PLATE CXIX. 

 Chermes abietis. (Page 24.) 



Fig. 1. — Half section of a portion of a twig of 

 the spruce fir, showing how, by irritation of the 

 rostrum of the queen Chermes, an approximation of 

 the opposite sides of the leaflets is affected at b. A 

 cavity results at a which encloses the insect, and 

 finally the leaves form one of the cells of the false 

 cone as seen on Plate CXVL 



Fig. 2. — Appearance of one of the cells of the false 

 cone after one of the scales has been raised. All the 

 pupse are seen ranged side by side with their heads 

 outwards, ready to escape after their change into 

 imagos. 



Chermes laeicis. (Page 33.) 



Fig. 3. — Underside of a larva, just after it has 

 moulted or shed its skin. The long hair-like seta) 

 proceed from the rostrum at r to the empty sheath at 

 s on the slough. This kind of retaining cable is to 

 be seen also in other species of Chermes. 



Fig. 4. — Portion of a larch leaf, on which the foun- 

 dress is seated surrounded, at o, by her pedunculated 

 eggs. These are of different colours, according to 

 their conditions of maturity. At t a globule of resin 

 is seen partly covered by cotton. This small drop is 

 very constantly seen, wherever the Chermes fixes her 

 station. 



Fig. 5. — Antenna and proboscis of the last figure. 



Figs. 6 and 7. — Magnified views of the rostrum and 

 foreleg. 



Fig. 8. — A tuft of pedunculated pseudova, cleared 

 from the cottony covering. 



Fig. 9. — Antenna of tlio winged female, showing the 

 annulated f orm of the principal joints. 



