568 TERTIAEY INSECTS OF NORTH AMERICA. 



on the stone.) Discoidal cell about three times as long as broad ; second 

 basal 'cell about half as long- as the wing. Legs very slender, the tarsi 

 longer than the tibise, and the hind tibia? at least with an outer row of short 

 spines. on the apical third ; all the legs sparsely covered with not very long 

 hairs. Abdomen very thinly clothed with distant, moderately long, slender 

 hairs. 



Length of body, 4.5 mm ; of wing, 3.5 ram ; of hind leg, 4.2 mm ; of hind 

 tibiae, 1.3 mm ; of hind tarsi, l.C mm 



Green River, Wyoming. One specimen, No. 12 (Dr. A. S. Packard). 



NEMATOCERA Latreille. 



Family TIPULID^E Leach. 



DICRANOMYIA Stephens. 



DlCRANOMYIA STIGMOSA. 



PI. 5, Figs. 16, 17, 25-27, 42, 43, 08, 69. 

 Dicranomyia stigmosa Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., 111,746-748 (1877). 



The neuration and the presence of a stigma in a fine, nearly perfect 

 specimen of this species indicate a form closely allied to D. pubipennis 

 0. S., but the absence of any pubescence at the tip of the wing at once dis- 

 tinguishes it from the recent species. At first I supposed that it differed 

 from other species of Dicranomyia in the absence of the auxiliary vein ; but 

 after careful study a faint trace of its apical portion was found in the same 

 position relative to the origin of the second longitudinal vein as in D. pubi- 

 pennis; as there also, the first longitudinal vein curves downward to, and 

 terminates on, the second longitudinal vein, directly opposite the cross-vein 

 uniting the discal cell with the third longitudinal vein, instead of on the 

 costa ; the subcostal cross-vein arises before the deflection of the first lon- 

 gitudinal, runs parallel witli it until it curves, when it turns in the opposite 

 direction to the costa. The discal cell is closed, but the cross-vein separat- 

 ing it from the second posterior cell is very faint, in which respect it agrees 

 better with other Dicranomyise than with D. pubipennis. The stigma is 

 confined to that part of the space between the first and second longitudinal 

 veins which lies beyond the origin of the third longitudinal vein, but it also 

 extends upward to the costa; it is nearly circular and faintly fuliginous. 



