158 AMERICAN ENTOMOLOGY. 



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



sides parallel. 

 Tricliotomous, dividing by tlirees. 

 Tricuspidatc, ending in three points. 

 Tridactyloiis, having three toes or claws. 

 Trigonate, three-cornered. 



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

 Trochanter, the second joint of the feet, preceding the thigh or 



ftmnr; it is also the second joint of the ai^iiliyds ; it is very 



prominent in the Carabidae. 

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



middle. 

 Troplii, instrumenta cibaria ; feeders ; parts of the mouth taken 



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



mandibles, maxillse, palin, lahium,. 

 Truncate, cut off" square at tip. See emargtnate, sinus. 

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

 tween the head and abdomen, including loings, feet, thoi-ax, 

 pectus, epigastrium. 

 Tubercle, a little solid pimple. 

 Tubemda, an elevated triangular process at the anterior angle of 



the thorax, particularly in Hymenoptera. 

 Tubulons, formed like a tube ; fistulous. 



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

 fulcrum, auriculse, and lacinisi. 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. 

 TMr^Ji^wie, top-shaped ; nearly conical; it diff"ers from pyriform 



in being shorter and more suddenly attenuated at base. 

 Turgid, swollen. 



U. 



Umbilicate, resembling a navel. 



i'mhonatc, bossed, having an elevated knob in the centre. Sec 



gibbous. 

 Uncinate, hooked at the end. 

 Unequal, opposed to equal; differing in length. 



