, . 107 



Psyll se současně rozšiřovati nemohou, můžeme důvodně sou- 

 diti, že vlastní výživná rostlina naší Triozy jest dosud neznáma 

 a bude to asi některý jiný Severní Americe vlastní druh a ne 

 Capsicum, které původně pochází z Ameriky Jižní; přestěhováním 

 se na rostlinu kulturní stala se naše Trioza nyní i hospodářsky 

 závadnou. 



Jedince k popisu a bionomická data o nich mi laskavě 

 poslal jich vlastní sběratel pan prof. T. D. A. Cockerell, prof. 

 University of Colorado, Boulder Colo. Spojené Státy Severo- 

 americké. 



Summary. 



Trioza cockerelli n sp., 



a novelty from North America, being 

 also of economic importance. 



(With one table in the text.) 

 By Dr, Karel Šulc. 

 Ostrava— Michálkovice, Moravia. 

 Head.-Breadth of the vertex behind betvveen the eyes, 

 0,34 mm, with the eyes 0,52 mm, the length along the middle- 

 line 0,16 mm, posterior margin of the vertex regularly and 

 slightly excised, posterior angles slightly truncate, the anterior 

 ones broadly rounded; a medián line divides the vertex in two 

 halves, either shovving a distinct fovea in the middle. Anten- 

 nae filiform 1 mm long in all; the length of single joints is : 

 of the pt, 2"d, Qth and 10*^ 0,05 mm, of the S^d 0,18 wm, 6^^ 

 0,13 mm, 7^^ 0,15 mm, and 8^^ 0,12 mm; smellorgans present on 

 the joints 2, 4, 6, 8, 9; that on the 4^^ joint is very peculiar 

 being in form of a hoUow balí with a circular openig covered 

 with a spoonshaped movable operculum: the other smellorgans 

 show the form of simple pits. The 3 basal joints of the anten- 

 nae are yellow, the 4*^— 8^^ yellow, brown at their ends, the 

 2 last black. Frontal lobes very short 0,06 mm only long, 

 rounded at the apex. Clypeus in the form of a pearhalf and not 

 produced anteriorly. Colours of the head: the ground yellow- 

 white, in the middle of the vertex a horseshoe-shaped large 

 brown spot, the middleline of the vertex and the frontal lobes 

 dark brown, the apex of the latter being lighter, clypeus yello. 

 wish white. 



