DirTERA— TIPULIDJ]}. 571 



of D. stigmosa in the shape of the discal cell, the inner border of which is 

 straight, and sti'ikes the incomplete fifth longitudinal vein exactly where the 

 lower cross-vein strikes it, so that the two are continuous aiid produce no 

 break of direction in the fifth longitudinal vein. The auxiliary vein is not 

 preserved, and there is no adventitious vein in the stigma, which otherwise 

 is as in that species. The wing is not so slender as in D. stigmosa. 



Length of body, 5.5""°; wing, 5.5-6"""; femur, 5"'"'; tibia, 5.75""'; 

 first two joints of tarsi, 3.5"'™. The measurements of the leg are doubtful. 



Fossil Canon, White River, Utah. (W. Denton.) 



Another poorly preserved specimen which by the structure of the male 

 forceps is plainly to be referred to this genus is judged merely from its size 

 to belong to this species, none of the characteristic parts of the neuration 

 being preserved. The bod}^ is a very little smaller than in the females of 

 this species, and the male forceps are ovate and rather large. 



Length of body without forceps, 4.5'°°' ; forceps, 0.35°'°' ; breadth of 

 one of them, 0.2""'. 



On the same stone with this is a leg which probably belonged to it, 

 tliough some distance from it ; the length of the femur is S"""" ; tibia, 4.5""" ; 

 the tarsi are broken. 



Same locality. 



A single wingless male, taken by Mr. Richardson at Green River 

 Wyoming, can be referred doubtfully to this species. 



About fifteen other specimens of Tipulidse were collected by Mr. 

 Richardson, Mr. Bowditch, and myself at Green River; but unfortunately 

 not one of them presents the vestige of a wing and seldom anything more 

 than the body. Probably some of them also belong to this species ; others 

 may with more doubt be referred to D. stigmosa but all are valueless for 

 any precise determination, and, indeed, may not belong to Dicranomyia 

 at all. 



Dicranomyia rostrata. 



PI. 5, Figs. 40, 41, 63, 64. 



Dicranomyia rostrata Scadd., Bull. U. S. Geol. Geogr. Surv. Terr., Ill, 749(1877). 



A single specimen larger than the other species of Dicranomyia and 

 about the size of Tipula decrepita Scudd. is provisionally referred to this 

 genus. The head is very small, the thorax rather robust and very strongly 



