82 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.63. 



mid tibiae with two bristles on the outer front side near the middle, 

 hind tibiae thinly ciliate. Wings hyaline, apical cell open, the third 

 vein bearing two or three bristles at its base. 



Length 7 mm. 



Described from one female specimen collected at Moscow, Idaho 

 (Aldrich). 



Type.— Mii]e, Cat. No. 14698, U.S.N.M. 



PHOROCERA XANTHURA, new species. 



Male. — Eyes not very densely hairy. Front 0.33 of head width; 

 the paraf rontals blackish above, yellow pollinose below ; paraf acials 

 also yellow pollinose; the frontal bristles extending to the arista; 

 facial ridges with rather weak bristles which do not ascend quite to 

 the level of the f rontals. Antennae black, the fourth joint four times 

 the second and rather wide through its whole length; arista thick- 

 ened on the basal third; bucca more than one-fourth the eye -height; 

 palj)i black ; proboscis small. Dorsum of thorax with the usual gray 

 pollen showing four black stripes when viewed from behind; four 

 dorsocentrals ; three sternopleurals ; the sternopleurae with only a 

 few bristles below near the median line. Abdomen rather curved 

 downward apically; the second and third segments gray pollinose 

 with changeable pattern; the fourth segment with dense and almost 

 uniform yellow pollen. Genital segments small, brownish-black; 

 the inner forceps divided, straight, slender, the outer forceps of the 

 same length, rather stout at base, slender at tip, gently curved. 

 Fifth sternite deeply cleft, the lobes bearing only a few hairs. Legs 

 black, middle tibia with only one smallish bristle on the front side: 

 hind tibia with a row of very small bristles on the outer side in- 

 terrupted by one larger at the middle. Wings hyaline: bend of 

 fourth vein decidedly oblique, not at all rectangular, the apical cell 

 narrowly open at a distance before the apex, equal to a little more 

 than one-half the length of the hind crossvein; third vein with two 

 bristles at base. 



Length 6 mm. 



One male, Nashville, Tennessee, reared from Papaipema nitela 

 Guenee (W. H. Larrimer). 



Type.— Male, Cat. No. 25724, U.S.N.M. 



PHOROCERA TENUISETA, new species. 



Female.— Front 0.31-0.34 (in three) of the head width. The head 

 when viewed from in front noticeably wider than high; f rontals 

 with light yellow pollen which becomes white on the paraf acials; 

 the frontal bristles extending almost to the tip of the second an- 

 tennal joint, only the uppermost one reclinate; several long erect 

 hairs adjacent to orbitals: bristles of the facial ridges becoming weak 

 above, and in two of the specimens ending a little lower than most 

 Phoroceras, at about the middle of the third antennal joint ; antennae 



