56 



EXPLANATION OF TERMS 



Gastrula: that embryonic stage resembling a sac, with an outer layer of epi- 

 blastic cells and an inner layer of hypoblastic cells. 



Gastrulation: the process of forming a gastrula. 



Gathering hairs: the soft, flattened, often hooked hairs on the tongue of 

 bees and other Hyinciioptcra ; =; hooked hairs. 



Gelatinous: of a jelly-like texture or consistency: viscid. 



Geminate: arranged in pairs composed of two similar parts: doubled. 



Gemmate -us : marked with metallic or bright colored spots. 



Gemmiparous: applied to that form of asexual reproduction where new indi- 

 ■\iduals arise as buds from the germ body of the parent. 



Gena -se: the cheeks; includes that portion of the head on each side l^elow the 

 eyes, and extends to the gular suture : in Odonata the area between the 

 eyes and clypeus and mouth parts : in Diptera the space between the lower 

 border of the eye and oral margin, merging into face at front and limited 

 by the occipital margin behind. 



Genal bristles: Diptera; are on the cheeks near lower corner of eye. 



Geneialized: primitive: containing in combination characters that are sepa- 

 rated and specialized in other forms. 



Generation: used as the equivalent of brood; q. v. 



Genicular arc: Ortlioptera ; a curved dark marking on the posterior knee-joint. 



Geniculate: knee jointed: abruptly bent in an obtuse angle. 



Geniculum: a little knee or bend. 



Genital armature: all the processes concerned in copulation. 



Genital hamule: a little hook or plate covering the anal cavity of the male: 

 the supra-anal or genital hook: in Lcpidoptcra. the uncus: in Odonata, 

 in the plural, one or two pairs of lateral processes of the male genitalia on 

 the ventral surface of the second abdominal segment. 



Genital hook: =: genital hamule. 



Genitalia: the external organs of generation with all appendages. 



Genital lobes: in Odonata, a pair of backward and downwardly directed pro- 

 cesses from the 2d abdominal segment, between which the vesicle of the 

 penis lies. 



Genital papilla: in some Smynthurids, a tubercular elevation upon which the 

 genital aperture opens. 



Genital spike: the sheath of penis which, in male Diaspimc takes the form 

 of a long mucronate spike. 



Genital tuft: in Lefidoptera ; an expansible tuft of fine hair believed to be 

 scent-producing. 



Genital valve: Odonata: a chitinous piece on each side of the ovipositor, 

 derived from the sternum of abdominal segment 9 : probably = outer pair of 

 gonapophyses. 



Genoholotype: the species on which a genus is founded, whether uniiiue or 

 one of a series, specifically named as generic type by the author. 



Genolectotype: the one species of a series selected as the tyi)e of the genus 

 in which the de.icriber of the genus placed it, subse(|uent to the description. 



Genosyntype: one of a series of species upon wliicb a gt-inis is Icnnided, no 

 one species being inentioncd as tyi)e. 



