DIPTEKA— TIPULID^. 569 



An oblique supernumerary vein runs to the center of the stigma from 

 a point in the first longitudinal vein directly above the origin of the / 

 third; that is, from the inner edge of the stigma. The outer and posterior " 

 margins of the wing are profusely fringed with very delicate hairs, longer 

 than the thickness of the stout costal vein. The antennae are fourteen- 

 jointed, about twice as long as the head, the basal joints of the flagellum 

 subglobular, the others obovate, the apical one more than twice as long as 

 broad; they are delicately verticillate, the hairs being but half as long 

 as the width of the joints. The male anal lobes are broadly obovate, deeply 

 and abruptly excised externally at the base, so as to leave a sharp right 

 angle outwardly and a narrow peduncle on the inner side. Together the 

 lobes are broader than the tip of the abdomen, and each is about half as long 

 again as broad. 



Length of body, including the lobes, 6.5"™; antennae, 1.2°""; wings, 

 7.5"" ; anal lobes of male, 0.55"". 



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



A second specimen of what is apparently the same species, judging 

 from the anal lobes, is somewhat stouter, but is destitute of all other append- 

 ages, excepting indeterminate fragments of the rostrum, so that no further 

 knowledge of the species can be gained from it. The rostrum, however, 

 would seem to be scarcely longer than the head. 



Chagrin Valley, White River, Colorado (W. Denton.) 



In another specimen, also a male, the body, one of the wings, and part 

 of the legs of one side are preserved; the whole is much fainter than in the 

 other specimens, but the auxiliary vein can be traced midway between the 

 costal and first longitudinal veins throughout nearly its whole length. 

 What is apparently the rostrum is a very little longer than the basal joint 

 of the antennfe and a very little shorter than the head. The character of 

 the male appendages adds to the proof that this belongs to the same species 

 as those previously mentioned, but the stigma of the wing is lost by the 

 incompleteness of the preservation. The legs are very slender and deli- 

 cately hairy throughout, with no sign of spurs, although it should be 

 remarked that the extremities of the tibias are not well preserved. 



Length of middle femora, 5.25"" ; middle tibiae, 4.5"" ; hind femora, 

 5.75"" ; hind tibiae, 5.5"". 



Chagrin Valley, White River, Colorado (W. Denton.) 



