274 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 84 



17. EXETASTES BIFENESTRATUS, new name 



Plate 16, Figuke 11; Plate 17, Figure 32; Plate 18, Figure 61; Plate 19, 

 Figure 76; Plate 20, Figures 84, 94 



Ichneumon bifasciatus Say, Contr. Maclurian Lye. Arts and Sci., vol. 1, p. 73, 



1828; in LeCoiite, The complete writings of Thomas Say on the entomology 



of North America, vol. 1, p. 377, 1859; female (preoccupied by bifasciatus 



Fourcroy) . 

 (Cryptus) bifasciatus Say, Boston Journ. Nat. Hist., vol. 1, p. 234, 1835; in 



LeConte, The complete writings of Thomas Say on the entomology of North 



America, vol. 2, p. 691, 1859. 

 Cryptusl bifasciatus (Say) Cresson, Trans. Amer. Ent. Soc, vol. 6, p. 209, 1877; 



Synopsis of families and genera of Hymenoptera of America north of Me.xico, 



p. 183, 1887. 

 Exetastes bifasciatus (Say) Cushman and Gahan, Proc. Ent. Soc. Washington, 



vol. 23, p. 163, 1921. 



The preoccupation in Ichneumon of bifasciatus makes necessary a 

 new name for Say's species. 



This and obscurus Cresson form a group characterized by the very 

 dense fine punctation and vestiture of the head and thorax, thin head, 

 deeply separated and basally strongly convex clypeus, very short 

 antennae especially in the female, and moderately long recurved 

 ovipositor. 



Female. — Length 11 mm, antennae 8 mm. 



Head medially less than half as thick as broad; temples weakly 

 convex and strongly receding; occiput rather broad and moderately 

 concave; frons broadly and rather deeply concave; face nearly flat 

 and with a small prominent median rounded elevation, less than half 

 as long as broad; clypeus deeply separated, half as long as broad, apex 

 strongly rounded and narrowly subtruncate or emarginate medially, 

 basal portion short, convex, apical portion slightly concave; cheeks 

 in front view straight, their extended angle somewhat acute; malar 

 space about three-fourths basal width of mandible; mouth barely 

 broader than face; mandible about twice as long as broad at base and 

 strongly narrowing toward apex; junction of occipital and hypostomal 

 carinae three-fourths the basal width of mandible from the latter; eyes 

 strongly convex, barely as long as width of face, parallel; postocellar 

 and ocellocular lines equal and less than twice the diameter of a lateral 

 ocellus; ocelH distinctly before posterior tangent of eyes; antenna 

 rather slender, weakly tapering, with 44-46 joints, basal joint of 

 flagellum much less than twice as long as second joint, middle joints 

 longer than thick, subapical joints very short. 



Thorax stout; notauli absent; scutellum subtriangular, strongly 

 convex, less densely punctate than scutum ; propodeum strongly con- 

 vex, medially and posteriorly rugulose, with irregular apical carina 

 most prominent medially and fading out laterally, a longitudinal 

 impression before the carina, pleural carinae more or less distinct 



