392 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.53. 



DIOCTRIA (7) PULYERIS, new species (AsUidae). 



Length, 10.7 mm.; wings, 8 mm. long; hind femora, 2.5 mm., nar- 

 row basally, regularly enlarging to a stout apex; hind tibiae about 

 2.5 mm. ; legs not bristly ; head and thorax dark ; abdomen long and 

 slender, light reddish; thorax little elevated in profile; antennae 

 poorly preserved, but third joint thick, much stouter than in modern 

 Dioctria; wings, hyaline with light brown veins, no trace of a stig- 

 matic spot. The venation is essentially as in Dioctria {^ floris- 

 santina Cockerell, and the insect appears to be certainly congeneric. 

 The general appearance and the spineless legs suggest a Leptid, and 

 the venation is close to that of the Leptid Ptiolina, though in other 

 respects the insect is very different. Compared with D. florissa7itina 

 the new species is larger, with a much broader (higher) second sub- 

 marginal cell and paler veins, but the two are very similar. The 

 base of the second posterior cell is not produced. The following 

 wing measurments are in microns: End of first vein to end of sec- 

 ond on margin, 1,280; end of first vein to vertical level of tip of 

 wing, 2,048; depth of marginal cell at end of first vein, 320; depth 

 of first submarginal cell at level of basal corner of second, 512; depth 

 of second submarginal cell near end, 608; length of praefurca, 880; 

 first submarginal on first basal, 832; first submarginal on first pos- 

 terior, 2,400; second marginal on first posterior, about 2,080; first 

 basal on discal, 736; first posterior on discal, 1,40&; second posterior 

 on discal, 176; third posterior on discal, about 336; second basal 

 on discal, 336; second basal on fourth posterior, 176; second basal on 

 fifth posterior, 384. The anal is closed not far from margin. Some 

 of the corresponding measurements of D. florissantina are: First 

 submarginal on first posterior, 1,632 ; first basal on discal, 672 ; first 

 posterior on discal, 960. 



Miocene shales of Florissant (George Wilson). 



n oloty pe.—Cdii. No. 63459, U.S.N.M. 



