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 Lcpidoptcra, -- media 1 (Comst), and is vein 5, or the 



independent, of the numerical series. 



Upper sector of triangle: in Odonata, = cubitus 1 (Comst.). 

 Upper Sonoran faunal area: that arid part of upper austral west of 100th 



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 



urinary tubules: composition, CsHUNiOs (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 



having 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 



