WALSH DESCRIPTIONS OF N. AM. HYMENOPTERA. I 13 



has the tip of abdominal joints 5-8 more or less black. I find no 

 traces of this character in my specimens. The habitat he gives 

 is Carolina. According to Mr. Cresson, there is a specimen in 

 the collection of the American Entomological Society "with the 

 abdomen half black," i. e. with the normal spots on 2-4 con- 

 fluent. 



Genus CYLLOCERIA, Schiodte. 



The very remarkable emargination at the tip of the 3d and base 

 of the 4th joint of the flagellum of % antenna, which has much 

 the appearance of an accidental mutilation propagated by inher- 

 itance, seems to identify this genus sufficiently when taken in 

 connection with several other characters in which the American 

 type agrees with the European one. Bridle, indeed, states only 

 that " the tip of the 6th and base of 7th joints are emarginate," 

 without specifying whether he refers to the antennae or to the ab- 

 domen ; but the etymology of the generic name proves that he 

 must refer to the antennas. The American type differs, however, 

 from the European type in the 1st joint of the antennas being la- 

 terally (not inferiorly) truncate in an angle of about 45 . More- 

 over, the 2d joint of the maxillary palpi is elongate-obtrigonate, 

 and 22 times as long as wide ; the 3d joint h longer than the 2d, 

 but a trifle narrower, straight, and basally a little constricted ; the 

 4th and 5th slender and each respectively a trifle shorter than the 

 preceding. Whereas Brulle says that the 2d joint is wider than 

 the others, and that the 3d is twice as wide as the 2d and curved ; 

 so that it is impossible to tell which, according to him, is the 

 wider, the 2d or the 3d. But in Ichneumonidce the structure of 

 the palpi appears to be rather of specific than of generic value. 

 His description of the labial palpi agrees exactly. In my species 

 the mandibles are toothed, the clypeus is very short and transverse 

 as in Xylonomus, etc., the head scarcely twice as wide as long 

 and much excavated behind so as to describe a circular arc of 

 about 6o°, and the parapsidal grooves are as deeply impressed as 

 in Xytonomus, etc. In the 2 the terminal joints of the abdomen 

 are extended and the 6th ventral not prolonged, or, as it is term- 

 ed, "the anus is slit." The bulla* are 4, A, C, D, and E ; A in- 

 distinct and placed on the forward end of the areolar cross-vein, 

 C well forwards on its vein, C and D quite widely separated, 

 and E pretty close to the angle of its vein. 



iii— 8 [May 24, 1S73.I 



