MYTILASPIS POMORUM. 197 



parallel, slightly widening towards posterior extremity ; 

 convex ; at about three-fourths from the anterior 

 extremity is a narrow, transverse, curved groove or 

 constriction, which acts as a hinge to allow of the free 

 escape of the male. Exuviae orange-yellow. 



Long. 1 mm. 



Male (PL XXIV, fig. 8) pale mauve or purple; 

 antennas and legs (PL XXV, figs. 4 7) of the same 

 colour, but the latter are faintly tinged with yellow ; 

 thorax and apodema pale brownish yellow, with 

 purplish shadings. Eyes black. Antennas with four 

 long clubbed hairs on apical joint ; all the rest of the 

 hairs are simple and pointed. Wings faintly hyaline ; 

 halters with a very long curved bristle. Legs with 

 the tibias and tarsi very hairy ; digitules slender and 

 faintly clubbed. 



Male pupa (PL XXIV, figs. 9, 10) pale mauve ; legs 

 and antennas colourless or faintly yellow ; ocelli black. 



Larva (PL XXIV, fig. 11) elliptical; translucent 

 white ; extremities yellow. Antennae of six joints, of 

 which the last is nearly as long as 2, 3, 4, and 5 

 together; formula, 6 (2, 3), 1 (4, 5). In the newly 

 hatched larvas the joints of the antennas are shorter 

 and stouter. Equidistant between the eyes on the 

 ventral surface are two long tubular spinnerets (see 

 also p. 72, figs. 810). 



Ova white. 



Habitat. Common everywhere ; is a great pest on 

 the apple, and occasionally so on the pear. It loves a 

 warm sheltered situation, and thrives best on a tree 

 occupying a south wall. Is a general feeder, but 

 occurs most freely upon the apple. The following is a 

 list of the food-plants : Sallow (Salix, spp.) ; Gotone- 

 aster, spp. (freely) ; black and red currant (Ribes, spp.) ; 

 hawthorn (Gratsegus), broom (Gytisus, sp.), Vaccinimn 

 myrtillus, heath (Erica, spp.) ; Calluna, sp. ; wild rose 

 (Rosa, spp.), mountain ash (Pyrus aucuparia), raspberry 

 (Rubus iddsus), sloe (Primus communis), Ceanothus, 

 G or mis alba, var. spaethii, Elgeagnns argentea. 



