REVISION OF THE GENUS EXETASTES — CUSHMA.N 285 



Abdomen black; legs beyond trochanters entirely ferruginous; 

 wings more deeply infiimate, stigma black, 



Male. — Malar space slightly shorter than basal width of mandible; 

 ocelli larger; antennae 42-jointed; wings hyaline, stigma brown. 



Tyjpe locality. — Silverton, Colo. 



T?/pe.— U.S.N. M. no. 51811. 



Eemarks. — One female and two males taken at 12,000 feet, July 

 8-31, 1903, and one male, Mount Cheam, British Columbia, August 

 10, 1903. 



28. EXETASTES DILUTIPES. new species 



Plate 16, Figure 14; Plate 17, Figures 20, 39; Plate 20, Figures 82, 97; 



Plate 21, Figure 106 



Female. — Length 12 mm, antenna 9 mm. 



Very similar to alticola, but with malar space three-fourths basal 

 width of mandible; propodeum reticulate-nigulose with apical and 

 pleural carinae distinct; basal two joints of hind tarsus fuscous; 

 abdomen more slender. Antennae shorter than in matricus, tapering 

 but not attenuate apically, 45- to 48-jointed. 



Male. — Malar space tvv'o-thirds basal width of mandible; ocelli 

 slightly larger; hind tibia at apex, especialh^ on inner side, and third 

 joint of hind tarsus fuscous. 



Type locality. — Banff, Alberta. 



T?/pe.— U.S.N.M. no. 51812. 



Allotype. — Cornell University. 



Paratype. — California Academy of Sciences. 



Remarks. — Five females, includmg the holotype, all taken at the 

 type locality, July 10 to August 10, 1925, by Owen Bryant; and two 

 males, one (allotype) from Maligne Lake, Alberta, July 1-3, 1915, 

 and one from Yellowstone National Park, June 19, 1930, E. Van 

 Dyke. 



29. EXETASTES PURPUREUS. new species 



Except for its bluish or purplish luster and darker wings this species 

 is, in general appearance, almost identical with matricus, but the 

 cheeks are not excavated and the hypostomal carina is of normal 

 height. It difi'ers also from the above description of matricus as 

 follows: 



Female. — Malar space slightly shorter; junction of occipital and 

 hypostomal carinae not more than basal width of mandible from base 

 of latter; ocelli somewhat larger; antenna not quite so long, 52-jointed 

 in type; scutellar carinae shorter; propodeum very finely rugulose 

 above and sparsely pimctate especially at base, posterior face retic- 

 ulate rugulose; abdomen slightly stouter, first tergite barely more 

 than twice as long as broad and second barely longer than broad at 

 base. 



