SCUDDER ON FOSSIL INSECTS. 755 



both ill this and the first nientioued specimeu, are delicate, and a little 

 more than half as long as the thickness of the tibiie. 



Gnoriste dentoni, — A single specimeu, a little broken, but otherwise in 

 good preservation. The head and thorax are nearly black, the abdomen 

 dark fusco castaneons. Legs and base of antennne fuscous. Wings 

 rather narrower at tip than in the European G. ajyicalis Hoft'm., hyaline, 

 covered with microscopic hairs, with a very slight and increasing iufas- 

 cation toward the apex, the veins testaceous, the costal and second and 

 third longitudinal veins much heavier than the others, and the fifth 

 longitudinal vein with its lower fork scarcely heavier than the veins 

 about it. The extreme tip of both wings is broken, so that the extent 

 of the costal vein cannot be seen ; but, in the approach of the proximal 

 end of the fork of the fifth longitudinal vein to tlie root of the wing, the 

 species agrees with the American G. megarhina O. S. more than with 

 the European species mentioned, for it lies scarcely further from the 

 base than the transverse vein connecting the first and second longi- 

 tudinal veins, and slightly nearer than the separation of the third and 

 fourth longitudinal veins. Only the basal four joints of the antennas 

 are preserved; the basal joint is obconic, broadly rounded at the apex, 

 nearly twice as long as broad, the other three cylindrical, the second 

 nearly half as long again as broad, the third and fourth less than a third 

 longer than broad. The legs are profusely covered with hairs, but the 

 hinder pair appear to be spineless, except at the apex of the tibia and of 

 each tarsal joint, where there are three or four slender and rather short 

 spines; the claws are very small and delicate, strongly curved, and 

 delicately pointed ; the short tibiae of the front legs, however, have at 

 least a single row of fine distant spines on the upper (?) edge. Length 

 of body 4.4™"; first joint ofantennte 0.2"""; second joint 0.125""" ; third 

 and fourth joints each 0.11"""; wings 4.5™"; middle (?) tarsi 2.2"""; first 

 joint of same 1.1"""; second 0.45"^'"; third 0.28""'; fourth 0.2"""; fifth 

 0.17""" ; claws 0.038"'"\ Fossil Cailon. 



Family Cyrtid^e. 



Acrocera hirsuta. — A single very fragmentary specimen appears to 

 belong in the neighborhood of Acrocera, but is too imperfect to mention 

 with any certainty. The size of the insect, the small head, robust and 

 coarsely haired thorax, stout and abbreviated abdomen, indicate a form 

 resembling that of Acrocera, and the tibiae appear to be destitute of 

 spurs ; but the legs are not very slender, and the neuration of the frag- 

 ment of the wing does not agree well with AVestwood's figure of A. 

 (jlohulns Panz. in Walker's Diptera Britannica. There are, however, 

 only a few longitudinal veins next the base, disconnected and faint, so 

 that they afford very slight indication of the real character of the wings, 

 and, the transverse veins being obliterated, nothing can be said of the 

 basal cells. Length of body 4.5"""; head O.G"""; height of same 1.3"""; 

 thorax and abdomen of about equal size. Fossil Canon. 



