58 Trans. Acad. Sci. of St. Louis. 



EXPLANATION OF ILLUSTRATIONS. 



Plate I. — A green female, showing the insect in act of moving head 

 about. (Photograph from life.) 



Plate II. — A male and female in copulo; showing the sexual diporph- 

 ism of the species. (Photograph from life. Natural size.) 



Plate III. — The male being devoured by the female while mating. 

 (Natural size.) 



Plate IV. — A group of adults. (Photograph from life.) 



Plates V, VI, VIII. — ^Females and their natural environments. (Pho- 

 tograph from life. Natural size.) 



Plate VII. — A dark gray and a green female in the attitude of fight. 

 (Photograph from life.) 



Plate IX. — A gray female and her egg-case. (Photograph from life.) 



Plate X. — An abnormally small egg-case and its maker. (Photograph 

 from life. Natural size.) 



Plates XI, XII, XIII. — Nymphs in the fifth instar, showing the ad- 

 vantage of resemblance to environment. (Photograph from life. 

 Slightly enlarged.) 



Plate XIV. — A female W'ith the integument removed, showing the 

 ribbon-like substance, the material for egg-case making as it appears 

 after hardening in chloral hydrate. — Fig. 1. Dorsal view. — Fig. 2. 

 Ventral view. (Much enlarged.) 



Plate XV. — Egg cases, (Slightly reduced.) 



Plate XVI. — The structure of the egg-case. — Fig. 1. Horizontal section 

 near botton (Floor). — Fig. 2. Horizontal section near top (Ceiling). — 

 Figs. 3 and 4. Horizontal sections through the center. — Figs. 5 and 6. 

 Longitudinal sections. — Figs. 7 and 8. Cross sections. (All enlarged.) 



Plate XVII. — Nymphs just after emerging. (Greatly enlarged.) 



Plate XVIII. — Fig. 1. Head, prothorax and forelegs of an adult fe- 

 male. — Fig. 2. A nymph going through its first moult. (Enlarged and 

 % natural eize.) 



Issued March 25, 1913. 



