505 



v.\N Hall (C. J. J.). De Bescherming der Cultuurgewassen tegen 



nieuwe Ziekten en Plagen uit het Buitenland. [The Protection 



of Cultivated Plants against new Diseases and Pests from Abroad.] 



■Tijdschr. Teysmnnnia, Batavia, ii, 1918, pp 62-95. [Received 



11th September 1918.] 



The title indicates the scope of this paper, which is a resume of 

 present day knowledge on the subject. In the Dutch East Indies 

 the importation of sugar-cane, tea seed and fresh fruit from Austraha, 

 and coffee seed from America, is imder legislative safeguards, but a 

 more general control of imported seeds and plants is required. 



Watson (J. R.). Thysanoptera of Florida. — Florida Buggist, Gaines- 

 ville, i, no. 4, & ii, no. 1, 21st March and 22nd June 1918, 

 pp. 53-77. [Received 24th September 1918.] 



All thrips are of potential economic importance, most of the species 

 being plant feeders, while some are predatory on other small insects 

 and mites, one Florida species feeding on the eggs and larvae of white- 

 fly [Aleurodes sp.]. In Florida they do not hibernate, though they 

 remain quiescent dming the cold weather ; further north they hibernate 

 in either the adult, egg, or larval stage. 



A preliminary hst of 52 species recorded as occurring in Florida is 

 given, with notes on their distribution, food-plants, season and habits. 

 These include : — Aeolothrips floridensis, Wats., a comparatively rare 

 species, taken on oats and maize, always associated with A. hicolor. 

 Hinds (black and white cereal thrips) often abundant on oats in spring, 

 causing material damage, and also recorded fi'om Plantago virginica, 

 onions, rutabaga, strawberries and citrus ; FranJclinothrips vespifonnis, 

 Crawf., on citrus leaves ; Thrips tabaci, Lind. (onion thrips), cosmo- 

 politan in its distribution, being the most serious pest of onions in the 

 State, doing great damage annually and also recorded on cabbage, 

 cauliflower, and crabgrass {Pauicum sangiiinale) ; Heliotkrips 

 kaemorrkoidalis, Bch. (greenhouse thrips), common in Florida in. 

 gardens and on ornamental plants, but in the northern States confined 

 to greenhouses, also recorded on mango, avocado and the foliage of 

 Acer rubrum ; H. rubrocinctus, Giard (red-banded thrips) on avocado 

 and mangos, a severe pest of the latter, causing the leaves to lose 

 colour and fall, introduced from the West Indies ; Limothrips cerealium, 

 Hal. (cereal thrips), on oats, widely distributed and occurring also in 

 Europe ; Chirotkrips manicatus, Hal., also widely distributed on oats ; 

 Scolothrips sextnaculatus, Perg., found feeding on red-spider and also 

 in the Hawaiian Islands ; Frank] iniella fusca, Hinds (tobacco thrips), 

 on tobacco, peanuts, sorrel, dewberry, mustard, shepherd's purse, 

 turnips and strawberries; F. floridana, sp. n., on velvet beans 

 {Stizilobium) ; F. occidentalis, Perg., on beans and mango ; 

 F. bispinosus projectus, Wats. (Florida flower thrips), the commonest 

 local species, taken all the year round on a gi-eat variety of plants, 

 all the records in local literature probably referring to this variety or to 

 F. bispinosus, Morg. ; Cryptothrips floridensis, Wats, (camphor thrips), 

 probably an introduced species ; C. citri, sp. n. , found imder the loose 

 bark of a citrus tree affected with gummosis ; and Leptothrips mali, Fitch 

 (black garden thrips), on citrus foliage at all seasons, also on magnolia, 

 beans, coffee-bean, cotton, radishes, mustard, turnips and grasses. 

 (C614) O 



