nirii;i;.\ TIITUD.K. 569 



An oblique supernumerary vein runs to tlie 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, loi 

 than the thickness of the stout costal vein. The antenna; are fonrteen- 

 jc tinted, about twice as long as the head, the basal joints of the Hagelluin 

 suhglubular, the others obovate, the apical one more than twice as lung 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, deeplv 

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

 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 mm ; antennae, 1.2 mm ; wings, 

 7.5 mm ; anal lobes of male, 0.55 mm . 



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, butis 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 win^s, 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 

 cstal and first longitudinal veins throughout nearly its whole length. 

 \Vhat is apparently the rostrum is a very little longer than the basal joint 

 of the anteim.-e and a very little shorter than the head. The character (' 

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

 as tlniM- previously mentioned, but the stigma of the wing is lost 1>\ the 

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

 catelv hair\ throughout, with no sign of spurs, although it .should lie 

 remarked that the extremities of the tibia- are not well piv-erved. 



Length of middle femora, 5.25"" ; middle tibia', 1..V ; hind femora, 

 -t.Tft""" ; hind til.i;r. 5.5 



Chagrin Valley, White River, Colorado ( W. 1 teuton.) 



