NO. 2181, NEW TERTIARY INSECTS— COCKERELL. 379 



head, so important in this group, being wholly obscure. At the 

 same time, it is a remarkable insect, and it seems impossible to 

 refer it with any assurance to a living genus. 



Type of the genus. — Urortalis caudatus, new species. 



UBORTALIS CAUDATUS, new species. 



PlateSl, figs. 9, 10. 



Female.— Body apparently black; thorax about 4 mm. long; abdo- 

 men, with the long slender ovipositor, about 7.5 mm. Wings about 

 4.4 mm. long, hyaline, with broad but extremely faint clouding along 

 the veins. Tlie following measurements are in microns: End of aux- 

 iliary vein to base of wing, about 1,360; end of auxiliary vein to end of 

 fii'st, about 720; end of first to vertical level of tip of wing, 2,480; first 

 basal cell on submarginal, 1,470; first basal on first posterior, 176; 

 width of first posterior near middle, 448, and at apex, 528; discal on 

 first posterior, 960 ; discal on second posterior, 576. 



Florissant, in the Miocene shales. 



Type.—Cait. No. 62539, U.S.N.M. 



MELIERIA ATA VINA, new species (Ortalidldac). 



Robust, dark brown, about 8 mm. long, wings a little over 6 nam. 

 The thoracic bristles can not be made out, but the characteristic long 

 bristles, curved backward, on the top of the head, are plainly visible. 

 Wing pattern very distinct, essentially as in M. obscuricornis Loew, 

 except that the apical patch is formed as in M. ochricomis Loew, and 

 there are two bands on the basal part of the wing, one broad, the other 

 (more basal) small. The broader of these bands is well represented 

 in M. similis, but does not extend right across the wing as in the fossil. 

 First posterior cell contracted apically, though widely open; anterior 

 crossvein far toward end of discal cell (as in Richardm) ; anal cell with 

 the end transverse and bulging (much as in Coelometopia), and a con- 

 siderable distance basad of end of second basal. The following 

 measurements are in microns : End of second vein to end of third, in a 

 straight line, 1,120; length of anterior cross- vein, 480; length of upper 

 side of discal cell, 1,872; base of discal cell to end of anal, 400; discal 

 on first posterior, 480; apical side of discal ceU, 800. End of prae- 

 furca very slightly basad of level of apex of anal cell. 



Florissant, in the Miocene shales. Although this is a prettily 

 marked fossil, the structural characters are hard to discern. The 

 shortness of the anal cell as compared with the second basal, as well 

 as its form, might indicate a genus distinct from Mdieria, but the 

 general resemblance to Melieria is so striking that the generic 

 reference seems almost obhgatory. 



T^/pe.— Cat. No. 62540, U.S.N.M. 



