ART. 20. ICHNEUMON-FLIES OF TRIBE PANISCINI CUSHMAN. 15 



the discoidal cell nearly as wide at the base as is the brachial at 

 apex. Less definitely associated with size are the form of the 

 areolet, which varies from broadly sessile to almost subpetiolate; 

 the position of the second recurrent, which may be from strongly 

 antefurcal to slightly postfiircal with respect to the second inter- 

 cubitus; and the position of the fracture of the nervellus. 

 The color variation is better discussed under the varieties. 



OPHELTES GLAUCOPTERUS, variety FLAVIPENNIS (Provancher). 



Campoplex Jlavipennis Provancher, Nat. Can., vol. 6, 1874, p. 143. 

 Opheltes glaucoptenis Provancher, Nat. Can., vol. 11, 1879, p. 145. 

 Opheltes glaucopterus, variety Jlavipennis Morley, Rev. Ichn., pt. 2, 1913, p. 134. 



Through the kindness of Prof. H. C. Severin, of the South Dakota 

 Agricultural College, who has sent me a fine series reared and col- 

 lected in the early nineties by Dr. J. M. Aldrich, I have been able 

 to make a much more satisfactory study of the variation than would 

 otherwise have been possible. Combined with the dozen specimens 

 in the National Collection, these show an almost complete gradation 

 in all of the variations of both structure and color to be found within 

 the variety. 



The color difference mentioned by Morley as distinguishing this 

 variety from typical glaucopterus does not hold, for many of the 

 specimens have the propodeum more or less red. In jlavipennis, 

 however, the fifth tergite and usually more or less of the fourth are 

 black, while in glaucopterus, according to Schmiedeknecht (Opusc. 

 Ichn.) the change in color takes place on or beyond the fifth. This 

 is true of the two European specimens of glaucopterus examined. 



This variet}'' varies in color from the phase described by Pro- 

 vancher, in which the thorax is black with onl^^ the scutellum and 

 notauli and margins of the mesoscutum red, the occipital and ocel- 

 lar black spots broadly confluent, and the coxae largely black to 

 those in which the pronotum, mesoscutum, scutellum, propodeum 

 dorsally, the upper part of mesopleura and metapleura, the vertex 

 behind the ocelli, and the coxae, are entirely or largely red. The 

 phase with the upper part of the mesopleurum red is represented 

 by only a single specimen from South Dakota. It differs hardly at 

 all in color from the new variety harheri. 



The phase with largely black mesoscutum is also rather excep- 

 tional, the usual color of this region being red with the prescutum 

 black anteriorly. 



Occasionally the fifth tergite is red in the anterior lateral angles. 



In size this variety varies from 17 to 23 mm. 



Of the 34 specimens examined only one is a male. The scarcity 

 of the males in Europe has been noted by Morley, who states that 

 out of about 40 specimens in the British Museum only two were 

 males. 



20183— 25— Proc.N.M.vol.64- 31 



