314 



of the plants "bore four seed-pods, wliile upon tlie other were two. dozen 

 of these pods, each containing i^erfect seeds. The '• march of i^rogress '' 

 had obliterated the remaining three plants which I had inclosed in 

 sacks, the plants having been uprooted and burned in order to give 

 place to an olive grove. In the case of the two plants above mentioned. 

 i:)ollination had evidently been brotight about by the repeated blowing 

 of the sacks against the expanded tlowers. In natiu-e, of course, no 

 condition like this exists, and it therefore seems very evident that, 

 but for the kindly oflice performed by the Pronuba, Yucca icliipplei could 

 not exist. 



THE COCOANUT AND GUAVA MEALY- WING. 



(Aleurodicus vocois Cartis.) 



jO- 



Tig. 39. — Aleurodicus cocois Curt.: a, adult female: &, side view of abdomen: c, dorsal view of 

 same; d, antenna; <?, head from side; /, costa of front wing; g. costa of hind wing: li, tarsns: 

 i, pul\-illus; A", adalt male; I. claspers — a, Ic enlarged: others still more enlarged (original). 



Tender his well known pseudonym ^'Euricola." John Curtis described 

 in the Gardeners' Chronicle for May 2, 1SI5, a new Aleyrodid from the 

 leaves of the Oocoanut trees in Barbadoes. The specimens were sent him 

 by Sir Eobert Schomburgk, who stated that to its work is attributed a 

 widespread disease of the cocoanut which at that time threatened to 

 destroj' all of the trees on the island. The disease showed itself after the 

 fatal hurricane of 1831, and at the time of writing there were few trees not 

 affected by it. Cocoanut i)lantations which formerly yielded an income 



