572 TERTIARY INSECTS OF NORTH AMERICA. 



arched, and the abdomen shows it to be a female. The antennal joints are 

 fifteen in number, the basal one stout, the apical slender obovate, the others 

 globular ; the palpi are four-jointed, the last three joints equal, and together 

 as long as the first, the whole rather longer than the head, and therefore 

 rather long for a Dicranomyia. The legs are lacking, the single wing 

 detached, broken at the base, and longitudinally folded. Such of the neura- 

 tion as can be disentangled agrees wholly with the peculiarities of this 

 genus. 



Length of fragment of body without head, 6 mm ; breadth of head, 0.5"""; 

 length of antenna-, 2 nim ; palpi, 0.9 mm . 



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



A second specimen is referred to this species, but with some doubt, as 

 it consists of only a trunlcwith no appendages excepting the male forceps. 

 The specimen is slightly smaller than the female, as we should expect, and 

 the plates at the extremity of the body differ from those of the other fossil 

 species described in being of a regular, short, obovate form. 



Length of body without forceps, 6.25 mra ; of forceps, 0.6 mm ; width of 

 same, 0.28 mm . 



Same locality. 



SPILADOMYIA Scudder 



Spiladomyia Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., Ill, 749 (1877). 



This genus is founded upon a peculiar form of fly allied to Dicranomyia. 

 The palpi are no longer than the head; the thorax is comparatively slender, 

 the legs very long and slender, and the wings shaped much as in Dicra- 

 nomyia, with a peculiar neuration. The auxiliary vein terminates some 

 way beyond the middle of the costal border ; the first longitudinal vein 

 terminates in the second, close to the tip of the wing; the second originates 

 from the first beyond the middle of the wing, but some distance before the 

 tip of the auxiliary vein; the third longitudinal vein originates from the 

 second, near the middle of its course, beyond the tip of the auxiliary vein; 

 a little distance beyond its origin, but much nearer the tip of the wing than 

 usual, it is connected by a cross-vein with the fourth longitudinal vein ; 

 the first and second posterior cells are therefore very short ; there is, then, 

 but a single submarginal cell, three, or, if a very slight fork at the apex 

 of the posterior branch of the fourth longitudinal vein be counted, four 

 posterior cells, and no discal cell. 



