16 EXPLANATION OF TERMS 



Fulcrum, the corneous body on which the base of the tubus, or 

 sheath of the tongue, in the Hymenoptera, rests ; it is " le 

 pivot" of Reaumur. 



Fuliginous, sooty ; of the colour of soot. 



Fulvous, orange-yellow. 



Furcated, forked ; terminating in two divisions. 



Fuscus, dark brown, with a slight mixture of gray. 



Fusiform, spindle-shaped ; gradually tapering more or less to 

 each end. 



G. 



Galea, helmet ; a dilated inarticulate membranaceous piece on 



each maxilla, that, together with the labrum, covers the 



organs of the mouth in the Orthoptera and some of the Neu- 



roptera. 



Gastric^ of or belonging to the belly. 

 Gelatinous, jelly-like ; having the consistence of jelly. 

 Geminate, situated in pairs. 

 Gena, cheek; a portion of the head on each side immediately 



beneath the eye, often turgid. 



Geniculate, knee-jointed ; bending abruptly in an obtuse angle. 

 Genus, an assemblage of species which correspond in particular 



characters. 

 Geometrse, larvae which when walking alternately elevate and 



straighten the middle of the body, as in those of the genus 



Geometra ; opposed to rectigrade. 

 Gibbous, hump-backed ; protuberant. 

 Glabrous, smooth ; opposed to hairy, downy, villous, &c. 

 Glaucous, gray-bluish-green. 



Globular, like a round ball; all the diameters equal. 

 Glochis, a barbed point. 

 Glomerate, congregated. 

 Glutinous, slimy, viscid. 

 Gracile, slender. 



Granulated, covered with small grains. 

 Gregarious, living in society, as many of the larvae of Lepidop- 



tera that fabricate a common web. 

 Griseus, light gray. 



Grub, the larva; generally applied to the immature Scarabaeus. 

 Gula, concave portion beneath the head, between the base of 



the mentum and thejugulum. 

 Gymnopterx, membranaceous and transparent wings without 



scales. 



