90 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 51. 



p. dejecta Scudder, from Green Eiver, Wyoming, and differs in de- 

 tails of the venation. It appears to be quite distinct from the other 

 species described by Scudder, and from the many Canadian forms 

 described by Handlirsch. 



H olotype.— C^t. No. 61455, U.S.X.M. 



PSILOCEPHALA SCUDDERI Cockerell (Therevidae). 



Plate 2, fig. 5. 

 A figure is given of a specimen collected by Mr. George N. Rohwer 

 at Station 14, in the Miocene shales at Florissant, Colorado. The 

 following description was made from this specimen: Length about 

 11.5 mm., of which 7.75 mm. is abdomen; black, the abdominal su- 

 tures broadly colorless; legs entirely dark; face not hairy; basal joint 

 of antennae with large bristles at end, as in modern Psilocephala; 

 wings very short, about 6.5 mm. long, dusky, the apical region paler. 

 The following wing measurements are in microns : Submarginal cell 

 on margin, 1,310; length of second submarginal cell, 2,240; first basal 

 cell on submarginal, 1,250; submarginal on first posterior, 1,210; first 

 posterior on discal cell, 1,184; first p)osterior on wing-margin, 592; 

 second posterior on discal, 208, and on wing-margin, 560 ; third pos- 

 terior on discal, 368 ; 

 width of anal at 

 broadest part, 560. 

 This specimen is in 

 United States Na- 

 tional Museum. Cat. 

 No. 61456. 



OXYCERA ROHWERI. 



new species (Stratio- 

 myidae). 



Fig. 1. — OxYCERA eohweei. a, Discal cell and adjacent y ,•- ■. ? i 



PARTS. 6, Second SDBMARGiNAL cell. c,ScnTELLAR spines. J-iengin prooaDiy 



about 8 mm.; black, 

 the abdomen extremely broad, about 4 mm. wide, without light mark- 

 ings, its dorsal surface with very fine and short rather close dark 

 hair; wings about 6.25 mm. long, width near base about 2.35 mm., 

 fuliginous, the stigmatic spot small. Cubital vein forked, the second 

 submarginal cell long; discal cell very long; veins from discal cell 

 reaching wing margin ; anal cell very broad, closed. Scutellar sDines 

 long, close together. 



The following measurements are in microns: Length of second 

 submarginal cell, 608 ; discal cell on first basal, 224, on second basal, 

 256, on first posterior, 752; width of anal cell about middle, 720; end 

 of anal cell to wing-margin, 336; second posterior cell on wing- 

 margin, 560; third posterior cell on wing-margin, 640; fourth pos- 



