Jfo. I. ] American Blight. 55 



wings, 0-2 inch; 5'08 mill.: size of body, '05 x -025 inch; 1'27 X -62 

 mill. : length of antennse, '025 inch; "62 mill. Uniform colour dusky- 

 brown, approaching to black : pronotum rather paler, abdomen carinated 

 and ringed : antennse short ; third joint long and strongly ringed, the three 

 following joints less markedly so : wings ample and rounded at their 

 apices; membrane smoky and slightly punctured : cubitus broad, ending 

 with a large trapezoidal brown stigma : veins black, cubital vein with a 

 single furcation : legs short. The small sexuated lice produced by this 

 female appear to be born within a pseudovum. They have no rostrum, 

 which is represented by aborted buccal processes, its tive-jointed antennge 

 and the tarsi also are not well developed; the eyes are small and the 

 colour of the ? is yellow, tinged with red. The length of the $ is 

 0-63 mill., and of the $ 0-50 mill. The fact that both male and female 

 in this stage are without the usual sucking organ shows that they exist 

 simply for the propagation of the species, and when that is accomplished, 

 they perish.'^ 



Root inhahiiing form. — Thomas describes the root-inhabiting form 

 called Pemphigus pyri by Fitch thus: — "The young larvse are scarcely 

 0-04 inch long, of an oval form, and pale dull yellow colour : legs short, 

 robust and nearly equal in length : the antennse appear much like a fourth 

 pair of legs and are five-jointed. From the extremity of the abdomen 

 usually appears a white filament of flocculent, cotton-like matter * ^ ^." 



Winged individuals. '—These are nearly quarter of an inch long to the 

 tips of the closed wings ; body, legs and antennse, coal black ; the head 

 and abdomen above covered with cottony down : fore wings transparent 

 and slightly smoky, as though sprinkled with fine dust ; veins black ; 

 the third vein is rather more slender than the first, nearly straight, not 

 forked, its basal third abortive ; stigma dark, smoky brown, oblong ; its 

 ojoposite sides nearly parallel, abruptly conveying to an acute point at 

 each end : hind wings clearer ; the two discoidal veins, black. The 

 winged individuals found in Illinois show some slight variation: — '^^ gen- 

 eral colour, black ; antennse not quite half as long as the body, third joint 

 half as long as the entire antennse ; abdomen more or less sprinkled with 

 white downy matter : wings transparent, third discoidal vein forked 

 near the middle, its basal portion obsolete ; stigma nearly three times as 

 long as it is wide, pointed at each end, and pale brown : length to the 

 tips of the closed wings, about one-seventh of an inch. 



Local Reports. — Mr. Daly writes (August 1889) from Conoor : — ^Mt 

 {S, lanigera) has destroyed nearly every orchard in Conoor.^' ^ * k \ have 

 syringed the trees affected, with the kerosine and soap emulsion, 

 afterwards applying lime and ashes with a little salt. I hope I have 

 not killed the trees. I cannot see any blight now, but some of the leaves 

 look as if fire had been placed to them. A friend tells me that they have 



