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EXPLANATION OF TERMS 



Translucid: clear: transparent enough to be seen through. 



Transparent: so clfar as not to obstruct vision. 



Transverse: when the longest diameter is across the body. 



Transverse incision: = transverse sulci. 



Transverse sulci: the transverse grooves of pronotum in many Orthoptera. 



Transverse suture: in Diptera, a transverse groove extending inward from 



the root of wing and obsolete in the middle of dorsum. 

 Trapeziform: in the form or shape of a trapezium. 

 Trapezium: a four-sided figure in which no two sides are parallel. 

 Trapezoid -al: a four-sided plane of which two sides are parallel and two are 



not. 

 Tri-: three; a combining form. 

 Triangle: in Odonafa: a small, triangular cell at the junction of cubitus with 



culjitus I : a similar cell adjoining it basally is the internal triangle : = 



discoidal triangle : cardinal cell : q. v. 

 Tri-articulate: composed of three joints or articles. 

 Tribe: a term of classification less than a sub-family: opinionative and ending 



in jHi ; but this is not universally adhered to. 

 Tri-carinate: with three keels or carinse. 



Trichogen: a hair-forming hypodermal cell in caterpillars, etc. 

 Trichoptera: hairy-winged: insects with hairy primaries with many longi- 

 tudinal veins and cells, covering the broader secondaries which are usually 



folded lengthwise ; mouth mandibulate but rudimentary ; head free ; thorax 



agglutinate ; metamorphosis complete. 

 Trichostical bristles: in Diptera, a fan-like row, situated on the meta-pleura : 



conspicuous in some families. 

 Trichotomous: divided by threes. 

 Trichroism: the condition when any given part exhibits three different colors 



in different individuals of the same species : e. g., in Lepidoptera, the hind 



wings of certain Heliconids. 

 Tricuspidate: ending in three points: with three cusps or teeth. 

 Tridactyle -ous: having three toes or claws. 

 Trifid: cleft into three parts or ends. 

 Trigonal: triangular: an area bounded by a triangle. 

 Trigonate: three-cornered; approximately triangular. 

 Trigoneutism: where three broods occur in one season. 

 Trigonulum: in Odonata, = triangle. 

 Trimera: that series of Coleoptera. in whicli there are only three tarsal joints 



present. 

 Trimerous: species which have the tarsi three-jointed. 

 Trinomial: that method of nomenclature in which a varietal or subspecific 



name follows the specific term without an intervening mark or indication of 



its rank. 

 Tripectinate: when an antenna has three branches or processes to each joint. 

 Triquetral: ^triquetrous. 

 Triquetrous: with three flat sides. 

 Tri-regional: divided into three distinct parts or regions. 



