54 

 EXPLANATION OF PLATES. 



(N.B. The figures are of Chirononnis pnsio, Meigen, except where otherwise stated). 



PLATE I. 



Fig. i. Egg-mass on leaf natural size and magnified. 

 Fig. 2. Egg just before hatching. 

 Fig. 3. Larva just hatched, a brain, b fatty tissue. 



Fig. 4. Full grown larva, a prothoracic appendage, b anterior tracheae, c salivary 

 gland, d chitinous hair, e bifurcating hair, / oesophagus, g cardiac chamber, 

 h stomach, longitudinal section of stomach, / peritrophic membrane, 

 k malpighian tubule, / small intestine, m colon, ;/ anus, o posterior tracheae, 

 p anal foot, q tracheal gill. 



Fig. 5. Nervous system and fat-sacs as they appear in a medium sized larva, a fat- 

 sac, b strand of tissue connecting to the anterior end of segment 5, c point 

 of origin of strand, d brain, e suboesophageal ganglion beneath it, / con- 

 nectives, g nerve, h abdominal ganglion. 



PLATE II. 



Fig. 6. Dorsal view of head and first segment of full-grown larva, a lip, b short 

 toothed feeler, c long toothed feeler, d tentacles, e broad-based prominence, 

 / chitinous spines, g anterior sclerite, h triple chitinous hair, i last three 

 segments of antenna, j sensory bulb, k double transparent hair, / man- 

 dibular tentacle, m mandible, arborescent hair, o boss, p posterior selerite, 

 q eyes, r epicranium, s clypeus, / tracheae, u tracheal capillaries ramify- 

 ing on the dorsal surface of the first segment, v chitinous hair, w chitinous 

 ring, x dorsal surface of the labrum, y lateral inlet, 



PLATE III. 



Fig. 7. -Ventral view of the head of fully-grown larva, a bulb, b anterior comb, 

 c papillae, d posterior comb, e epipharynx, / ventral portion of the anterior 

 sclerite, g grappling hooks, h v-shaped rod, i generalized appendage, 

 / maxilla, k chelate claw of maxilla, / submentum, m striated flap, n men turn, 

 o epicranial plate, p salivary duct, q trachea, r recurrent trachea to the 

 brain. 







Fig. 8. Dorsal view of the last segments of C. pusio. 



Fig. 9. Dorsal view of hind segments of larva No. n showing the I3th segment, 

 and the arrangement of some of the muscles. 



