( 530) 
XVII. A new Southern Nigerian Lecanium (Coccidae). 
By Prof. R. Newsreap, F.R.S. 
Puate XIX, Fig. 2. 
Lecanium (Saissetia) farquharsoni, sp. n. 
Female adult. Form hemispherical, or narrowly ovate and 
highly convex; margin very thick, forming a distinct rounded mould- 
ing or bead. Integument with a faintly matted surface when . 
preserved in alcohol, due apparently to secretion or foreign matter, 
on the removal of which, by slight friction, the derm presents a 
polished appearance. Colour rich dark castaneous; immature 
examples dusky buff. Antennae of eight segments; the 3rd equal 
to or a little longer than the 2nd. Legs robust; anterior pair with 
an unusually long bristle on the trochanter; tarsus inclusive of the 
claw about equal in length to the tibia. Anal lobes (fig. 2a) forming 
together a distinctly pyriform outline, the distal margin being about 
half the length of the lateral and markedly rounded; distance from 
distal margin of the lobe to the anal margin of body one-fourth the 
entizve length of the body. Anal cleft fused. Stigmatic clefts 
obsolete; spines three or four in number. Marginal spines (fig. 2b) 
of varying lengths and irregularly disposed, some of them more 
than twice the length of the longest stigmatic spines; some of 
them are quite simple; others are slightly frayed distally. Derm 
cells irregularly ovate closely packed together. Collectively they 
produce a reticulated pattern at the margins. 
Length, 44:25 mm.; width, 3°50 mm. 
Young adult 2. Form more or less circular or broadly ovate with 
the front slightly narrowed or produced; dorsum low convex or 
more or less flat. Colour dusky buff or pale ochreous. Antennae 
(fig. 2c) of eight segments, the 3rd slightly the longest. Stigmatic 
clefts faintly indicated, spines (fig. 2e) similar to those in the old 
adult. Derm cells at the margin as in the mature examples, but 
much less pronounced in the central area. Anal cleft not com- 
pletely fused, and placed in the same position relatively to the 
margin of the body, as in the old adult. 
In the nymphs or second stage 2 the anal cleft is not fused. 
W. Arrica: §. Nigeria, Moor Plantation, Dec. 1917. : 
C. O. Farquharson. 
[The Coccidae were found on a plant of Imbricaria 
maxima (Sapotaceae) and formed the food of a carnivor- 
TRANS. ENT. SOC. LOND. 1921.—PaRTS II, Iv. (JAN. ’22) 
