USED IN ENTOMOLOGY. 53 



Forehead: in Mallophaga, the head in front of the mandibles and antennae. 



Fore-intestine: = f oregut, q. v. 



Forficate: = forcipate, q. v. 



Forks: Trichoptera; forks of veins in apical part of wing, numbered 1, 2, 

 3, etc. 



Form: applied to representatives of a species which differ from the normal 

 or type in some uniform character ; it is seasonal if it occurs at a period 

 different from the type ; dimorphic if there is an alternation of generations 

 or two color patterns occur ; or sexual if the members of one sex differ 

 uniformly from those of the other. 



Formic: of, pertaining to or derived from ants. 



Formicary: an ant's nest or ant-hill. 



Fornicate: arched or vaulted: concave within, convex without. 



Fossa -se: =fossula; q. v. 



Fossoria: burrowers : in Orthoptera, the mole crickets and allies; in Hy- 

 menoptera, the digging wasps. 



Fossorial: formed for or with the habit of digging or burrowing. 



Fossula-ae: a deep groove or sinus with sharp edges: specifically applied to 

 grooves on the head or sides of prothorax in which the antennae are con- 

 cealed. 



Fossulate: a surface with oblong impressions. 



Fossulet: an elongated, shallow groove. 



Fourth longitudinal vein: Diptcra (Will.), = media 2 (Comst.). 



Fovea, Foveola-ae: a shallow depression with well-marked sides: a pit. 



Foveate: with foveaa or pit-like depressions. 



Foveolate: with shallow cavities like a honey-comb. 



Fractus: broken: also applied to a geniculate antenna. 



Fragile: easily breakable: thin and brittle. 



Frass: the excrement; usually the excreted pellets of caterpillars. 



Free: unrestricted in movement: not firmly joined with or united to any 

 other part : said of pupse when all the parts and appendages are separately 

 encased as in Coleoptcra. 



Frenatae: that series of Lepidoptera in which a more or less well-marked 

 frenulum occurs. 



Frenate: having a frenulum. 



Frenulum: the spine, simple in males, compound in females, arising from the 

 base of secondaries in many Lepidoptera, whose function it is to unite the 

 wings in flight : in Cicada the triangular lateral piece on the mesonotum 

 which connects with the trochlea : the anal area of secondaries and thus 

 = tendo, q. v. 



Frenulum hook: in the males of frenate Lepidoptera, a hook or fold into 

 which the frenulum is fitted. 



Frenum: that which holds things together: a lunate or triangular portion 

 at the inner and hinder base of the wing in Odonata and Trichoptera: 

 see tendo. 



Fringe -es: an edging of hair, scales or other processes extending well 

 beyond the margin and usually of even length: in Lepidoptera, fringes 



