THE CONCHUELA. 



33 



In order to show in a more graphic manner the vitaHty 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 the conchuela collected infield. 





Where collected. 



Number 

 of speci- 

 mens. 



Number alive in sucessive months, a 



When collected. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



1905. 

 July 6-10 



Tlahualilo, Durango, Mexico 



21 



68 



ci4 



5 



10 



21 



20 



8 



13 

 4 



14 

 5 



7 

 1 

 6 

 5 

 10 



4 

 1 

 

 2 

 10 







August 11-12 



September 12 







do 







September 19 



October 13 



Clarendon Tex 











Barstow, Tex 







d 10 















a Record on the first day of each month following that during which collection was made. 

 b Not including 6 which died in less than five days after trip 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 tlie 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. 



(Days.) 



Average 



longevity. 



(Days.) 



, * 



1 



Tlahualilo, Durango, Mexico. 

 do 



1905. 

 July 21 



9 



«4 9+ 

 &143+ 

 6 127+ 

 6 126+ 



a 49+ 

 "'69"" 



9 



^ 



2 



July 29 and August 4. . 



August 7 and 14 



August 15 and 16 



86+ 

 76+ 

 71+ 





2 





Barstow, Tex 





2 



2 



do 



53 









o Specimens lost. 



6 Used in hibernation tevSt December 1, 1905; alive December 19, 1905. 



From the- data given in the foregoing tables we are able to esti- 

 mate approximately the length of adult life of the conchuela under 

 22348— Bull. 86—10 3 



