204 



[Septpinber, 



Antenna (fig. 2, a) 8-jointed, 3i'd joint longest, 8tli next longest, the 

 remainder much shorter; or 7-jointed (tig. 2, a') by confluence of the normal 

 3rd and 4th joints. Thei'e is a pair of unusuall_y long whip-like hairs on each 

 of the 2ud and 5th Cor 2nd and 4th) joints. In the 7-joiuted form (which may 

 he the result of parasitization) the 3rd joint equals in length the subsequent 

 three together. Mouth-parts large and conspicuous. Legs (fig. 2, c) small 

 and slender. There is frequently a fold partially crossing the middle of the 

 femur. In parasitized examples the femur is proportionately shorter and 



Fig. 2. — Lecanium zebrinum :■ a, antenna, 8-jointed, normal form, X 176; 

 a', antenna, 7-jointed form, X 176; b, posterior spiracle, X 176 ; 

 c, mid leg, X 176 ; d, marginal spines, X 176 ; e, adult female, 

 side view, X 2 ; /, adult female, dorsal view, X 2; g, haltere of 

 adult male, X 176. 



stouter. The tibia is conspicuously widened distally, and the tarsus con- 

 spicuously thickened proximally ; tarsus and claw together as long as the 

 tibia. Claw long and slender; digitules slender, slij^htly dilated at extremity ; 

 the unguals rather stouter than the tarsals. Spiracles comparatively large, 

 especially the posterior pair (fig. 2, b), in which the diameter of the external 

 aperture is equal to the length of the tibia of the mid leg. Valves of anal 

 operculum with from 7 to 10 long stout setae on the apical area. Anal ring 

 with 6 stout setae. Derm with scattered circular pores, but without con- 

 spicuous dermal cells, except on the denser parts where the pores appear to 

 be enclosed in paler areoles. Margin with a series of acute spines (fig. 2, d), 



