270 AVILIJAM J. FOX. 



5. Wings fuscous ; apical segment reddisb ; scape nude 6. 



Wings subhyaline or suhfuscous, crossed by a broad, wbitish yellow fascia 



medially; scape beneath with long, white, matted pubescence; seg- 

 ments 3 and following black barbata. n. sp 



6. Punctures of first and second dorsal segments tolerably even and strong, the 



first segment broader than long; middle segment above without a 

 smooth, median channel, or, if j)resent, it is irvegular and poorly 



developed proiiiethea Blake. 



Punctures of the first and second dorsal segments coarse and widely separated, 

 the first segment longer than broad ; middle segment above with a 

 distinct, smooth, median channel floriflensis Blake. 



7. Pubescence grayish ; ocelli large (wings varying from fuscous to suhfuscous). 



Sayi Blake. 

 Pubescence reddish yellow throughout; wings fuscous rilfa Lep. 



FEMALES. 



Space between the eyes on an imaginary line di-awn across the middle of front is 

 about equal to twice the length of scape, or very little less ; legs and 

 abdomen varying from black to red ; segment 2 usually with two 

 silvery spots anteriorly, a silvery margin at apex of all segments. 



dubitata Smith. 



Space between eyes by no means as great as twice the length of scape ; legs 

 black; abdomen red, with first and third segments entirely, apex of 

 second, and fourth ventral entirely, black; second segment with a 

 silvery margin, which, dorsally, extends forward medially for one- 

 quarter of the length of segment eiiterpe Blake. 



161. IVIutilla hexagona Say. 



Mutilla hexogona Say, Bost. Jouru. Nat. Hist., i. p. 295, % ; LeConte Ed. 



Say's Entom.. ii, p. 738, 1859. 

 Mutilla hexagona, other authors. 

 Mnfilla briaxus Blake, Tr. Am. Ent. Soc, iii, p. 227, % , 1871. 



I have seen specimens of this species from most parts of the 

 United States, excepting the extreme western and southwestern 

 regions. It is also found in Canada and British Columbia. 31. 

 dubitata is prol)ably the female sex. 



M. bria.tus does not even represent a variety of this species. 



M vigilans Say, referred by some authors as a variety of hexa- 

 gona, evidently belongs near M. fenestrata, as far as can be ascer- 

 tained from the meagre description by Say. At any rate, by the 

 truncated marginal cell it is distinct from hexagona, and, moreover, 

 the abdomen is said to be differently colored, agreeing in many 

 respects with the forms allied to fenestrata. 



162. Mutilla dubitata Sm. 



Mutilla dubitata Smith, Cat. Hym. Brit. Mus., iii, p. 60. 1855, 9' ^^^^ ^'^ 



other authors. 

 3Iutilla ornativentris Cresson, Proc. Ent. Soc. Phila., iv, p. 438, 1865. 9 < ^^^ 



of other authors. 



