232 Lecamtnce. 



LECANIUM HEMISPH/ERICUM, Targ. 

 (Plate LXXXV.) 



Lee. hemisp/ia:?-icum, Targioni-Tozzetti, Studi sidle Cocciniglie, 1S67, p. 27. 



Lec.filicum, Boisduval, 1S67, 336. 



Lee. cqffecE, Walker. 



} Lee. anih'Hi, Boisduval. 



t Lee. hzbernaculorutn, Boisduval. 



Adult female {Jig''. 6, 7), varying in colour from pale brownish fulvous to 

 deep chestnut brown ; all intermediate shades being represented — often on a 

 single plant. The paler forms are often marbled with brown. There is usually 

 a darker submarginal zone, but this is not always apparent. The common 

 form on tea and coffee is bright castaneous, with deep castaneous submarginal 

 zone. Even with a hand lens the derm is seen to be closely specked with 

 minute translucent cells. A few small raised waxy patches, arranged in more 

 or less regular rows, on the median dorsal area. Form oval, hemispherical ; 

 the margin usually outturned and slightly flattened, but often concealed by 

 the bulging sides. In the early adult there is a distinct median longitudinal 

 crest and two transverse ridges {fig. 5) ; but these generally disappear during 

 gestation, though traces of them sometimes remain, especially in starved 

 examples. The dorsal surface is highly chitinous and polished. During 

 gestation the ventral area shrinks upwards, until the scale forms simply a 

 chitinous shell filled with innumerable pale pink eggs {fig. 2). At this time 

 the inner marginal surface is dusted with white mealy powder, and where a 

 scale has been detached from the plast, an oval white ring marks its former 

 position. Antenna {Jig. 15) with eight joints, of which the third is always the 

 longest, and eighth next longest, sixth and seventh always shortest, and equal ; 

 first, second, fourth, and fifth subequal, sometimes one, sometimes another, 

 slightly the longer ; the fourth dilated at distal extremity and without any hairs. 

 Leg {Jig. 16) with tarsus about two-thirds length of tibia. Signoret states that 

 this section of Lccanium is distinguished from all others by a ' true articulation 

 in the tarsus.' If by this he infers that there are two distinct tarsal joints, I 

 have failed to observe them. There is a slight constriction at the middle of 

 the tarsus ; but this is noticeable in many species. Scales of anal operculum 

 {Jig. 14) irregularly triangular ; both inner and outer sides somewhat sinuous ; 

 outer side considerably longer than base. Anal ring with eight stout hairs. 

 Stigmatic spines {Jig. 12) three, median spine long and curved, more than three 

 times length of other two. Marginal hairs numerous, long, distinctly dilated 

 and fringed at apex {Jig. 13). Submarginal tubercles, five to six on each side ; 

 obscured in old examples. Dorsal area {Jig. 12) closely studded with numerous 

 well-defined oval translucent cells, each with a smaller concentric ring in a 

 deep layer of the derm, and a minute central pore on the surface. The cells 



