevity. 
9 
l 
6" 
1 
Tlahualilo. Durango, Mexico. 
<io 
Julv 21 
«49+ 
<J 
• 
2 
July 29 and August 4. . 
August 7 and 14 
Augusl 15 and 16 
9 
2 
Barstow. Tex 
do 
'• 1 '" • 
2 
2 
o Specimens lost. 
6 Used in hibernation test December 1. 1905; alive December I 
From the data given in the foregoing tables we are able to esti- 
mate approximately the length o( adult life o( the conchuela under 
22348— Bull. 86—10 3 
