490 



NORTH AMERICAN DIPTERA 



Proboscis — The mouthparts exclusive of the palpi; always more or less tube- 

 like. They may be slender and adapted for piercing, or thick and adapted 

 for lapping. 



Proclinate — Curving or directed forward. 



Pronotum — The dorsum of the prothorax. 



Propleura — The sides of the prothorax. This is usually a depressed area, but 

 also includes the area above the front coxse. 



Propleural bristle — A bristle situated on the propleura immediately above the 

 front coxae. 



Prosternum — The under side of the prothorax, between and in front of the 

 anterior coxae. 



Prothoracic bristle — A bristle situated immediately above the anterior coxae 

 (See propleural bristle). 



Prothorax — The first segment of the thorax. The first pair of legs arise from 

 the prothorax. 



Pruinose — Covered with a hoary dvist. (See pollinose). 



Pseudosutural foveae — Impressed polished areas on the humeral portion of the 

 mesonotum (humeral pits); in Tipulidae and elsewhere. 



Pteropleura — A sclerite lying below the base of the wings. 



Pteropleural bristle (s) — Bristle or bristles on the pteropleura. 



Pteropleurites — The upper and lower sections of the pteropleura. 



Ptilinum — An inflatable sac, occurring in Cyclorrhaphous flies and pushed out 

 above the antennas by the insect in emerging from the pupa (or puparium). 

 This sac is coarsely grained or pubescent and when forced out thrusts the 

 face into a horizontal position and when retracted after emergence leaves 

 the frontal lunule exposed and is concealed in part beneath the facial 

 ridges. 



Pubescent — Having very short, fine hair. 



Foot of house-fly, showing claws, pulvilli and the hair-like empodium. 



Pulvilli — Pads borne on the apical segment of the tarsus between the claws. 



Pulvilliform — Shaped like the pulvilli. 



Punctate — Pitted; covered with small pits. 



Puparium — The pupa when formed within the hardened larval skin. 



Pupiparous — Giving birth to larvae ready to pupate. 



Radial — Pertaining to the radius. 



Radial cell — Any cell bordered in front by a branch of the radius. 



Radius — The first to third longitudinal veins. Ri to Rs of Comstock-Needham 



system. 

 Raptorial — Fitted for grasping prey. 

 Reclinate — Curving or directed backward. 



Recui'rent — The anterior end nearer the base of the wing than some other part. 

 Reniform — Kidney-shaped. 

 Reticulate — Having a network. 



