158 AMERICAN ENTOMOLOGY. 



Trapezium, a quadrilateral or four-sided figure with none of its 



sides parallel. 

 Trichotomous, dividing by threes. 

 Tricuspidate, ending in three points. 

 Tridactylous, having three toes or claws. 

 Trigonate, three-cornered. 



Triquetrous, three-sided; with three flat sides. See trigonate. 

 Trochanter, the second joint of t\efeet, preceding the thigh or 



femur ; it is also the second joint of the apophysis; it is very 



prominent in the Carabidas. 

 Trochlearis, pulley-shaped ; like a cylinder contracted in the 



middle. 

 Trophi, instruntenta cibaria ; feeders; parts of the mouth taken 



collectively, composed of five principal parts, viz. labrum, 



mandibles, maxillae, palpi, labium. 

 Truncate, cut off square at tip. See emarginate, sinus. 

 Trunk, or stethidium, that part of the body which intervenes be- 

 tween the head and abdomen, including wings, feet, thorax, 



pectus, epigastrium. 

 Tubercle, a little solid pimple. 

 Tubt rcula, an elevated triangular process at the anterior angle of 



the thorax, particularly in Hymenoptera. 

 Tubulous, formed like a tube; fistulous. 

 Tubus, a corneous sheath at the base of the tongue, including 



fulcrum, auriculse, and lacinise. Fabricius calls it the base of 



the tongue. Degeer names it " the intermediate piece of the 



sheath ;" Swammerdam also considers it " the sheath of the 



tongue." Latreille names it " la gaine." 

 Tunicate, composed of concentric layers enveloping one another. 

 Turbinate, top-shaped ; nearly conical ; it differs from pyriform 



in being shorter and more suddenly attenuated at base. 

 Turgid, swollen. 



U. 



Umbilkate, resembling a navel. 



Umbonate, bossed, having an elevated knob in the centre. See 



gibbous. 

 Uncinate, hooked at the end. 

 Unequal, opposed to equal; differing in length. 



