GEAPEVI2STE FLEA-BEETLES. 



11 



DURATION OF CALLOW PERIOD. 



The duration of the callow period of the adult stage varied from 1 

 to 4 days with an average of 2 days. The records are summarized in 

 Table XI. Records on this period extended from July 24 to August 4. 



SUMMARY. 



Table VI. — Second larval stage of 

 A. chalybea, North East, Pa., 

 1917. - 



There is only one generation annually, winter being passed in the 

 adult stage. Beetles emerge from hibernation when the grape buds 

 are swelling and oviposition begins soon 

 after and continues until about the middle 

 of June, a few days before the latest 

 adults disappear. 



The average duration of the incubation 

 period in 1917 was 15.18 days. 



The larval feeding period averaged 

 24.26 days in 1917. Records of feeding 

 larvae began June 4 and continued until 

 July 20. The duration of the differ- 

 ent larval stages was as follows: First 

 stage, 8.74 days in 1917; second stage, 

 6.95 days in 1917; third stage, 7.75 

 days in 1916 and 8.53 days in 1917. 



The duration of the period in the ground averaged 20.71 days in 

 1916 and 19.24 days in 1917. Records taken during the two years 



on the transformations of this beetle 



Number 

 of larvae. 



Duration 

 of stage. 



3 



18 

 26 

 8 

 3 

 1 

 1 



Days. 



5 



6 



7 



8 



9 

 10 

 11 



160 



2 6.95 



i Total. 



2 Weighted average. 



Table VII. — Feeding period of 

 third larval stage, A. chalybea, 

 North East, Pa., 1917. 



Number 



Duration 



of larvae. 



of stage. 





Days. 



1 



5 



6 



6 



10 



7 



5 



8 



10 



9 



11 



10 



2 



12 



2 



13 



147 



2 8. 53 



i Total. 



2 Weighted average. 



while in the ground extended from June 

 22 to August 4. The duration of the dif- 

 ferent stages in the ground in 1917 was 

 as follows: Prepupa 9.17 days, pupa 8.47 

 days, callow adult 2 days. 



THE LESSER GRAPEVINE FLEA-BEETLE. 



(Altica woodsi n. sp.) 



The specific name A. woodsi is given in 

 recognition of Mr. Woods's recent sys- 

 tematic and biological studies of mem- 

 bers of the genus Altica (25, 26), and 

 because he is the first to record what is 



probably this insect as a new species. 



DESCRIPTION OF STAGES. 



THE ADULT. 

 PI. II, D. 



This beetle is similar to Altica chalybea, from which it may be distinguished as fol- 

 lows: Color metallic green, rarely with purple or olivacious reflections; antennal 

 joint 3 equal in length to joint 4; average length 3.05 mm., varying from 2.43 to 3.05 

 mm. 



