Plant-Lice ajid Scale-Insects. 



89 



ing up altogether, its shell serving to cover and protect its infant brood till 

 they are able to spread themselves abroad on the plant in pursuit of nour- 

 ishment. The extreme scarcity of the males is marked in this group, few 

 of our most careful students of Entomology ever having met with them. 

 Bewildering are the relationships of their morphology in various stages, as 



Fig. 3- 



in the larvae of Dorthesia, whose regular but extraneous processes of a wax- 

 like substance infallibly suggest the singular lifeless attachments of the 

 larvae of the hag-moth, Phobetriwi pithccium, which, strange to say, are left 

 without the cocoon on pupation. The larvse of some Aleyrodes and Chcrmes 

 seem modelled after those of certain libellulae, or dragon-flies ; and the 



Fig- 4- 



male of some species of Coccus^ according to authors, has only two fully- 

 developed wings, and two long anal setae, like some Ephemerides. The 

 Coccidce are found on various plants, and sometimes in enormous numbers. 

 Fig. 5 represents the most abundant species in Eastern New England, be- 

 longing to the genus Aspidiotus of Bouche, in which the external covering 

 is not a part of the insect itself, but consists of a substance secreted by it. 



