112 EXPLANATION OF TERMS 



Pseudogyna pupifera: in Aphids, the last generation of P. gcmmans, which 



produces the true sexes. 



Pseudogyne: a female that reproduces without impregnation. 

 Pseudo-halteres: the rudimentary primaries of Stylops. 

 Pseudo-neurium: a false vein formed by a chitinous thickening of a wing 



fold. 



Pseudo-neuroptera: those net-winged insects with incomplete metamor- 

 phosis : includes the present Ephemeroptera, Odonata, Plecoptcra, Isoptera 



and Corrodentia: =Archiptera. 

 Pseudonychium -ia: =paronychia; q. v. 

 Pseudo-nymph: = semi-pupa ; q. v. 

 Pseudopodia: =parapodia; q. v. 



Pseudoptera: an ordinal name for the scale insects (Amyot, 1847). 

 Pseudo-pupa: the inactive larval stage preceding the formation of the true 



pupa in some insects; e. g., Meloidce: = semi-pupa; q. v. 

 Pseudo-pupillae: in Odonata, the black spots seen on the compound eyes of 



the living insects. 

 Pseudosessile: those petiolate Hymcnoptcra, in which the abdomen is so 



close to the thorax as to seem sessile. 

 Pseudo-trachea: the ringed and ridged grooves on the labella of Diptera, by 



means of which they scrape their food. 

 Pseudova: egg-like germ cells capable of development without fertilization; 



e. g., in certain plant lice. 



Pseudovary: the organ or mass of germ cells of an agamic insect. 

 Pseudo-vitellus: a cellular organ in Aphidida, supposed to replace the absent 



Malpighian tubules. 

 Psocoptera: = Corrodentia; q. v. 

 Psychogenesis: the origin and development of social and other instincts and 



habits. 



Pterodicera: with wings and two antennae. 

 Pterogostia: the wing veins. 

 Pterogostic: referring to the wing structure. 



Pteropega: wing sockets or cavities into which the wings are inserted. 

 Pteropleura: in Diptcra, are situated below the base of the wings behind 



the mesopleural suture : = the posterior lateral plate of mesothorax of 



Lowne; the episternum of mesothorax of Hammond. 

 Pteropleural bristles: in Diptcra, are inserted on the pteropleura. 

 Pterostigma: a thickened, opaque spot on the costal margin of a wing, near 



its middle or at end of the radius : = bathmis, and see stigma. 

 Pterotheca: that part of the pupa that covers the wings. 

 Pterothorax: the wing-bearing thoracic segments in Thysanoptcra. 

 Pterygium: a lateral expansion of the snout of some Colcoptera. 

 Pterygodes: the patagia or tegulae; q. v. 

 Pterygogenea: insects that are winged in the adult stage or believed to be 



descended from winged ancestors : see apterogogenea. 

 Pterygostium: a wing vein. 

 Pterygote: wing-bearing. 



