1909. | ECTOPARASITES OF THE RED GROUSE. Boo 
° EXPLANATION OF THE PLATES. 
List oF ABBREVIATIONS. 
a., anus. i | mi., micropyle. 
ant., antenna. | m.s., mandibular sclerite. 
a.p., chitinous rod supporting upper | m.t., Malpighian tubules. 
movable lip. | Imax. & 1mx., 1st mavyilla. 
a.s., anterior spiracle. | 2max. & 2mx., 2nd maxilla. 
C., COXA. | mx.p., maxillary palp. 
cer. In fig. 12, & c. in fig. 16, crop. ce., cesophagus. 
dg. in fig. 27 & ds. in fig. 28, dental | Ov., Ovary. 
sclerite. | p. & ped., pulvillus. 
dg. & d.gl., ducts of oval glands. | prob., proboscis. 
e@., eye. p-S., posterior spiracle. 
emp., empodium. | ph.s., pharyngeal sclerite. 
f., femur. | yx.eld., rectal glands. 
f.b., fat-bodies. Sp., spines. 
gl. & glds., oval gland. | St. im fig. 9, crop; in fies. 29 & 80, 
h.l., “moustache” lip. | st., sensory papilla. 
h.s., hypostomal sclerite. | sti., stigma or spiracle. 
int., intestine. sto., stomach. 
Ist lg., Ist leg. t.c., transverse commissiire. 
lu., upper lip. | ta., tarsus. 
lyr., lyriform organ. ti., tibia. 
m., mouth. | tr., trochanter. 
m.a., micropylar area. | iu.l., upper lip. 
mb., rectum. | v.t., visceral trachea. 
md., mandible. 
PratE XXXV. 
Fig. 1. Goniodes tetraonis Denny, male seen from above. The legs are shown on 
the left side only. The forked character of the antennz, the upper lip. 
and the lyriform organ are well shown in the head and the male genital 
plates in the abdomen. 
2. Goniodes tetraonis Denny, female seen from above. Note the different 
shape of the head and of the outline of the body. The legs are not shown. 
3. The same seen from below, showing the upper lip, the mandibles, the 
Fig. 4. 
5. 
Fig. 6. 
lyriform organ, and the legs. 
Prate XXXVI. 
Ventral view of head of male G. tetraonis, showing the forked antennz, 
the mandibles, the pores in the chitin under the hairs, the muscles 
running to the upper lip, the eyes, the lyriform organ, and the ducts of 
the oval gland. 
View of mouth-parts showing the “upper lip” w./., the moustache lip h.1., 
the mandibles id., the first maxille 1 maa, the second maxille 2 maw., the 
ducts of paired glands d.g/. and the lyriform organ lyr., and the chitinous 
bar supporting the upper lip a.p.; glds., the oval gland. 
Pratt XXXVIT. 
View of the ventral surface of right mandible showing the complex nature 
of its articulation. 
7. View of the 1st and 2nd maxillx and of the mouth, the mandibles having 
Fig. 8. 
) 
Fig. 10 
11 
been removed. The glands with their paired ducts uniting in the middle. 
line to open by a median duct into the pharynx, in the centre of the. 
lyriform sclerite. mm. mouth. 
Pratt XXXVIII. 
View of the glands and the lyriform organ, showing the opening of the 
duct. 
Ventral view of the complex, male, external reproductive apparatus, formed 
by various sclerites in the wall of the invaginated genital pouch. The 
posterior angle of the crop st. is shown. 
PLATE XX XIX. 
. A ventral view of the right mesothoracic leg, showing the joints, claws, 
and p. the pulvillus, ec. coxa, f. femur, ta. tarsus, fi. tibia, tv. trochanter. 
. View of the tracheal system of a female, showing the stigmata, sfi. 
