AMERICAN ENTOMOLOGY. 139 



Heels, the spinulse. 



Hemelytra, scales, generally coriaceous at base, and membrana- 

 ceous at tip, not divided by a straight suture, and substituted 

 for the anterior wings, as in the Orthoptera and Hemiptera. 

 See tegmina. 

 Hemispheric, convex above and flat below, like the half of a 



globe. 

 Hepatic, liver-brown. 



Hexapode, having six feet, as in all true insects. 

 Hirsute, rough with strong hairs; shaggy. Sec pilous, villous, 



tomentous. 

 Hispid, bristly ; rough with stiff, short, sparse hairs. See stri- 



gose. 

 Hoary, covered with a fine white silvery substance or pubescence. 



See pruinous. 

 Homotene, retaining the primitive form ; referring to those arti- 

 culated animals with feet, that do not change their form with 



their vernantia. 

 Horizontal, (wings) when at rest parallel to the horizon. 

 Horns, a word used by some writers to designate the antennae. 

 Humerus, the region of the exterior basal angle of the elytra ; 



according to Meigen it is the anterior angles of the thorax in 



Diptera. 

 Hyaline, transparent; vitreous. 

 Hymenoptera, an order of insects, comprehending those with 



four membranaceous naked wings, as the bees and wasps. 

 Hijpocratcriform, salver-shaped. 

 Hypostoma, that portion of a Dipterous insect which is included 



between the antennas, the eyes and the mouth ; called by some 



naturalists clypeus. 



I. 

 Imago, the perfect insect, after having passed through the states 



of larva and pupa. 

 Imbricate, tiled; placed one over another like shingles on the 



roof of a house. 

 Immaculate, destitute of spots. 

 Immarginate, having no elevated margin or rim. 

 Imperfect, or incomplete metamorphose, is that species of change 



from the larva to the imago, in which the feet and win.-- of 



th.e pupa are immoveable, as in the Coleoptera, Lepidoptera, &c, 



