THE CANADIAN ENTOMOLOGIST 123 



Myzus lycopersici /"Clarke) 

 [Macrosi'phum lycopersici Clarke.) 



This species was first identified by Mr. H. F. Wilson as Ma- 

 cros iphum lycopersici Clarke, from specimens collected on wheat 

 and tomato in Montana, sent him by Prof. R. A. Cooley. The 

 Clarke collection of Aphididse, which contained all his type speci- 

 mens, was destroyed in the San Francisco earthquake and fire, and 

 consequently it was not possible positively to identify the species. 

 The fact that the original description of this species agrees fairly 

 well with the species here described, that it was found not uncom- 

 mon on tomato, the type host, and that it has been found by Mr. 

 Wilson in Oregon, where the fauna is not unlike that of the 

 northern half of California, tend to establish the identity of this 

 species beyond little doubt. 



Wingless viviparous female. 

 (PI. V, fig. 26.) 



Entire body pale lemon-yellow, the head usually whitish 

 yellow, with a more or less distinct longitudinal dorsal median line 

 of pale green colour; also, an area at base of cornicles of a deeper 

 yellow is usually discernible, and often one or more of the red eyes 

 of the young within show through the body wall. Antennae having 

 segments I and II concolorous with head; the remaining segments 

 whitish semitransparent, excepting a faint duskiness at tips of III 

 and IV, the tips of V and of base of VI and the distal third of 

 filament of VI blackish; segments III and filament of VI subequal; 

 total length less than that of the body; one or two circular sensoria 

 near base of segment III and the usual distal ones on V and base of 

 VI. Eyes very dark reddish brown, apparently black under hand 

 lens. Beak not quite reaching to coxae of second pair of legs. Legs 

 whitish, the tips of tibiae brownish and the tarsi dusky to blackish. 

 Cornicles whitish yellow and semitransparent; cylindrical, and 

 reaching a little beyond tip of cauda. Cauda pale yellow or 

 greenish yellow, paler than body colour. 



Average measurements from 8 individuals, alive and in balsam, 

 as follows: Length of body, not including cauda, 1.90 mm.; 



