194 MYTTLASPIS. 



and may or may not be clearly indicated. Ventral 

 scale complete, can rarely be removed intact ; it usually 

 raptures along the centre. The female usually has five 

 groups of circumgenital glands, and subdorsal, inter- 

 mediate, and anterior series of tubular spinnerets. 



The male puparium closely resembles that of the 

 second-stage female, but is less dilated at the posterior 

 extremity, is convex or flat, and without carinse ; is 

 faintly constricted or hinged towards the posterior 

 extremity, and is composed of the same kind of 

 coriaceous secretion as that of the female. It is never 

 felted as in Diaspis, Poliaspix, Chionaspis, etc. 



The perfect male has the prothorax very much pro- 

 duced, which throws the insertion of the win us far 

 back, giving the insect an overbalanced appearance. 



SYNOPSIS OP SPECIKS. 



A. Grouped circumgenital glands well separated. 

 a. Abdominal free segments rounded. 



(i) . . . POMOIMM. 



B. Three anterior groups of circumgenital glands con- 



tinuous. 



a. Abdominal free segments as in pomornm. 



(n) . . . . Ficrs. 



b. Abdominal free segments tuberculate. 



(ill) .... PlNN^EFORMIS. 



MYTILASPIS POMORUM (Bouche). 



(PL XXIV, figs. 111; PL XXV, figs. 19; PL 

 XXVI, fig. 2 ; PL XXVII, fig. 5.) 



Aspidiotus pomorum, Bouche ; Ent. Zeit. Stett., 



1851, xii, No. 1, p. 110. 

 Aspidiotus conchiformis, auctorum ; nee Gmelin, Syst. 



Nat., ii, 221. 

 Mytilaspis pomonnn (Bouche) ; Signoret, Essai, p. 



142, pi. vi, fig. 9. 



