EXPLANATION OF PLATE XIIL 



All the figures are of Ergasilus bengalensis. 

 Fig. 1. — Dorsal view of the entire female animal. 

 2. — First antenna, 

 3. — Second antenna. 

 4.— Mouth parts, x 1250. 

 5. — First swimming leg. 

 6. — Second swimming leg. 

 7. — Third swimming leg. 

 8. — Fourth swimming leg. 



Explanation of lettering. 



a. i. — a. iii. First to third abdominal, segments. A. 1. anal lamina, an. i. an. ii. 

 First and second antennae. E. S. Egg sacs. G. s. Genital segment. La. Labrum. 

 Lb. Labium. Md. Mandible. M. p. Mandibular palp. Mx. i., mx. ii. First and 

 second maxillae. T. 2 — T. 5. Second to fifth free thoracic segments. 



