46 On a new Scale-Insect of the Genus Walkeriana. 



eighth longest, as long as second and third together ; com- 

 mencing with the longest, the antennal formula will be : — 

 8, 3, 2, 1, (4, 5, 6), 7 ; each joint with a ring of stout hairs 

 near the distal edge, except the eighth, which has similar 

 hairs scattered irregularly over its surface and two very much 

 longer ones on one side (fig. 3). Eye (fig. 7) prominent, 

 conical. Legs stout, with scattered hairs and spines; a very 

 long hair on trochanter. Foot (fig. 6) with stout curved 

 claw ; digitules four, simple tapering bristles. Tibia a little 

 shorter than femur ; tarsus less than half length of tibia. 

 Rostral apparatus situated between first and second pairs of 

 legs. Skin on under surface with numerous stout hairs, 

 which are longest and whip-like on the space between an- 

 tennas and rostrum. Each hair has a small transparent 

 collar round its base and is mounted on a prominent tubercle 

 (fig. 4, b). Skin on dorsal surface thickly studded with 

 tubular spines, stout hairs, and glandular pores of several 

 forms (figs. 4, 5). The tubular spines are especially massed 

 on definite tracts corresponding with the dorsal and marginal 

 processes (fig. 2). The basal third or fourth of each spine is 

 rather abruptly widened ; the distal part slightly curved and 

 tapering to a blunt point (fig. 4, a). Each spiniferous tract 

 has a well-defined border, marked by a line of small pores 

 with prominent thickened rims and cross-shaped orifices 

 (fig. 5, a) ; and the marginal tracts enclose central spaces 

 bearing a few whip-like collared hairs (fig. 4, b) and 

 specialized glandular pores with very prominent rims, each 

 with a broad duct leading down into the body for a short 

 distance, their orifices oblong and transversely constricted 

 (fig. 4, c) . Scattered over the dorsal surface are other glan- 

 dular pores having prominent rounded rims, with depressed 

 centre and circular orifice (fig. 5, b). Anal aperture sur- 

 rounded by a dense cluster of stout tapering hairs converging 

 to the centre. 



The largest of the specimens under examination measures, 

 exclusive of waxy appendages, 8x5 millim. 



Cast skins of the younger stages show a double median 

 dorsal series of incurved waxy processes. The marginal 

 processes are longer and more tapering than in the adult. 



It is possible that the specimens under examination are 

 immature. There is no sign of an ovisac, nor were any 

 embryos observed in the bodies of the insects. The small 

 number of antennal joints also is unusual for an adult 

 Monophlebid. 



Habitat on bark of unidentified tree, Congo, Africa. Col- 



