USED IN ENTOMOLOGY. 71 



Jugular sclerites: small sclerites in the membrane connecting the head with 



the thorax : see cervical sclerites. 

 Jugulum: that sclerite just behind the sub-mentum ; = gula : that cavity of 



the posterior part of the head to which the neck is annexed : the lateral 



and under parts of the prothorax. 

 Jugum: in certain Lepidoptera and Trichoptera, a lobe or process at the base 



of primaries, overlapping secondaries and holding the two together in 



flight. 



K 



Katabolic: the destructive change from animal tissue to waste product: see 

 anabolic. 



Keel: an elevated ridge or carina. 



Kermesinus: dark red, with much blue [purple lake]. 



Key: a tabular or other arrangement of species, genera or other classifica- 

 tion according to characters that serve to identify them. 



Kidney-shaped: like a kidney in outline; convex on one long side, concave 

 on the other, the ends evenly and somewhat obtusely rounded : bean-shaped. 



Knee: the point of junction of femur and tibia. 



Labellum-a: the sensitive ridged tip of the mouth structures of certain 

 Dipt era: a prolongation of the labrum covering the base of rostrum in 

 Colcoptcra and Hemiptera. 



Labial: referring, pertaining or belonging to the labium. 



Labial segment: the 7th segment of head = second maxillary segment. 



Labial suture: is between labium and mentum. 



Labiate: lip-like or having lip-like sutures. 



Labipalp: a labial palpus. 



Labis: the slender abdominal forceps in some Lepidoptera. 



Labium: the lower lip: a compound structure which forms the floor of the 

 mouth in mandibulate insects, behind the first maxilla and opposed to the 

 labrum; formed by a fusion in embryonic life of separate right and left 

 maxilla-like halves : in some of its developments referred to as the tongue. 



Labial: belonging or referring to the labium. 



Labral suture: is between labrum and clypeus. 



Labro-frontal lobes: of brain, = trito-cerebrum ; q. v. 



Labrum: the upper lip; covers the base of the mandible and forms the roof 

 of the mouth. 



Labrum-epipharynx: in the mouth of piercing Diptcra is the central un- 

 paired lancet. 



Lac: a mixture of resin, wax and other substances produced by certain scale 

 insects as a protective covering. 



Lacer: a lappet; applied to a margin with irregular, broad and deep emargi- 

 nations, leaving lappet-like intervals. 



Lacerated: ragged; torn in appearance: see lacer. 



