GLOSSARY OF TERMS. Xlll 



-Mesothorax. — The second or middle segment of the thorax ; bears the 



middle legs and anterior wings. 

 Metathorax. — The third segment of the thorax ; bears the hind legs and 



second pair of wings. 



Notum. — The dorsal or upper part of a segment of the thorax. 



■Obsolescent. — Becoming obsolete. 

 Obsolete. — -Nearly or entirely lost. 

 Onychium. — The tarsal claw. 



Paramerum. — A small plate in the lateral ventral part of the mesothorax. 

 Parapleurum. — A lateral plate of the first abdominal segment. 

 Parasterrium. — A large thoracic ventral plate extending obliquely 



dorsad and mesiad from the meral suture, separating the meral and 



sternal parts of the sternite, to the membrane connecting meso- 



and pro thorax. 

 Paronychium. — Two (or sometimes one) slender lobes arising from the 



tarsal claw ; the so-called false claws. 

 Pectinate. — Comb-shaped ; with even branches like the teeth of a comb. 

 Penis- funnel. — An aperture with raised and chitinized edges, situated 



between the tenth abdominal sternite and the ninth, from which 



protrudes the penis -sheath. 

 Penis-sheath. — The outer chitinized covering of the membranaceous 



penis ; also called the aedeagus. 

 Peristernum. — An anterior ventral plate of the mesothorax. 

 Pilifer. — A small sclerite, in the form of a hairy process, at each side 



of the clypeus. 

 Postscutum. — The third posterior dorsal plate of the anterior thorax. 

 Prsescutum. — The small anterior plate of the thorax. 

 Pro. — Anterior. 

 Prolegs. — The fleshy unjoined abdominal legs of the larva ; those of the 



tenth segment sometimes called claspers. 

 Prothorax. — The first segment of the thorax ; bears the anterior legs 



but no wings. 

 Protomerum. — A small plate in the lateral ventral part of the thorax lying 



below the paramerum. 

 Proximal. — Nearest to the body. 

 Pulvillus. — A pad-like structure between the tarsal claws. 



Retinaculum. — A catch or bar on the underside of the fore wing, formed 

 by stiff bristles, scales, or projecting membrane, and serving to 

 engage the frenulum in flight. 



Rugose. — Wrinkled. 



Sclerite. — Any piece of the body-wall bounded by sutures. 



Scutum. — A dorsal area of the thorax. 



Seriate. — Placed in a row. 



Setiferous. — Bearing setae or bristles. 



Setiform. — In the form of a bristle or seta. 



Shagreened. — A surface roughened with minute tooth-like projections. 



