DOA 
ON ECLOPARASITES OF THE RED GROUSE. | Mar. 16, 
Prate XI. ° 
Fig. 12. Alimentary canal of G. tetraonis dissected out: oe. cesophagus, ec”. crop, 
Fig. 
Fig. 
Fig. 
Fig. 
13. 
14. 
15. 
Ore 
33. 
b4. 
sto. stomach, m.t. Malpighian tubules, mb. intestine, 7.g/d. rectal glands. 
Some of the crop-contents of G. tetraonis, pressed out. It consists of 
feathers in various stages of disintegration. 
Egg of Menopon pallescens Nitzsch. Under pressure the operculum has 
come off and the ovum is squeezing its way out. 
Four eggs of Goniodes tetraonis, attached to the base of an after-plume, 
between it and the shaft of the plume of a feather from the flank. In one 
of them the operculum has fallen off. 
Pratt XLI. 
. Optical section of abdomen of G. tetraonis, showing a. anus, c. crop, fb. 
fat-bodies, int. mtestine, 7.glds. rectal glands, ov. ovary. 
. Nirmus cameratus Nitzsch. Dorsal view of female. 
. Ventral view of the same. 
Prate XLII. 
. Ventral view of head of Nirmus cameratus, showing mouth-parts, antenne, 
eyes, position of anterior legs. 
. Eggs of Nirmus cameratus on the feathers of a young grouse approxi- 
mately three weeks old. A. Very slightly magnified; three eggs on one 
of the wing-coverts. . Magnified about eight times on a downy plume. 
C. Very highly magnified to show the reticulations. 
Prare XLII. 
. Ornithomyia lagopodis Sharp. A. dorsal view, B. ventral view, C. dorso- 
lateral view of toot. 
Pratt XLIV. 
A ventral view of the anterior edge of the head of O. lagopodis and the 
mouth-parts. Ant.antenne, e. eyes, map. maxillary palp, prob. proboscis. 
A still more enlarged view of the orifice of the proboscis is shown to the 
right. 
23. A figure of part of the femur, f.; the tibia, ¢7., the tarsus, ¢a., and the foot 
of O. lagopodis. 
. The same, more highly magnified, from the inner or under surface. emp. 
empodium, ped. pulvillus. 
. Five sketches of the pupa of O.lagopodis. A. Life-size figure of the mature 
pupa; B. the same of an immature pupa dissected out of a fly; C. mature 
pupa-case magnified and seen from the micropyle end; D. a similar view 
of the immature pupa; E. mature pupa-case seen from above; F. the 
same seen from the side. m. micropyle, m.a. micropylar area. 
Prate XLV. 
. The larva of Scatophaga stercoraria L. A. Life-size: B. magnified. a.s. 
pag g 
anterior spiracle, p.s. posterior spiracle, h.s. hypostomal sclerite, m.s. 
mandibular sclerite, ph.s. pharyngeal sclerite, v.¢. visceral trachea, 
¢.c. transverse commissure. 
. Enlarged view of oral and pharyngeal sclerites, lettering as in fig.26. d.g., 
dental sclerite. 
PrarE XLVI. 
. Exlargec view of head of the maggot, showing a.s. anterior spiracles, 
spines, more pronounced at the anterior end of each segment, m. mouth, 
f.b. fat-body ; other lettering as in fig. 26. 
29. Lateral view of mouth of the maggot, showing sensory papillae. Magnified. 
30. Dorsal view of the head of the maggot, showing the anterior spiracles 
protruded. Magnified. 
31. Dorsal view of posterior end of maggot, showing p.s. posterior spiracles, the 
split tracheal main trunks and papillae. Magnified. 
. Lateral view of the same, showing a. the anus. The specimen was slightly 
compressed and the posterior spiracles were a little displaced and both 
brought into view. 
Pirate XLVII. 
Side view of male specimen of Ceratophyllus gallinule Dale. 
Side view of female specimen of the same drawn to scale. 
