Dactylopiina. 389 



to distinguish the species of Phenacocais from those of Pseudococcus^ and it is 

 doubtful if the former should rank as more than a subgenus of the latter. 



Ferris makes the presence of a denticle on the claw a distinguishing 

 character of this genus ; but there are species with nine-jointed antennae that 

 lack this character {e.g., glomeratus). 



Synopsis of Ceylon Species. 



A. Spiniferous tracts confined to the last two segments of the 



abdomen; spines few glotneratus. 



B. A complete marginal series of spiniferous tracts ; spines 



numerous. 

 {a) Margin of living insect without waxy tassels ; dorsum 



with spiniferous tubercles msolitus. 



{b) Margin with complete series of waxy tassels ; dorsum 

 unarmed. 

 {a}-) Marginal tassels comparatively short, broad and 



flattened iceryoides. 



{b^) Marginal tassels long, cylindrical. 



{a^) Spines sharply pointed ornatus. 



{JP') Spines truncated. 



(a^) Thirty spiniferous tracts ; claw, without con- 

 spicuous denticle mangiferce. 



{b^) Thirty-four spiniferous tracts ; claw, with pro- 

 nounced denticle spinostis. 



PHENACOCCUS GLOMERATUS, 7wv. 

 (Plate CLX.) 



Adult female (when freed from the enveloping mass of cottony secretion) of 

 an orange pink colour. Broadly oval. Mouth parts rather small : thementum 

 distinctly bi-articulate, the terminal joint longest, narrow and acutely pointed. 

 Antenna normally nine-jointed {figs. 2, 3) ; occasionally the division between 

 eighth and ninth is imperfect ; in one example a ten-jointed antenna {fig. 4) was 

 observed, a small joint being interposed between the normal fourth and fifth ; 

 second usually longest, with the ninth next longest, but the third is often 

 approximately equal to the second ; fifth usually markedly longer and larger 

 than fourth {fig. 2), but occasionally these two joints are of equal size {fig. 3) : 

 eighth always shortest. Legs moderately stout ; tarsus rather less than half 

 length of tibia. Claw stout, without any denticle ; ungual digitules slightly 

 dilated, tarsal digitules simple {fig. 5). Anal ring {fig .6) with six longish stout 

 setae, rather more than half the length of the caudal seta;. A pair of small 

 conical spines on each anal lobe, and a single spine (occasionally two) on the 

 lateral margm of the preceding segment ; other segments unarmed. Derm 

 with numerous small pores and some fine hairs ; some longer and stouter hairs 

 between the antenna;. Average length 3 mm. 



