506 ENTOMOLOGICAL SOCIETY 



figs, this number was reduced in the second generation to the 

 inhabitants of not more than 150 or 200 figs, each of these small 

 figs harboring, in the average, not more than about 75 specimens 

 of Blastophaga. 



The imagoes of this weak generation issued between August 12 

 and September 13, and since at that time a tolerably large num 

 ber of young figs are available for oviposition, the succeeding or 

 third generation of Blastophaga becomes again quite numerous in 

 specimens. 



Once more the Blastophagas were seen on the wing, and the 

 larger portion of the imagoes of the third generation issued from 

 October 5 to November 10, when the observations were discon 

 tinued, the females ovipositing in and forming a fourth genera 

 tion in the latest Caprifigs of the season. At thistime, however, the 

 Caprifig trees develop only a very limited number of young figs, 

 and many thousands of Blastophagas fail to find figs for oviposi 

 tion. 



The cold weather of the approaching winter arrests an)' further 

 development of both Caprifigs and insects, and the Blastophaga, 

 partly belonging to the third generation and partly to the fourth 

 generation, hibernates in any of its stages. 



THE BLASTOPHAGA AT NILES, CAL. 



Nothing can illustrate more forcibly the great diversity of cli 

 matic conditions prevailing in California, than the experience 

 obtained with the Blastophaga during the year 1900. Early in 

 April of this year, some winter figs containing the Blastophaga 

 were sent from Fresno to the well-know r n horticulturist, Mr. John 

 Rock, who has a'number of Italian Caprifig trees in his magnifi 

 cent arboretum of fig trees at Niles, Cal., only 170 miles north 

 of Fresno. This attempt of establishing a second colony of 

 Blastophaga in California was eminently successful, but instead 

 of the four generations annually observed at Fresno, the insect un 

 derwent only two generations at Niles. The imagoes of the first 

 generation did not issue before the end of July, the latest date of 

 issue being September 2.* The ensuing second generation, ob 

 served only on a single tree,| did not mature to imagoes in the 

 fall and will no doubt successfully overwinter. 



A couple of Caprifigs containing insects of the first generation, 

 were re-imported from Niles into the hot summer climate of 



*This date has been kindly furnished by Mr. G. P. Rixford, of the Cali 

 fornia Academy of Sciences. 



tThis magnificent tree originally purchased by Mr. John Rock from 

 Dalmatia as an Adriatic fig tree, has been baptised by Mr. Rock, Dr. G. 

 Eisen, and the writer as the "Endrich Capri tree." 



