112 EXPLANATION OF TERMS 



Pseudogyna pupifera: in Aphids, the last generation of p. gciiiuiaus. 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 metamorphosis: 



includes the present Ephemeroptera, Odonata. Plecoptera, Isoptera and 



Corrodeiitia : = Archiptera. 

 Pseudonychium -ia: =: paronychia ; q. v. 

 Pseudo-nymph: := scmipupa ; 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., Mc/oidff; = semi-pupa ; (]. v. 

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



the living insects. 

 Pseudosessile: those petiolate Hymenoptera. 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 Diptcra, 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 Apliididcr, supposed to replace the absent 



Alalpighian tubules. 

 Psocoptera: ^= Corrodcntia : q. v. 

 Psycftogenesis: 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. 



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

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



the meso-pleural suture ; = the posterior lateral plate of meso-thorax of 



Lowne ; the episternum of meso-thorax of Hammond. 

 Pteropleural bristles: in Dipt era, 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 Tliysaiwptcra. 

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

 Pterrygodes: the patagia or tegulie ; (|. \'. 

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



descended from winged ancestors : see apterogogenea. 

 Pterygostium: a wing vein. 

 Pterygote: wing-bearing. 



