PLATE CYII. 



ScHizoNEUEA FULiGiNOSA. (Page 96.) 



Fig. 1. — Pupa covered by its tomentose coat. It is 

 ratlier greyer in nature than is here represented by the 

 figure. 



Fig. 2. — Winged female of the same. 



Fig. 3. — Apterous male, drawn under the same mag- 

 nifying power as the former insects. Captured early 

 in November. 



Fig. 4. — Female taken in company with the last, 

 perhaps the perfect-sexed female, l^ot quite so small 

 as the male. 



Fig. 5. — Head and antenna of the imago. 



Fisr. 6. — Part of a leaf of Pinus austriaca, with 

 young Aphides feeding thereon. Usually they range 

 themselves in a long file, with their heads placed in 

 one direction, a. An ovum of one of the Syrphidce 

 secured to the pinna by several silken mooring threads. 

 h represents the outer covering of this egg^ much mag- 

 nified, in which the pores of the membrane are seen to 

 be continued and expanded into corrugated trumpet- 

 like mouths. The whole shell is covered by these 

 stomata, and they form an interesting object for the 

 microscope. The aeration of the ovum, doubtless, is 

 effected through these openings. I have not been able 

 to prove whether they close hygrometrically or not. 

 The egg becomes beautifully transparent by soaking in 

 weak glycerine, and it then shows a footless grub 

 within. 



Scceva pyrastris is said to live ten or twelve days in 

 the larval condition, and about fourteen as a quiescent 

 pupa. The existence of the imago may be prolonged 

 to six weeks. These ova are not uncommon in the 

 vicinity of such Aphides, which constitute the food of 

 the voracious maggots that hatch out of them. 



