BY R. J. TILLYARD. 227 



a drop of chloroform had been shaken up, and A\a,s then placed 

 on a slide on its side, so that its \yings could be examined. 



A further crop of new ditHculties now arose. The hiudwing 

 could not be examined because the forewing co\'ered it almost 

 completely, Iving obliquely across it; while the forewing ii\ its 

 turn was partly covered by the large spiral coil of the immensely 

 long antenna, which was pressed down Hat upon it. (see Text-fig. 

 2). Moreover, both antenna and wings were sticky, and could 

 not be persuaded to separate, except by in- ni _^-"^^^ 

 serting the point of a needle between them — \fir\ \ a 

 a proceeding which seemed bound to cause ® L^ XX. 

 some dislocation of the delicate tracheal plan. j/V\ \\ 

 After this separation had been effected, the ^ //^ ^'j ] 

 long antenna was cut off close to the base, N^Y^^y-n '^^ 

 and removed. The two wings were then y ^^Q^- ■..a.c 

 dissected away with fine scissors, and floated z<\ \ 7 



off on to a glass slide. They were then ex- ^<^l \ \y 

 amined under a low power, when it was seen 

 that considerable displacement of the tra- "'"' 



cheation had taken place. Enough of the main plan, however, 

 could be made out to show how remarkably specialised it was, 

 and how important it would be to obtain an absolutely perfect 

 record of it. 



By this time I was reduced to a single source of suitply. viz. 

 Chrysopa Huinafn. Fortunately my own larvie were supplemented 

 by two batches of larv?e received frtjm Mr. Gallard, so that, in 

 all, I still had some two dozen larvie available. These began to 

 spin up about the middle of Noxember, and had all completed 

 their cocoons within a few days of one another. After waiting 

 three days, 1 opened two cocoons, and found that they still I'oii 

 tained larvte. These cocoons were closed up again, the lids being 

 held in place by cotton-wool. The following day, one of the 

 larvje pupated. This pupa was taken when less than one day 



"Pupa of Chrysopa siijnata Walk., after extraction from cocoon; ( x 9). 

 a, antenna: ac, its spiral coil adhering to the forewing; e, eye; Fir, fore- 

 wing; //('•, hinilwing; in, pupal niandihle.s. 



