DEVELOPMENT OF TRLOHOGRAMMA EVANESOENS. 185 
PD. Proctodseum. POST. Posterior pole. P. B. C. Frontal process 
of larva. B. Reed. S. L. N. Mostly vitellopliags of host. ST. 
Stomodseum. TH. Glandular thickening secreting frontal process. 
V. Yentral. V. C. Yacuoles in cells. V. M. Yitelline membrane. 
Y. Yolk. 
[In reproduction all figures reduced by one-half.] 
Figs. 7, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 23, 24, 25, 28, 29, 
30, 32, 33, 34, 35, 37, drawn with a Zeiss oil immersion and compen. 
eye-piece 8. A camera lucida was used, with drawing-board slightly 
inclined towards the microscope, and at table level. Magnification 
about 1,760 diameters. 
Figs. 27, 31, and 38 from Zeiss ^ an( ^ com P- eye-piece 4. 
Figs 10a, 11a, 13a, 16, 21, 22, 26 enlarged about twice from camera 
drawings with O. ^ E. 8. 
Figs. 36, 40, 41, 42, and 43 enlarged in the same way about four times. 
Fig. 8 drawn with O. £ E. 2, drawing-board at table level. (Camera 
lucida). 
Fig. 39 was drawn with Zeiss O. F. E. 4. 
Fig. 4. — x 2400 (Koristka T \tli X Hug. oc. 5. 
PLATE 10, 
Fig. 1. — Tricliogramma evanescens (Westwood), adult female 
(now x 75.) 
Fig. 2. — Donacia embryo X 75 containing at its posterior pole a 
parasite ( D.P. ). Whole preparation. The parasite was at the stage 
drawn in PI. 11, fig. 24. 
Fig. 3. — Donacia simplex ( F .) X 4. 
Fig. 3a. — Egg mass of Donacia, viewed from side with parasite (P.). 
All to same scale as beetle. 
Fig. 4. — Transverse section in mid region of an embryo when the gut 
lumen has formed, Shows the flattening out of the extruded mass 
(EX. N.) under the chorion ( CH .). 
Fig. 5. — Stages in amitosis of somatic cells. 
Fig. 6. — Part of early blastoderm stage to show chorion (CH.) and 
extruded nucleolus (EX. N.). 
PLATE 11. 
Fig. 7. — Part of Donacia egg showing the newly-laid egg of the 
^parasite in transverse section. 
