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 Hymenoptera; 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- 

 viduals arise as buds from the germ body of the parent. 



Gena-se: the cheeks; includes that portion of the head on each side below 

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

 eyes and clypeus and mouth parts : in Diptcra 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. 



Generalized: 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: Orthoptera; 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 Lepidoptera, 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 

 processes 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 Diaspince, takes the form 

 of a long mucronate spike. 



Genital tuft: in Lepidoptera; 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 unique or 

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



Genolectotype: the one species of a series selected as the type of the genus 

 in which the describer of the genus placed it, subsequent to the description. 



Genosyntype: one of a series of species upon which a genus is founded, no 

 one species being mentioned as type. 



