USED IN ENTOMOLOGY. 



53 



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



Fore-intestine: =foregut, q.v. 



Forficate: = forcipate. q. v. 



Forks: Trichoptera; forks of veins in apical part of wing, numbered i, 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 -ae: = fossu'a ; q. v. 

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



optera, 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: Diptera (Will.), = media 2 (Comst.). 

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

 Foveate: with foveas or pit-like depressions. 

 Foveolate: with shallow cavities like a honey-comb. 

 iractus: 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 pupa? when all the parts and appendages are separately 



encased as in Coleoptcra. 

 Frenatas: 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 occur 



