342 GLOSSARY. 



Onychium. See Plantula. 



Oval. Egg-shaped. 



Ovate. More or less oval. 



Palpi. The feelers attached to the mouth of insects. 



Pectus. The breast, or inferior surface of the thorax. 



Petiolated. Narrowed into a handle-like neck ; as the base of the wings 



in Agrion. 



Phalerated. Marked with stripes and bands like the harness of a horse. 

 Piceous. Color of pitch. 



Pile. Hair ; usually hair arranged somewhat in rows. 

 Pilose. Clothed with pile. 

 Plantula. A small lap or membranous appendage between the tarsal 



nails of insects ; also called Onychium. 

 Plicated. Furnished with folds ; folded. 

 Fostcostal, or Postcubital. Pertaining to the space between the nodus 



and pterostigma. 



Posteriorly. Behind ; after. 9 



Process. A prolongation of the surface, such as an ear-like elevation, &c. 

 Produced. Drawn out ; prolonged. 

 Prothorax. The first segment of the thorax. 

 Pruinose. Clothed with bluish or white bloom or powder. 

 Pterostigma. A more or less colored mark upon the anterior margin 



before the apex of a wing, between the costal and the following 



longitudinal vein. 



Pterostigmatical. Pertaining to Hie pterostigma, or its locality. 

 Pubescent. Clothed with short, soft, fine hair or down. 

 Punctiform. Shaped like a point or dot. 

 Pyriform. Shaped like a pear. 

 Quadrangular space. The space immediately beyond the basal one and 



in front of the median space of the wings. 

 Radius. The vein just behind the subcostal one. 

 Raptatorial. Adapted for seizing prey. 

 Recurved. Curved backwards. 

 Reniform. Kidney-shaped. 



Reticulated. Furnished with veining or marking like network. 

 Reticulation. Veining, or marking like the meshes of a net. 

 Rhinarium. The nostril-piece ; a portion of the nasus, or its equivalent 



when reduced in size. 

 Rhombical. Quadrangular, with two opposite angles acute and two 



obtuse. 



Rhomboidal. Somewhat in the shape of a rhomb. 

 Rufescent. Somewhat reddish. 

 Rufous. Reddish. 

 Rugose. Wrinkled ; furnished with numerous rough, small elevations 



like wrinkles. 



Rugulae. Minute wrinkles. 

 Rugulose. Minutely wrinkled. 



