CLOVER-LEAP WEEVIL. 



9 



and observations made by different members of the Burean of Ento- 

 mology would indicate that ovipositing beetles in the latitude south 

 of- southern Indiana are capable of laying fertile eggs in the spring 

 and that two broods sometimes, if nor ordinarily, occur annually. 



The larvae have often been observed feeding during the mild days 

 of winter on the small leaves at the crown of the clover plant. In 

 the early spring the larvae commence to feed as soon as the clover 

 starts its growth, but feeding and growth are intermittent, due to 

 climatic changes, so that larvae of all stages may be found during 

 April and May. Larvae in the first three instars are most numerous 

 in April, but beginning with May there is a gradual falling off in 

 numbers of larvae in the first two instars, those in the third and 

 fourth predominating. By the end of May few active larvae remain 

 and by June 20 practically all have completed their growth and spun 

 their pupal cocoon. Tables II and III give the number of days 

 passed in different stages and the dates of their occurrence in the 



field. 



Table II. — Hypera punctata: Length of larval and pupal periods. 



Stage. 



Number ,,. . 

 of exam- ^™" 

 ples. mum - 



Maxi- 

 mum. 



Aver- 

 age. . 







6 



19 

 23 

 32 

 57 

 44 

 53 

 56 



Days. 

 17 

 4 



4 

 8 

 1 

 1 

 5 

 1 



Days. 

 20 

 15 

 13 



21 

 2 



10 

 16 

 5 



Days. 

 185 











S\ 



Larva 









1+ 













Length of timer 







2§ 







Table 



III. — Hypera punctata: Stages 



occurring in field at different dates. 



Date collected. 



First 

 stage. 



Second 

 stage. 



Third 

 stage. 



Fourth 

 stage. 



Pre- 

 pupa. 



Pupa. 



Oct. 14 



1915. 



2 

 2 

 1 













Oct. 19 



3 









Oct. 20 







Oct. 21 



1 



3 









Oct. 22 



1 1 







Oct. 27 



18 : .2 











19 19 

 18 45 



32 34 



6 7 



33 28 



2 , l 

 14 







Nov. 23 





Dec. 13 



13 









1916. 



1 

 5 

 4 

 4 







Jan. 28 











3 

 6 

 6 

 4 

 3 

 15 

 4 

 2 



1 









1 





Apr. 3 





4 



l 





Apr. 5 





2 



2 9. 





Apr. 10 





2 



12 

 1 



1 











10 



4 





Apr. 18 







Apr. 20 





3 





Apr. 27 





2 5 

 2 11 





May 8 





14 14 



May 18 













2 i 



May 26 





4 











15131° 



—20— Bull. 922 2 















