156 Transactions of the Royal Society of South Africa. 
in the genus Sphaerococcus. These latter may be compared with the 
Pseudococcine genus Antonina. 
Gen. coccus Goeze (?). 
" ^ : Without ciHated anal ring or anal lobes. Antenna normally with 
7 joints, the number occasionally reduced by the confluence of two or 
more segments. Derm with irregular clusters of glandular pores and 
truncate spines. Eyes prominent, simple. Legs well developed. The 
truncate spines are cylindrical and apparently tubular. They are very 
numerous on the wild forms, but are generally reduced — both in number 
and size— on the cultivated species." {Green, 1912.) 
41. Coccus CACTI Goeze 1778 (and others). 
(Plate XXII., Fig. 43.) 
Coccus cacti Goeze, Ent. Beitr., ii., p. 341, 1778. 
Dactylopius coccus Costa, Faun. Eegn. Nap., Cocc, p. 16, 1835. 
Pseudococcus cacti Westw., Mod. Class. Ins., ii., p. 445, 1840. 
Coccus cacti Sign., Ann. Soc. Ent. Fr., (5), v., p. 347, 1875. 
,, Comst., Eep. U.S. Dep. Ag., 1880, p. 346, 1881. 
Dactylopius coccus Fernald, Catalogue, p. 80, 1903. 
Coccus cacti Green, Journ. Econ. Biol., p. 82, 1912. 
" Adult female subglobular, slightly narrower behind. Purplish-red, 
pruinose, but without conspicuous white tomentum. 
Eyes prominent, cylindrical, rugosely chitinous. 
Antennae short, basal joints very broad, others narrowing successively, 
7-jointed, 1st joint very irregular in form, 2nd joint represented by a broad 
chitinous ring, 3rd and 4th usually more or less confluent, the junction 
incompletely demarked by bands of translucent intersegmental tissue, 5th 
broad and short, 6th approximately equal in breadth and length, 7th 
elongate, twice as long as broad, with some stout curved hairs on the 
apical half, a few stout spiniform hairs on the apical margins of the other 
joints with the exception of the 3rd, rarely 6-jointed by suppression of the 
5th or 6th joint. Length of antenna 0-2 to 0*3 mm. Breadth of basal 
joint 0"16 mm. 
Legs stout, terminating in a slender, longish curved claw, femur and 
trochanter together 0*38 mm., tibia 0'16 mm., tarsus (without claw) 0*15 
to 0*16 mm. 
The most conspicuous feature of the derm is the presence of numerous 
