4,64 ON AJSr ABEEEANT FOEM OF COCCIDiE. 



EXPLANATION OF PLATE 34. 



Fig. 1. The specimen of Helianthemum kahiricum bearing Cercococcus eremohius. Nearly two-ttirds 



natural size. 

 Fig. 2. Ventral view of adult female. a, outer, b, inner longitudinal furrow of the right side; 



c, antenna; d, anterior spiracle. 



Fig. 3. Antenna in side view, showing the spine and two of the hairs. 



Fig. 4. Dorsal view of adult female, a, a, tubercles of the median and lateral longitudinal rows. The 



dots rejjresent the numerous pits of the thread-producing glands. 

 Fig. 5. Ovisac on a twig, a, hole in which the tail of the insect lay. 

 Fig. 6. Portion of the wall of the ovisac, highly magnified, a, anastomosing branches ; b, opaque 



materia). 

 Fig. 7. Part of one of the threads secreted from the dorsal surface, showing the longitudinally striated 



appearance. To same scale as fig. G. 

 Fig. 8. Male puparium on a twig, a, slit at posterior end. 

 Fig. 9. Ventral view of extremity of tail of adult female, showing the anal ring and orifice, a, minute 



papillae on the integument ; b, median lobe, dorsal to the anus ; c, one of the anal lobes-; 



d, genital aperture ; e, transverse band of circular pore-plates on the sixth segment. 



Fig. 10. Portion of the dorsal integument of a specimen treated with caustic potash, highly magnified. 

 In the upper part are some of the numerous pairs of pore-plates, a, outline of floor of one 

 of the pits ; b, space left between the two concavities in the margins of the rims ; c, com- 

 mencement of the tail-region, where the pore-plate pairs are almost completely absent. In 

 the lower part of the figure are some of the pits with sieve-like walls ; d, pit in side view ; 



e, one in surface view ; /, narrow ducts of glands of the second kind. 



Fig. II. Two of the dorsal pits in side view, each with a pair of pore-plates at the bottom ; a, papilliB 

 between the pore-plates. In the middle, a duct of a gland of the second kind; b, thin-walled 

 portion of straight tube ; c, its thicker-walled portion ; d, bend iu the duct ; e, terminal 

 swelling. 



Fi"'. 12. One of the dorsal pits and pairs of pore-plates, fi-om a transverse section torn in such a way 

 as to show the pair of papillae between the pore-plates. 



Fig. 13. A single circular pore-plate from one of the transverse ventral bands. To same scale as fig. 10. 



Fig. 14. Part of the dorsal surface of a dried specimen, showing some of the pits, each with two threads 

 emerging from it ; the greater part of the threads cut away. 



Fig. 15. One of the glands of the second kind, a, aperture of duct on outer surface of body; b, inner 

 secretory portion of gland-cell showing radial striae ; c, accessory cells. 



Fig. 16. Part of oue of the same glands, more highly magnified, a, nucleus of glandular cell. 



Fig. 17. Transverse section through one of the pairs of thread-producing cells. The section only passes 

 through the nucleus of one gland. «, one of the cells ; b, papilla between the two pore- 

 plates ; c, cuticle of the general body-surface; d, hypodermis ; e, subhypodermal layer, and 

 /, the sheath which it forms round the glands. 



