212 [December 



that has not some such modification of that type of bullas which pre- 

 vails in Iclineumon, and none that has not at least two bullae, viz : 

 (or CD) and iJ * 



Although, as I believe, the bullae exist typically in every species of 

 Ichneitmon in the pattern peculiar to that genus, yet, as we might nat- 

 urally expect, we occasionally in certain species meet with certain spe- 

 cimens, where they are partially obsolete, or undergo some other slight 

 modification, sometimes in one wing only, sometimes in both wings of 

 the same specimen. In order to test this question, I have carefully 

 examined both front wings in 319 specimens belonging to the 70 spe- 

 cies of Ichneumon which I possess, making in all 638 wings. Of these 

 638 wings as many as 75, belonging to 28 different species, have the 

 bulla A obsolete; 28 wings, belonging to 15 different species, have the 

 bulla D obsolete; f in one wing only of the 638, belonging to a single 

 9 of semim'ger Cress, out of 3 $ which I possess, is the bulla C obso- 

 lete ; but in none whatever of the 638 are either the bulla B or the 

 bulla E obsolete. In 5 wings out of the 638, belonging to 3 different 

 species, where the areolet is subrhomboidal, including 1 S out of 28 

 % of Jiavizonatus Cress., the bullae A and B are confluent above. x\nd 

 only in 2 wings out of the 638, viz : in 2 S of morulus Say — a very 

 abnormal species with metathoracic thorns | — out of 3 S 2 9 , is there 

 a small additional or spurious bulla located on the side of the areolet that 

 adjoins the discoidal cell, but only on the inside of the areolet and not 

 extending on to the vein. In 11 out of 13 specimens of Trogus obsi- 

 (/ta?iato/-Brulle which I possess, this same additional spurious bulla or 

 rather semi-bulla makes its appearance. But neither in the three other 



*Say describes the "bullse" by that name in Anomalon attractus, An. {Odon- 

 tomerus) melUpes, Ophion brarhiator and Cryptus grallator ; and describes them as 

 "white spots" in Banchus cequatus and B. nervulus. Of course, if he had been 

 aware that these bullre are, properly speaking, a generic character common 

 to all the species of the same genus, he would not have given them as charac- 

 ters of particular species. Brulle neither names nor describes the bullse in any 

 of his dej^criptions of IchneumonidcE, though his Artist has figured them Plate 

 XLII, fig. 1. And Mr. Cresson tells me that " neither Fabricius nor Graven- 

 horst, so far as he can see, mentions the bullse or any other term for that cha- 

 racter." 



fin several small species with hyaline wings, which I have referred to this 

 category, the second recurrent vein is so nearly straight, that it is difficult to 

 sav, whether it is the bulla D that is obsolete or the bullfe C'and D that are 

 confluent. 



\U Hoplismenus Gt\. can be retained as distinct from Cryptus, vfhlch Brull6 

 denies, then this species should also be erected into a genus distinct from Ich- 

 ncumon. 



