1914] 
Life History and Anatomy of Siphona Plusie 307 
EXPLANATION OF PLATES. 
Abbreviations used: 
Big, 
Fig. 2. 
Bigs: 
Fig. 4. 
Fig. 5. 
Fig. 6. 
Bigs 1. 
Fig. 2. 
PRTIGEMM GE Ct. Snakes Siem a wea Metenteromes ss... .s:.. ssn Ye 
JENVALB TS tt Abe Eten gad ant es A a A IMISG eyAe cee 5. oo Se L 
Rattler ons wanna eto BodysGangliany. 2. .ce N 
Hate Cell ses eo eres F @esophdcuste 4.25. O 
(Greate Hooks: nn. .5 50 IRroventiiculticnes. 5-502 
Peart erp ns oso H Salivary Glands.........G 
imeasinalmDiscsase 4) yt 5.1 DDIDACLES roca nce aot oie 
Malpighian Tubules......M bra chaerne see othe acer 1p 
IMesenterome. se.n\a.aic) srs x 
PLATE XXXIX. 
Cross sections through larvae. 
Section through anterior portion, about the second segment; T, trachea; 
I, imaginal discs; G, salivary glands; O, oesophagus; L, muscles. 
Section through neuroblast, about the third segment; H, heart; T, trachae 
O, oesophagus; B, brain; N, sub-oesophageal ganglion; G, salivary 
glands. 
Section through proventriculus, about the fourth segment; H, heart; 
F, row of fat cells; T, trachea; P, proventriculus; N, ganglion, G, 
salivary glands. 
Section through many folds of the alimentary canal, about the fifth 
segment; H, heart; T, trachea; M, Malpighian tubules; C, alimentary 
canal; L, muscles. 
Section showing Malpighian tubules branching from alimentary canal, 
about the eighth segment; H, heart; T, trachea; M, Malpighian tubules; 
C, folds of alimentary canal. 
Section near posterior end; T, trachea; M, Malpighian tube; C, alimentary 
canal; A, anus. 
PLATE XL. 
Horizontal longitudinal view of larva, showing, O, oesophagus; P, pro- 
ventriculus; X, folds of the mesenteron; Y, the metenteron; M,anterior 
and posterior Malpighian tubules. 
Vertical longitudinal view of larva, showing, S, spiracle; G, salivary 
glands; B, brain; N, ganglion; F, row of fat cells; T, trachea; H, heart: 
L, muscles. 
