146 EXPLANATION OF TERMS 



Upper margin: of tegmina (Thomas), corresponds to the posterior or anal 

 margin of most authors. 



Upper median area: see areola. 



Upper radial: in Lepidoptcra, = media i (Comst.), and is vein 5, or the inde- 

 pendent, of the numerical series. 



Upper sector of triangle: in Odonata, = cubitus i (Comst.). 



Upper Sonoran faunal area: that arid part of upper austral west of looth 

 meridian ; covers most of plains in eastern Montana and Wyoming, s. w. 

 South Dakota, west. Nebraska, Kansas, Oklahoma and Texas, and east. 

 Colorado and New Mexico ; covers plains of Columbia, Malheur and Har- 

 ney in Oregon and Washington. In California encircles Sacramento and 

 San Joaquin Valleys and forms a narrow belt around Colorado and Mohave 

 deserts. In Utah covers Salt Lake and Sevier deserts. In Idaho the Snake 

 plains. In Nevada and Arizona irregular areas of suitable elevation. 



Uranidin: a yellow coloring matter in some Coleoptera and Lepidoptera. 



Urceolate: pitcher-shaped; swelling in the middle. 



Ureter: the stalk connecting the malpighian tubules, when they form large 

 tufts, with the intestine. 



Uric acid: the characteristic nitrogenous excretion of the malpighian or urin- 

 ary tubules: composition, C5H4N403 (von Fiirth). 



Urinary vessels: = malpighian tubules; q. v.: has also been applied by older 

 authors, to anal glands. 



Urite: an abdominal segment and, specifically, its ventral portion. 



Uromere: any of the abdominal segments of an arthropod. 



Uropoda: any of the abdominal feet of arthropods. 



Uropygium: the ovipositor when it is a mere extension of the abdominal 

 segments. 



Urosome: the abdomen. 



Urosternite: the sternal or under piece of the uromeres. 



Urticating: nettling; applied to specialized hairs or processes on the bodies 

 of certain caterpillars, which cause a stinging or burning sensation on the 

 skin. 



Ustulatus: scorched: applied to a maculation that has the appearance of hav- 

 ing been burned in. 



Uterus: the vaginal portion of oviduct: the sometimes enlarged portion of the 

 vagina at junction of the oviducts : := calyx, q. v. 



Uterus masculinus: a pouch or sac into which the ductus ejaculatorius opens 

 in the Symphyla. 



Utriculi breviores: small vesicular sacs connected with the seminal vesicles 

 in crickets and some other insects. 



Utriculi majores: large vesicular sacs or tubular structures connected with 

 the seminal vesicles in crickets and some other insects. 



Utriculus: a little bag or hollow vesicle. 



V 



Vacuolate: with vacuoles or small cavities, empty or filled with a watery fluid. 

 Vagina: the tubular structure formed by the union of the oviducts in the 



