insects infesting the bread-fruit tree of Ceylon. 651 



long and setose. The front of the head is rather 

 irregular and slightly setose. The antennae are beautiful 

 objects for the microscope, arising from two or three 

 thickened, very short, joints (fig. 2), and followed by 

 long slender joints, each of which is composed of a vast 

 number of minute anuuli, very finely setose, the extremity 

 of the terminal joint being shown in fig. 3. 



The nymph or pupa (fig. 5) is comparatively narrow, 

 and exhibits the rudimental wings of a small size at the 

 sides of the "alitrunk," as Mr. Kirby styled the two 

 wing-bearing segments conjointly ; the body is termi- 

 nated by a small conical point. The rostrum or proboscis 

 (fig. 6) extends along the breast to nearly the base of 

 the middle pair of legs (which are long and slender). In 

 the accompanying drawing it is extended laterally beyond 

 the sides of the prothorax. 



The full-grown apterous viviparous female (fig. 7) has 

 the body much swollen and rounded, without any traces 

 of wings or wing-covers ; the antennae are very long and 

 slender. The front of the head is represented in fig. 8, 

 and the antenna; greatly magnified in fig. 9. 



With regard to the destruction of the green aphides 

 on various plants, Mr. Staniforth Green states to me, in 

 a recent letter, that although the use of Paris-green, so 

 strongly suggested by the American economic entomo- 

 logists, has been hitherto tried in a feeble way, and 

 without producing much diminution of these pests, it 

 being considered that it would be too costly to be applied 

 on a large scale. 



Explanation of Plate XXI. 



Fig. 1. The winged viviparous female. 



2. Side of head and base of antenna of ditto. 



3. Extreme tip of the antenna. 



4. Hind vi'ing of ditto. 



5. The pupa. 



6. The proboscis of ditto. 



7. The apterous viviparous full-grown female. 



8. Front of head of ditto. 



9. yide of head and right antenna. 

 All the figures are highly magnified. 



