USED IN ENTOMOLOGY. 13 



Arolium-ia: cushion-like pads on the tarsi of many insects: one of the lobes 



of the pulvillus ; in Orthoptera, used only for the terminal pad between the 



claws : see empodium ; pulvillus ; palmula ; plantula ; onychium, paronych- 



ium, pseudonychium. 

 Arquate: see arcuate. 

 Arrhenotokous: capable of producing male offspring only, as in worker bees 



and some saw-flies. 

 Arrhenotoky: parthenogenetic reproduction when the progeny are all males: 



see thelyotoky and deuterotoky. 

 Arthrium: Coleoptera; the minute, concealed tarsal joint in pseudotetramera 



and trimera. 



Arthroderm: the outer skin or covering of articulates. 

 Arthrodial: an articulation that permits motion in any direction. 

 Arthromere : a body segment or ring : somite. 

 Arthropleure: the side piece of an arthromere. 

 Arthropoda: all those articulates having jointed legs. 

 Article: a joint or segment. 

 Articular pan: the cup or dish-like depression forming the socket into which 



an articulation is fitted. 

 Articulata: that branch of the animal kingdom whose members are made up 



of rings, segments or articulations. 

 Articulate: divided into joints or segments. 

 Articulated apex: see clasp filament. 

 Articulation: the point or place where two parts or segments are joined: 



also applied to an individual joint or segment. 

 Articulatory epideme: the partly chitinized membrane by which the wings 



are attached to the thorax. 

 Artus: the organs of locomotion generally. 

 Asexual: applied where the reproductive organs are incompletely developed 



and eggs or young are produced by cell-budding : = parthenogenetic. 

 Ash-gray: a mixture of black and white, with a faint orange tinge: like 



ashes of anthracite coal. 

 Aspect: indicates the direction to which a surface faces dr in which it is 



viewed ; it may be dorsal, ventral, caudal, cephalic or lateral. 

 Asperities: surface roughenings or dot-like elevations. 

 Aspersus: rugged, with distinct elevated dots. 

 Assembling: gathering together; applied when a virgin female is exposed to 



attract such males as may be near, either to secure a pairing or merely to 



obtain specimens ; also called sembling. 



Assurgent: down-curved at base, then upcurved to an erect position. 

 Asymmetrical: not alike on the two sides; not symmetrical. 

 Asymmetry: a state of unlikeness in lateral development; absence of sym- 

 metry in form or in the development of members. 

 Ater: deep black; not shining. 

 Aterimus: the deepest black. 

 Athericerous: see aristate. 

 Atom -us: a minute dot or point. 



