294 PROCEEDINGS OF THE NATIONAL MUSEUM vol.84 



Exetastes fasciipennis Dalla Torre, Catalogus liymenopterorum . . ., vol. 3, pt. 



1, p. 71, 1901; female. 

 Exetastes cressonii Dalla Torre, Catalogus hymenopterorum . . ., vol. 3, pt. 1, 



p. 70, 1901; male (new name for flavitarsis Cresson). 



In studying this species I have examined the entire type series of 

 both of Cresson's names including a paratype of each in the United 

 States National Aluseum, also one other female from Colorado in the 

 collection of the University of Kansas. 



Female. — From angustoralis it differs principally in the malar space 

 being distinctly shorter than basal width of mandible, the cheeks 

 being therefore shorter in front view and with their extended angle 

 somewhat less sharply acute; junction of occipital and hj^postomal 

 carinae much less than basal width of mandible from the latter; 

 antenna slightly more slender, the joints immediately beyond middle 

 fully as long as tliick; apical half or more of stigma blackish. 



Male. — Differs from female in much the same way as the male of 

 angustoralis differs from its female. All the known males of the 

 present species have the head and thorax black with j^ellow markings, 

 the face, clypeus, mandibles, malar space, lower cheeks, frontal 

 orbits below, superior orbits, anterior margin of pronotum (sometimes), 

 a mark on each side of mesoscutum anteriorly and scutellum largely 

 yellow. Legs colored as in male oi angustoralis except that hind femur 

 is largely ferruginous. 



Type locality. — Colorado. 



Type. — Oi Jascipennis no. 1617, oi fiavitarsis no. 1618, Acad. Nat. 

 Sci. Philadelphia. 



Paratype. — Of jascipenrds, U.S.N.M. no. 51257; of Jlavitarsus, 

 U.S.N.M. no. 44733. 



39. EXETASTES RUFICOXALIS, new species 



Plate 17, Figures 17, 25; Plate 18, FiCxURe 54; Plate 20, Figures 90, 102; 



Plate 21, Figure 114 



A small species distinct from all the other North American species 

 with black head and thorax and ferruginous abdomen in its bright 

 ferruginous coxae. Structurally also it stands alone in the combina- 

 tion of characters employed in the key. 



Female. — Length 9 mm, antennae 7 mm. 



Head little broader than thorax and httle more than twice as broad 

 as thick medially; occiput shallowly concave; temples moderately 

 convex and sharply sloping; frons broadly concave and densely, finely 

 punctate; face densel}'-, finel}^ punctate, barely twice as broad as long, 

 strongly elevated mediall}^ and slightly concave laterally; clypeus 

 much narrower than face, two-thirds as long as broad, strongly convex 

 basally, strongly rounded apically and more or less emargiuate medially ; 

 cheeks in front view slightly convex, their extended angle nearly a 



