USED IN ENTOMOLOGY. 5 



Allux: next to the last joint of tarsus; in Rhynchophora. 



Alpine zone: = arctic zone, q. v. 



Alternation of generations: where a species that occurs in both sexes period- 

 ically produces only parthenogenetic females ; the latter, in turn, producing 

 the sexed form; occurs in Cynipidcc and some Homoptera: see heterogeny. 



Altus: above: applied to a part raised above the usual level. 



Alulae: Dipt era; a pair of membranous scales above the halteres, behind the 

 root of the wing, one above or before the other ; the anterior attached to the 

 wing and moving with it, the posterior fastened to the thorax and stationary ; 

 see calyptra ; squama ; squamula ; lobulus ; axillary lobe ; aileron ; scale ; 

 tegula? : Coleoptera ; a membranous appendage of the elytra which prevents 

 dislocation. 



Alulet: Dipt era; the lobe at basal posterior part of wing; = alar appendage; 

 posterior lobe ; and has been used as = alula. 



Alutaceous : rather pale leather brown [burnt sienna]: covered with minute 

 cracks, like the human skin. 



Alveolate: furnished with cells; deeply pitted. 



Alveolus: a cell, like that of a honeycomb. 



Amber: a transparent, clear, pale yellowish brown; of the color of amber [a 

 mixture of pale cadmium yellow and a little burnt umber]. 



Ambient vein: Dipt era; the costal vein when it extends beyond the apex and 

 practicaUy margins the wing. 



Ambrosia: bee-bread: the food cultures of certain Scolytid beetles. 



Ambulatoria: that series of Ortlwptera in which the legs are fitted for walk- 

 ing only ; Phasmids. 



Ambulatorial: fitted for walking or making progress on the surface. 



Ambulatorial setae: specialized hairs or bristles, situated on the ventral seg- 

 ments of the abdomen of some Coleoptera. 



Ambulatory: moves by walking; formed for walking. 



Ametabola -ous: insects without obvious metamorphoses, in which the larvae 

 usually resemble the adult and the pupae are active. 



Ametabolion: an insect that has no distinct metamorphoses. 



Amethystine -us: bright blue with a reddish admixture; clear like an ame- 

 thyst [between mauve and lilac]. 



Amnion: the inner of the two membranes enveloping the embryo. 



Amnion cavity: a tube-like insinking from the ventral plate of the embryo, 

 extending cephalad. 



Amnion fold: the extensions of the amnion which close the mouth of the 

 amnion cavity in the embryo. 



Amnios: the first cast skin of the larva when a moult occurs almost immedi- 

 ately after emergence from the egg. 



Amoebiform: having the appearance or properties of an amceba. 



Amoeboid: applied to movements similar to those of an amoeba. 



Amphibiotica: those pseudoneuropterous insects whose larva: are aquatic but 

 whose imagos are aerial ; stone-flies ; May-flies ; dragon-flies. 



Amphimixis: the mingling of the germ plasm of two individuals. 



Amphiodont: applied to those forms of male Lucanids bearing mandibles of 



