GREEN—COCCID.E, 205 
which are crowded in the actual stigmatic cleft and extend—in a single row—for some 
distance on each side of it (fig. 7). Anal operculum elevated, surrounded by a strongly 
chitinous area of a deeper colour. Valves of operculum with broadly rounded outer 
margin. Length of test 3:0 to 3:50 mm. Length of denuded insect 2:0 to 2°50 mm. 
On “ Bois la fumée,” Aldabra. Coll. R. Dupont. 
Lecanium tessellatum, Sign. (Plate 21. figs. 9-13.) 
Ann. Soc. Ent. Fr. (5) iii, p. 401 (1873). 
As stated in my introductory note, the long series of this species provides material 
showing a complete chain connecting typical ¢essellatum with perforatum, Newst., and 
subtessellatum, mihi. Though Signoret’s name must, by priority, be accepted as the 
type, the form perforatum is probably the normal one, being by far the more abundant. 
As can be seen by the accompanying figures (9 to 12), the minor details of the 
tessellation show considerable variation. In fact, the only constant part of the pattern 
is the marginal series of cells, which, when present (fig. 12 is undoubtedly an 
abnormality), show a constant number of 46, viz.:—3 on each side, anterior to the eye- 
spot ; 3 between eye-spot and anterior stigmatic cleft; 4 between the two stigmatic 
clefts ; and 13 between posterior stigmatic and anal cleft. As regards the tessellation, the 
forms ¢essellatum and subtessellatum are distinguished by the greater or less obscuration 
(through thickening of the chitin) of the median divisions. The variation in the number 
of antennal joints (normally 8) is due to suppression of the 8rd, or 3rd and 4th joints, 
resulting—in the 6-jointed form—in a greatly elongated 8rd joint (vide fig. 18, in which 
the dotted lines indicate the position of suppressed joints). These variations, both in 
tessellation and antennal joints, are not dependent upon different food-plants, but may 
be found in individuals of the same brood. In some examples, one antenna may have 
6 or 7 joints, while the other has the full complement of 8. 
Mytilaspis auriculata, sp. nov. (Plate 21. figs. 14-16.) 
Puparium of female entirely white, semidiaphanous (older examples sometimes tinged 
with pale fulvous); exuvise colourless or very pale stramineous; elongate, narrow, 
subparallel, moderately convex, straight or (in crowded assemblages) more or less 
distorted. Length 2 to 2:50 mm.; greatest breadth averaging 0°75 mm. 
Male puparium not observed. The insects are densely massed upon the twigs of the 
plant, but the assemblage consists solely of female individuals. 
Adult female (fig. 14) narrowest in front, broadening rapidly to the abdominal area. 
Lateral margins of abdominal segments scarcely expanded. An ear-like lateral lobe on 
each side at base of cephalic area. Rudimentary antennie at some distance fron 
margin, close to base of clypeus. Anterior spiracles on a level with the mentum. 
Posterior spiracles beyond the middle of the body. Lateral margins of hinder thoracic 
and abdominal segments sparsely dotted with glandular pores. Two or three stout 
spiniform squames on lateral margins of each abdominal segment. Pygidium (fig. 14) 
broad; margin with a few small but stout spiniform squames. Pygidial lobes small 
