﻿THE CATTLE GKUBS OR OX WAEBLES 



67 



emergence of the adults was 16 to 25 days. All of these records were 

 made in midsummer, and the specimens reared in New York were 

 kept in a building in which the temperature was warmer than out- 

 doors, hence the periods shown are probably shorter than would 

 occur normally. 



Table 9.— Duration of prepupal and pupal stages of Hijpodenna bovis 





Date 

 dropped 



or ex- 

 tracted 



from 



host 



Date 

 pupated 



Dura- 

 tion 

 of 

 pre- 

 pupal 

 stage 



Adults emerged 



Dura- 

 tion 

 of 

 pupal 

 stage 



Period 

 from 

 drop- 

 ping 



to 

 adult 



Temperature 

 during period from 





Date 



Num- 

 ber 

 of 

 males 



Num- 

 ber 

 of fe- 

 males 



dropping to adult 



Locality 



Max. 



Min. 



Aver- 

 age 

 daily 

 mean 



Dallas, Tex 



Do 



1918 

 May 15 

 May 24 

 May 27 



1921 

 June 24 

 July 14 

 July 17 

 Aug. 3 



1922 

 Apr. 20 

 Apr. 21 

 Apr. 23 

 Apr. 26 

 Apr. 28 



...do 



Apr. 29 



...do 



Apr. 30 

 May 4 



...do 



.._do.--- 

 May 8 



...do 



May 12 



__.do 



...do--.. 

 May 14 

 __do 



...do-_.. 

 May 17 



...do 



May 20 



...do 



May 25 

 May 27 



1918 

 May 16 

 May 25 

 May 28 



1921 

 June 24 

 July 15 

 July 17 

 Aug. 4 



1922 

 Apr. 27 



...do 



...do--.. 

 — do--- 

 May 1 



.--do 



...do-..- 



___do 



--_do--.- 

 May 8 



...do 



--do---- 

 May 9 

 May 10 

 May 13 



--do 



--do-..- 

 May 15 



.--do 



-.do--.. 

 May 19 



...do 



May 21 



--.do 



May 26 

 May 29 



Bays 



1 

 1 

 1 



1 



1 



7 

 6 

 4 

 1 

 3 

 3 

 2 

 2 



4 



4 



4 



IV2 



2 



1 



1 



1 



m 



1 



1 



1 



2 



1918 

 May 30 

 June 8 

 June 12 



1921 

 July 11 

 July 30 

 Aug. 5 

 Aug. 28 



1922 

 June 4 



— do.-.- 



— do 



—do-... 



...do--. 



...do.... 



—do.... 

 June 5 

 June 4 

 June 6 

 June 7 

 June 8 

 June 7 

 June 9 

 June 8 

 June 9 

 June 10 

 June 9 

 June 10 

 June 11 



-__do 



June 12 

 June 11 

 June 12 

 June 16 

 June 19 



...... 



1 

 1 

 1 

 1 

 2 

 3 

 1 

 1 

 1 

 1 

 6 

 1 

 5 

 — ... 



3 

 1 

 3 

 1 



2' 

 1 



1 

 1 

 1 



1 

 1 



1 



...... 



1 

 3 

 1 



2 



1 



...... 



1 



1 

 ...... 



- 



— ... 



Days 



14 

 14 

 15 



im 



15 

 24 



38 



38 



38 



38 



34 



34 



34 



35 



33K 



29 



30 



31 



2m 



30 



26 



27 



28 



24H 



25J4 



2m 



23J^ 



21 

 22 

 21 

 21 



Days 



15 

 15 

 16 



+17 



16 



+19 



25 



45 

 44 

 42 

 39 

 37 

 37 

 36 

 37 

 35 

 33 

 34 

 35 

 30 

 32 

 27 

 28 

 29 

 26 

 27 

 28 

 25 

 26 

 22 

 23 

 22 

 23 



98.4 

 96.0 

 97.0 



°F. 

 54.0 

 63.1 

 65.0 



°F. 



78.28 



81.62 



Do 



81.37 



Herkimer, N. Y... 





Do 









Do 









Do 









Middletown, N. Y. 

 Do - 



85.0 

 85.0 

 85.0 

 85.0 

 85.0 

 85.0 

 85.0 

 85.0 

 85.0 

 85.0 

 85.0 

 89.0 

 85.0 

 91.0 

 89.0 

 91.0 

 92.0 

 91.0 

 92.0 

 92.0 

 92.0 

 92.0 

 92.0 

 92.0 

 92.0 

 92.0 



28.0 

 28.0 

 32.0 

 32.0 

 33.0 

 33.0 

 33.0 

 33.0 

 33.0 

 40.0 

 40.0 

 40.0 

 40,0 

 40.0 

 40.0 

 40.0 

 40.0 

 41.0 

 41.0 

 41.0 

 41.0 

 41.0 

 41.0 

 41.0 

 41.0 

 41.0 



58.6 

 59 1 



Do 



60.0 



Do 



60.9 



Do . - 



61.4 



Do 



Do 



61.4 

 61.9 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



62.1 

 62.1 

 62.8 

 63.2 

 63.6 

 63.8 

 64.6 

 64.5 

 64.9 

 65.3 

 65.0 



Do .• 



Do 



Do 



65.5 

 65.8 

 66.5 



Do.. 



Do 



66.8 

 67.8 



Do 



Do 



68.2 

 68.3 



Do 



68.1 







' Half days are given to approximate more closely the time required for transformation. 



At Middletown, N, Y., during 1922, a large number of adults were 

 reared from larvae which emerged normally from the backs of cat- 

 tle. These pupse were kept in a screened, roofed insectary out of 

 doors. The prepupal period ranged from about 10 hours to 7 

 days, with an average of 1.7 days; the pupal period, from 21 to 

 38 days with an average of 29.4 days. The time from leaving the 

 host to emergence of adults varied from 22 to 45, witli an average 

 based on 167 records of 31.34 days. Tlie longest period (Table 9) oc- 

 ciin-ed in tlic spring. As some larva; left hosts in 1922 about April 1, 

 it is pi'obable that some periofls longer than the maximum shown 

 might have occnrred among the hu'v^a; dropped earlier in the s])ring. 



In Canada. Hadwcn i-l'i) observed a period of .'M) to 40 days to 

 intervene from the emergence of the larvu; to the appearance of 



