210 ' [Decembi;:e 



and is invariably located immediately bebind tbis salient angle so as to 

 toucb its apex. U'ls large and obvious, and is invariably located about 

 midway between the areolet and the obtuse, re-entering angle of the 

 first recurrent nervure, which angle, like that of the second recurrent 

 nervure, often bears a short stump of a vein, as shown in the figure. 

 And F and G are minute and inconspicuous, and invariably located 

 on the hind end of the two hindmost cross-veins, so as to touch the 

 anal or postcostal vein. 



Although three of these five blister-like spots, viz: B, C and U, are 

 obvious, so far as I can find out, in every N. A. species o£ Ichneumon 

 that has blackish wings, the other two being generally smaller and not 

 so conspicuous, and although jNIr. Cresson, on my calling his atten- 

 tion to the subject, kindly informs me that he notices them in many 

 European species with blackish wings, yet they have been almost en- 

 tirely overlooked by authors. Say refers to them only in his descrip- 

 tion of I. malacus, whei-e he calls them " bullae," (blisters or bubbles,) 

 and in his description of /. morulus, where he calls them "white dots;" 

 Cresson refers to them only in his descriptions of I. Blakei and /. sce- 

 lestus ; and Brulle does not refer to them at all. As to the minute 

 spots, F and G, though they occur, not only thoughout the genus Ich- 

 neumon, but in every specimen of every species of every genus belong- 

 ing to Ichneumonidse, (and I might add Braconidee,} that I have 

 hitherto examined, yet I cannot find that any author has as yet taken 

 any notice whatever of them. 



But these five "bullfe" are not confined to those species of Ichneu- 

 mon that have blackish wings. I discover that, by holding the wing 

 up to the light, they may be detected, more or less plainly, in all the 

 species of Ichneumon, at least seventy in number, that are contained in 

 my collection, many of which have almost perfectly hyaline wings.* 



*My collection comprises viola Cress. 9 {=maurusCress.=Orpheus Cress.), Jlavi- 

 cornis Cress. % , malacus Say 9 > saucius Cress. J (^ater Cress.), cincticornis Cress. 

 % 9 , morulus Say % 9 » vittifrons Cress. % , scelestus Cress. 9 ,extrematis {-must) 

 Cress. % 9 > unifasciatorius Say % , otiosus Say % 9 > agnihis Cress. 9 ,pulcher Brulle 

 %, coeruleus Cress. 9 (=true 9 oi pulcher /), Jucimdus Brulle 9> Grotei Cress. %, 

 flavizonatus Cress. %, atrifrons Cress. 9> comptus Say %,27aratus Say (1836) %, 

 comes Cress. 'J, '^ ,demnctor Say ^ ,fuscifronsf Cress. ^ , pectoralls? Say % ,funes- 

 ius? Cress. 9> centrator Say 9» suturalis Say 9) seminiger Cress. 9 (=riciwM5 

 Cress.), annul ipes? Cress. 9 {=pusillus Cress.), grandis Brulle 'S 9 ( S ^ambiguus 

 Cress., ^ =regnatrix Cress.) and rujiventris Brulle % 9 (=«e«iicoca7teMS Cress. = 

 incertusQr&ss.) The remaining thirty-nine species are not described either by 

 Say, Brulle or Cresson, and are probably most of them new. As regards the 

 synonymies given in the above list, it is projoer to add here, that I do not find 



