HTALOPTERUS. 109 



imago cuts a curious spiral slit or flap in the cocoon, 

 through which the fly escapes.* 



Reaumur figures one of his Aphis-lions as furnished 

 with fasciculi of hair, and Frisch also thus represents 

 Glvnjso])a. ]jerla. I conclude that my insect is of that 

 species likewise. 



The larva of Hemerohius is not unlike that of 

 Chrysopa, and its voracity equally remarkable. A 

 specimen was sent to me through the post, having 

 been imprisoned without food for two days. This 

 larva was gummed on a slip of glass and placed on the 

 microscopic stage for drawing. Thus the limbs were 

 incapable of motion for half an hour or more, yet sub- 

 sequently, and in this constrained position it devoured 

 three Aphides, one after another, as they were presented 

 to its terrible jaws. 



Dr. Bowerbank has written an interesting paper 

 on the circulation of the blood in the wings of 

 Chrysopa perl a. i The neuration of the wings in his 

 plate well accords with the veining of my figure. 



Genus XI.— HYALOPTERUS,! Koch, 



Vertex flat, frontal tubercles none. 



Antennae rather long, seven-jointed. 



Cornicles very small, cylindrical, scarcely longer 

 than thick. 



Wings long and hyaline ; veins slender. 



Cauda small, pointed, and recurved. 



'Legs as in Aphis. 



Body oval and rather attenuated, often, both in the 

 larval and winged states, dusted with a white mealy 



* Vide M. Andouin, as quoted in ' West. Introd.,' vol. ii, p. 48. 

 t ' Ent. Mag.,' vol. iv, p. 178. 

 ;|; From vaXivoQ, glassy ; Trrepov, a wing. 



N.B. Occasional indications of frontal tvibercles may be found; tbis 

 character, therefore, must not be regarded as decisive. 



