210 ISCHNASPIS FILIFORMIS. 



The larval exuviae are terminal, and covered by a 

 very thin transparent secretion, which forms equi- 

 distant rounded processes all round the margin. 

 These appendages entirely disappear on being boiled 

 in caustic potash. 



The male puparium resembles that of the second- 

 stage female, and is from one-fourth to one-third the 

 length of that of the female. It differs from 

 in having no central hinge. 



ISCHNASPIS FILIFORMIS (Douglas). 

 (Plate XXVIII, figs. 19.) 



Isclmaspis filiformix, Douglas ; Ent. Mo. Mag., vol. 



xxiv, p. 21, figs. 13, 1887. 

 ? Mytilaspis longirostris, Signoret; Bull. Soc. Ent. 



France, 1882, p. xxxv. 



Puparium of adult female (figs. 2, 3) very long and 

 narrow, about eight times longer than broad; sides 

 parallel, posterior extremity very slightly broadest ; 

 very convex ; shining black, margins greyish. Larval 

 exuviae orange-brown, central area with a rich cas- 

 taneous blotch ; cabinet specimens pale, dull yellow, 

 with the central blotch or blotches rusty brown ; 

 secretionary covering thin and transparent, forming at 

 the sides a series of equidistant rounded projections; 

 second exuviae, occupying about one-fourth of the 

 puparium, covered with a dense black, shiny secre- 

 tion, like the remainder of the puparium. Ventral 

 scale (fig. 3) complete, thick, white or greyish, with 

 yellow stains ; it generally comes away unbroken from 

 the food-plant. 



Long. 2 3 mm. 



Adult female (figs. 5, 6) very elongate ; sides 

 parallel ; broadest at the free abdominal segments ; the 

 latter, together with the pygidium, only occupy about 

 one-eighth of the entire length of the insect. Colour 



