Viii. 



ILiISX OF lULUSXItATIOI^S. 



(dark variety.) 

 La (iuayra, Venezuela. 

 Colombia. 



J^'anama. Canal Zone. 

 Costa Rica. 

 Mexico. 

 Uomi'nica. 

 Triuidad. 

 Surinam. 



Cuba. 

 Trinidad. 



(female.) 

 (male.) 



PLATES. 

 Plate I. Froghoppers ot Economic Importance in Cential America. 



(1) T. sarcharina, Dint. Trinidad (light female.) 



(2) ,, „ „ (light male.) 



(3) ,, ,, ,, (dark female.) 



(4) ,, ,, ,, (dark male.) 



(5) T. flavilatera. Uricli. British (iuiana. 



(6) T. bodkini British Ouiana. 



(7) 7'. rxirmodyi, Kershaw. Tobago. 



(8) „ 



(9) T. projjinqua, ^A alk. 



(10) T. hogotensis, Dist. 



(11) T. lenidior, Fowler. 



(12) T. sp. 



(13) T. postica, Walk. 



(14) T. dominicana, Dist. 



(15) T. puhescenfi, Fabr. 



(16) T. tristis, Fabr. 



(17) „ 



(18) T. bicincta, Ha.y. 



(19) T. rubra, Linn. 



Leaf Injuries to Cane f njni Various Causes. 



(1) Frogh ipper, (a) young streak {b) older streak (c) fully 

 developed streak. 



(2) Ring-spot Fungus (Lepto>iphieria.) 



(3) Eye-spot Fungus [Hdminthosporium.) 



Froghopper nymphs in froth at base of cane stool. 



Stool very badly damaged by blight, dead leaves removed. 



Stool less damaged by blight. 



Stool damaged by blight, dissected into component parts. 



Mycelium of MarasmiuH Root-fungus. 

 Plate VIII. Fruiting Stage of Marasmius Root fungus. 

 Plate IX. Mycelium of Himantia Koot-fungus. 

 Plate X. Fruiting stage of Odonlia Root-fungus. 

 Plate XI. Canes damaged by artilicial removal of leaves (6 and c) with 



undamaged canes (a) for comparison. 



Plate II. 



Plate III. 

 Plate IV. 

 Plate V. 

 Plate VI. 

 Plate VII 



TEXT FIGURES. 



Fig. 1 Monthly rainfall, Trinidad liotanic (j-ardeus, average of fifty- 

 three years. 

 Fig. 2 Map of Triuidad showing approximate positions of the three 



mountain ranges and the three chief sugar growing distiicts. 

 Fig. 3 Diagram of lengths of internodes in cane damaged by two broods 



of froghoppers in 1919. 

 Fig. 4 Diagrams of efficiency of green leaves of damaged and undamaged 



canes. For explanation see text. 

 Fig. 5 Numbers of froghoppers caught by light traps, on one night per 



week, at La Fortun^e Estate 1918. 

 Fig. 6 Numbers of froghoppers caught by light traps, on one night per 



week, at Caroni Estate 1919. 

 Fig. 7 Diagram of intensity of Blight during the years 1906-1919 showing 



the periodic nature of its occurrence. 



