ON A NEW. GENUS AND) SPECIES. .OF 
COCCIDAK FROM NORTH-WESTERN. INDIA 
AND. EA STE RNG) PaeeR Sian. 
By E. ERNEST GREEN, F.E.S., F.Z.S. 
(With Plates XXI—XXII.) 
Genus Naiacoccus, nov. 
Characters as in Eviwm (of the subfamily Pseudococcinae) : 
but with an enormously elongated ovisac, within the anterior 
extremity of which the adult insect lies concealed. Type serpen- 
dimus, Green. 
Naiacoccus serpentinus, sp. nov. 
Adult female occupying the extremity ofa long, white, tubular 
ovisac which may form either a simple loop or be twisted into an 
irregular coil (see fig. 1). When uncoiled and extended the ovisac 
may attain a length of approximately one and three-quarter inches, 
the average length being well over one inch. 
Adult female, removed from the ovisac, dull slaty grey or pur- 
plish brown: broadly ovoid when viewed from above (fig. 20) : 
irregularly tumescent when viewed from the side (fig. 2a): the 
dorsai area of the abdomen contracted and transversely wrinkled, 
the posterior segments assuming a dorsal position. Antennae 
small, 7- to 9-jointed (see fig. 3), the proportionate lengths of the 
several joints varying considerably. The normal number is ap- 
parently 8 (fig. 3b, c, d), the larger number (fig. 3a) being excep- 
tional and produced by a fracture of the normal 4th joint, while 
the smaller number has presumably resulted from the fusion of 
two joints (fig. 3f). In some instances the division between the 
7th and 8th is incomplete (see fig. 3e). Apex of terminal joint 
truncate or obtuse, with 5 or 6 stout hairs: each of the remain- 
ing joints usually witli r or 2 small hairs on one side. Limbs 
small but comparatively stout (fig. 4): the tibia and tarsus 
together markedly shorter than the femur and _ trochanter; 
coxa unusually large, especially in some examples (see fig. 40) ; 
digitules simple. Anal ring (fig. 5) with 6 stout setae: some 
smaller setae immediately above and below the anal aperture. 
Anal lobes inconspicuous, represented by two small rounded 
prominences on the dorsum—one on each side of, and slightly below 
the anal aperture (see fig. 2b). Spines of the form shown at 
fig. 5b occur in transverse series across the dorsum of the abdomi- 
nal segments—sparsely on the basal but more numerously on the 
