OBSERVATIONS ON SCALE-INSECTS (COCCIDAE) — III. 363 



other resj)ects, so far at least as I am able to judge by the scanty material at hand, 

 the two insects are practically identical. But the derm cells in oleae are so strikingly 

 different that I have no hesitation in erecting a new name for Mr. Anderson's speci- 

 mens. Lecanium {Saissetia) sylvestrii, Leonardi,* bears some resemblance to persimile, 

 but is clearly distinct. 



Lecanium (Saissetia) subhemisphaericum, sp. nov. 



Female, adult. Not differing from Lecanium hemisphaericum, Targ., in its general 

 form and colour. Dermal pores mores or less circular, exceedingly few in number,"}* 

 irregularly scattered and extending almost to the margin ; the latter with short, 

 closely set pigment bands. Stigmatic clefts minute ; spines three, the laterals short 

 and stout ; middle one also very stout and rather suddenly pointed. Marginal spines 

 all broken away. Anal cleft united. Anal lobes more or less triangular, inner edge 

 slightly the longest. Antennae (fig. 14) of seven segments, the 3rd, 4th and 7th 

 much the longest ; the last three each Avith a long spine, that on the terminal segment 

 being markedly the stoutest ; formula : 3, 7, 4, 2, 1 (5, 6), or (3, 7) 4, 2, 1, (5, 6). 

 Legs slender but well developed ; lower digitules stout. 



Length, l*9-2"9 mm. 



Uganda : Naguriga, Chagwe, on coiiee, 27.ii.13 (C C. Gowdey). Gold Coast : 

 Aburi, on coffee, 27.xii.15 C^. H. Patterson). 



Fig. 14. Lecanium. subhemisphaericum, Newst., sp. n. ; 

 antenna of $. 



The affinities of this species are somewhat doubtful, but judging by the dermal 

 characters alone, it fits best in the sub-genus Coccus in Fernald's classification. 

 But as it bears such a close resemblance to Lecanium (Saissetia) hemispJmericum, 

 I feel that it is best placed in this section for the time being. Easily determined 

 by the somewhat unusual form of the antennae and the sparsity of the derm glands. 



Lecanium (Saissetia) signatum, sp. nov. 



Female, adult. Broadly ovate, sometimes attenuated in front ; flat and finely 

 rugose, but slightly glossy. Dorsum generally with a well marked 1-shaped ridge, 

 the transverse bar of which is longer than the stem. Colour varying from pale 

 castaneous to dark piceous ; the pale forms sometimes with a relatively broad dark 

 marginal zone, the dark forms often with a paler margin. Antemiae (fig. 15, a) 

 of seven segments, of which the 4th is the longest ; but this segment often has a 

 partial, or in some instances even a complete, subdivision just below the distal 

 constriction ; 7th segment somewhat variable in length, but usually much longer 

 than the preceeding one. Legs with the tibio-tarsal articulation (fig. 15, g) more or 



*Bull. Lab. Zool. Gen. Agr. Porticj, \, p. 276, fig. xxii (1911). 



t In the field of a Leitz 7th objective (Xo. 4. eyeiiiece) the following counts were made 

 in eight different parts of the derm : 3, 0, 0, 0, 1, 0, 4, 6. 



