EXPLANATION OF PLATE LXIII. 



Fig, 1. Larva of Harpalus, feeding on eggs of locust; enlarged. (Emerton del.) 



Fig. 2. Larva of Anthomyia radicum, var. CaJopteni Riley, feeding on eggs of locust. 

 a, larva, enlarged twice ; 6, pupa-case, natural size ; c, the same raagnified twice. The 

 cross-lines represent the length of body and expanse of wing of the fly, which is mag- 

 nified three times. — (After Curtis.) 



Fig. 3. Red-tailed Tachina fly (after Riley), a, a larva of Tachina which preys ou 

 the European cabbage- butterfly, introduced to illustrate the maggot of Tachina. 



Fig. 4. Trombidium sericeum Say, natural size aud magnified. 



Fig. 5. The Red mite, young oi" a species of Trombidium {Aatoma gryllaria Le Baron) ; 

 enlarged. 



Fig. 6. Gordius aquaticus. A, egg ; B, egg undergoing segmentation of the yolk ; C, 

 embryo (gastrula) with the primitive stomach an infold of the outer germinal layer of 

 cells (ectoderm); D, embryo farther advanced ; E, larva, with the three circles of spines 

 retracted within the cBSophagus; F, the same stage greatly enlarged to show the in- 

 ternal organs; c, middle circle of spines, the head being retracted ; m, muscular layer (?); 

 t, beak or proboscis ; i, intestine ; z., z, embryonal cells ; /, excretory tube leading from 

 g, the secretory glands; oa, oesophagus; v, rectum; n, anus. G, the second larva, 

 encysted in a fish — (after Villot). H, Gordius varius, end of body of male, much en- 

 larged. I, Gordius aquaticus, end of body of male, much enlarged. K, Gordius 

 aquaticus, natural size. (H, I, K, drawn from nature by J. S. Kingsley.) 



