EXPLANATION OF PLATE XXIIL 



Fig. L — Side view of yniinn- larva showing the nervous system as seen 

 in a Canada balsam preparation. 



Fig. 2. — Head and thoracic region of a full grown larva showing the 

 nymphal trumpets, the imaginal wings, the halteres 

 and the three pairs of legs. 



Fig. 3. — Side view of the head. 



Fig. 4. — Ventral view of the head. 



Fig. 5. — Left mandible seen from below. 



Ym. 6. — Right first maxilla seen from the ventral surface. 



Figs. 7, 7a. — Types of hooks found on thoracic feet. 



Figs. 8, 8a, 86, 8c. — Types of hooks found on the abdominal feet. 



Fig. 9. — Alimentary System of the larva. 



REFERENCES TO LETTERING. 



A (1) — A {0). Abdominal segments. A. f. Abdominal feet. An. Antennae. B. G. 

 Blood gills. Br. Supra-ccsophagcal nerve ganglion (brain). Ca. Cardiac portion of the 

 stomach. Ch. Chamber at the beginning of the small intestine. Col. Colon. E. Eye. 

 F. Flaps on the sides of the labium. H. Haltere. La. Labrum. Lb. Labium, k/. (i), 

 hj. (ii), Ig. (iii). Thoracic legs. Ifrf. Mandibles. m.K. («). First maxilla. iV.T. Nymphall 

 respiratory trumpets, oes. Oesophagus. (S'. vSctai. S.G. Salivary gland. iS. i. Small 

 intestine. <S7. Stomach. T (1) — T (3) i— iii thoracic segments. 2\ f. Thoracic feet. 

 U. T. Urinary or malpighian tubules. IF. Wings. 



