SCUDDER ON FOSSIL INSECTS. 753 



broad in the middle as the thorax. Leugth of thorax 1.4""" ; breadth 

 of same 1.25™°'; length of abdomen 4,75™™; breadth of same 1.15"""; 

 length of wings 7™™. Fossil Canon. 



Family Mycetopiiilid.13. 



Mycetophila occultata. — A single poorly preserved specimen and its 

 reverse present an upper view of the insect, with the wings folded over 

 the back, the legs crowded together, and the antennae lying beside the 

 body. The antennte are about as long as the head and thorax, the 

 joints scarcely longer than broad, nearly cylindrical, scarcely at all mo- 

 niliform. The legs are comparatively slender, hairy, and unarmed, not 

 very long. The character of the venation shows the insect to belong to 

 the MycetojjMlidw, but what genus is represented is somewhat obscure 

 from doubt about the exact location of some of the veins ; neither 

 the auxiliary vein nor any of the basal veins above it can be seen, nor 

 can the axillary be traced ; judging from the other veins, it is probably 

 allied to Mycetojihila, although, in the j^ossible presence of a second 

 cross-vein uniting the cubital vein with the extremity of the radial, it 

 should be referred to a distinct genus, probably allied to Emplieria and 

 Tetragoneura. The presence of such a vein being doubtful, we have pre- 

 ferred to x>oint out its affinity to 31yceiop1iila. The radial vein ends in 

 the middle of the outer two-thirds of the costa, and at its tip a distinct 

 stigma, nearly three times as long as broad, occupies the space between 

 the radial and costal veins. The tip of the wing is broken on one spe- 

 cimen and obscured on the other, so that the length of the costal vein 

 cannot be determined, although it appears to extend slightly beyond 

 the tip of the cubital vein ; the cubital is connected by the cross-vein 

 to the radial but a short distance from its origin, and bends but little 

 upward from the medial vein to reach it; the middle discal vein, on the 

 contrary, bends downward considerably, and forks at a distance from 

 the base, less than half-way from the median cross-vein to the tip of the 

 radial vein, and an unusually broad space is left between its upper 

 branch and the cubital vein, while the fork of the hind vein is nearer 

 the base than the separation of the cubital from the medial vein. Length 

 of bodyS.o"'"'; antennte 1.1'""'; wings 3.5"""; tibire (of fore legs?) 0.75'""'; 

 tarsi (of same legs) 0.4""". Chagrin Yalley. 



Saclcenia, no v. gen. 



Body shaped much as in BoJetina. Ant^nune longer than the thorax, 

 one-fourth slenderer at the apex than near the base, gently' curved, 

 2+14-joiuted. Legs very long and slender; femora and tibiie of about 

 equal length ; tarsi a little longer than the tibire; the hind tibice and tarsi 

 together a little longer than the abdomen ; the tibiiv with one or two 

 apical spurs beneath and spiued throughout. Wings rather broad-ovate ; 

 the smaller veins at the extreme base obliterated in the specimen ex- 



