750 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



Sj)iladomyia sim])Jex. — A single specimen and its reverse show nearly 

 all the parts of the body, but all are faintly preserved, so as to be very 

 difficult of study. The specimen is a female j nearly all the legs are pre- 

 served, and all but the base of the wings; the latter, however, trail 

 along the abdomen, so that parts are obscured, and the neuration is ex- 

 ceedingly faint. The head is small, the eyes almost exactly circular, 

 the palpi a little shorter than the head, the antennae composed of cylin- 

 drical joints, a little longer than broad, the legs slender, with femora, 

 tibiie, and tarsi of nearly equal length, and the wings as long as the 

 body. The anterior branch of the fourth longitudinal vein is abruptly 

 bent at its base, so as nearly to connect with the cross- vein uniting it 

 with the third longitudinal vein, and the first and second posterior cells 

 are scarcely more than three times as long as broad. The third posterior 

 cell is but very insignificant, as the posterior branch of the fourth lon- 

 gitudinal vein forks but slightly, and near its tip. The neuration of the 

 lower part of the wing is uncertain. .Length of bodyT.S™"'; palpi 

 0.35™™; fore femora 4.5™™; middle femora 4.5™™; hind femora 4.5™™; 

 fore tibife 4.65™™ ; middle tibisTe 4.5™™ ; hind tibiae 4.5™™ ; fore tarsi 

 4™™; middle (or hind) tarsi 4.5™". Mjasarements of tarsi uncertain. 

 C agriu Valley. 



Pronoi^hlchia {-pu)>, ^/J^Sm^), uov. gen. 



This genus differs from all Tipulidw known to me, in the early origin 

 of the third longitudinal vein, which springs from the second almost im- 

 mediately after its own separation from the first longitudinal vein, and 

 some way before the tip of the auxiliary vein ; the second longitudinal 

 vein arises near the middle of the wing, and branches, the inner branch 

 apparently forking near its tip. These characteristics readily serve to 

 distinguish it from other TijmUdce. The head is smallj^the antennae long, 

 very slender, and more than thirteen-jointed. They are too imperfect in 

 the specimen studied to allow of any further statement. The palpi are not 

 preserved, but the thorax is strongly arched, and the neuration indicates 

 that the genus belongs to the Ti])uUd(e hrevipalpl, and with other signs, 

 that it is probably one of the LivinojyMlina, although the auxiliary cross- 

 vein appears to be exactlj' opposite the origin of the second longitudinal 

 A^ein. It is perhaps most nearly allied to Tricfiocera. 



PronopMehia rediviva, — The single specimen of this species is spread 

 at fall length, but the stone containing it is broken. The specimen is 

 a male. The antennae are considerably longer than the head and thorax 

 together, and the joints are shaped and ornamented as shown in the figure 

 of Dolicliopeza in Walker's Diptera Britannica. The head is small, and 

 the eyes so well preserved that they can be seen as in a living creature. 

 The wings are very long and slender ; the auxiliary vein terminates 

 some distance beyond the middle of the wing ; the first longitudinal 

 vein about midway between that and the tip ; the second longitudinal 

 vein arises jnst within the middle of the wing, and the third longitudi- 



