USED IN ENTOMOLOGY. 35 



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

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



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



very prominent in the Carabidae. 

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



middle. 

 Trophi, instrumenta 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 



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



pectus, epigastrium. 

 Tubercle, a little solid pimple. 

 Tubercula, 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, auriculae, and laciniae. 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. 



Umbilicate, 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. 



Undulated, waved obtusely, without, any right lines, but in seg- 

 ments of circles. See flexuous. 



Unguiculate, armed with a hook or nail. 



Unguis, nail or claw, two incurved hooks which terminate the 

 tarsus. See pulvillus. 



Ungulate, hoof-shaped ; like a horse's hoof. 



Urceolate, pitcher-shaped ; swelling in the middle like a pitcher. 

 See infundibuliform, cyathiform. 



Utriculus, a little bag, or hollow vesicle. 



