REVISION OF THE GENUS EXETASTES CUSHMAN 267 



nearly as long as basal width of mandible; diameter of an ocellus not 

 or barely as long as ocellocular line; antenna slightly shorter, with 

 45 joints or less, subapical joints as thick as long; pleural carinae 

 more or less distinct throughout; hind femur not or barely five times 

 as long as thick. 



Head, thorax, and legs colored as in fiavus except that the black 

 markings are usually less extensive, some even missing; tergites 1-3 

 immaculate yellow except for traces of the black on first; tergites 4-6 

 pale ferruginous at base. 



Type locality. — Buffalo, S. Dak. 



Ty^g.— U.S.N.M. no. 51801. 



Paratype. — Colorado Agricultural College. 



Remarks. — Three females, two from the type locahty July 31, 1924, 

 and one from Alamosa, Colo., August 11, 1934. The Colorado speci- 

 men very closely approximates j^ayws in the extent of black on head, 

 thorax, and legs. 



11. EXETASTES PROPINQUUS, new species 



Plate 16, Figube 8; Plate 17, Figure 27; Plate IS, Figures 48, 57; Plate 20, 

 Figures 92, 98; Plate 21, Figure 107 



Exetastes scutellaris Howard (not Cresson), Insect book, pi. 9, fig. 17, 1903; female. 

 Exetastes propinquus Cresson (MS. name), Viereck in Smith, Insects of New 

 Jersey, p. 618, 1910. 



The specimen illustrated as scutellaris in Howard's "Insect Book" 

 and the specimens on wdiich Viereck based liis New Jersey records form 

 a part of the type series, also a specimen labeled "propinqvus Cress. 

 MS." in Viereck's hand. 



This is the first of a distinct group of six species characterized by 

 the unusually thick head with very sliallowly convex eyes and strongly 

 convex temples, stout legs with the claws in female strongly pectinate, 

 and very broad abdomen. 



The first two species of this group differ from the others by the more 

 distinctly divided clypeus, the apical portion being abruptly impressed 

 and the basal portion ridgelike, by the evenly infumate wings in both 

 sexes, and by the shorter, straight ovipositor. 



Female. — Length 11 mm, antennae 10 mm. 



Head barely twice as broad as thick, densely finely punctate and 

 mat anteriorly, more sparsely punctate and shining posteriorly; 

 occiput shallowly concave; temple very strongly convex but not 

 reaching outside tangent of eyes; frons w^eakly concave medially; face 

 convex with a more or less well defined median elevation and somewhat 

 impressed above on each side; clypeus somewhat narrower than face, 

 a little more than half as long as broad with basal portion elevated 

 and apical portion impressed, strongly rounded at apex and with a 

 more or less distinct median longitudinal groove, sometimes weakly 



