THE CANADIAN ENTOMOLOGIST 33 



LEUCOPELMONUS CONFUSUS, NORTON— TENTHREDINID.^.* 



BY ALEX. D. MaCGILLIVRAY, UNIVERSITY OF ILLINOIS,, URBANA, ILL. 



Norton in his "Catalogue of the Described Tenth red inichr and Uroceridae 

 of North America," describes as a new species, Tenthredo confiisiis. This 

 species was based upon a male received from the Smithsonian Institution. The 

 only locality noted was the United States. The type of this species has been 

 reported as lost and, so far as I am aware, no one has identified this species since. 



In the Canadian Entomologist for 1893, Mr. W. Hague Harrington de- 

 scribed a peculiar tenthredinid, Tenthredopsis (?) annulicornis. It is not unusual 

 for species of Ichneumonidee to have the proximal and distal segments of the 

 antennae black or dusky and the intermediate segments white. This is the 

 first record of a species of Tenthredinidae with antennae coloured in this way. 

 The female of this species has the fifth and sixth segments white and the others 

 dusky. Such an arrangement of colour makes the female very easily recognized. 



Mr. S. A Rohwer described a similar species from North Carolina under 

 the name of Perinura tiirbata. The female of this species also has the fifth and 

 sixth segments of the antennae white. 



There is included in my report on the Tenthredinoidea in the report of the 

 Hymenoptera of Connecticut a new genus and species, Leucopelmonus annulatus, 

 the female of which has similarly coloured antennae. This species was based 

 on specimens collected in New England. It was hoped that a careful study of 

 all these species could be made before the description of L. annulatus was pub- 

 lished, but this was impossible. 



The description of Norton was based upon a male, but in the case of the 

 species described by Harrington, Rohwer, and MacGillivray, specimens of both 

 sexes were available for study. There is before me for comparison typical 

 specimens of both sexes of these three latter species. While there are slight 

 individual variations, I am unable to find any constant characters for separating 

 them. The males agree perfectly with Norton's description of the male of 

 confusus, and I believe that these four names all apply to a single species which 

 is very constant in its structural and colorational characters. 



Leucopelmonus MacG. 



1917. MacGillivray, Bui. Conn. Geol. Nat. Hist. Surv., 22, 83. 



Head broad between the compound eyes, nearly twice as broad as the eyes 

 are along at the antennal foveae; compound eyes with their mesal margins 

 nearly parallel or only slightly converging ventrad ; antennal plates not strongly 

 developed, but distinct; malar space one-half as long as the first antennal seg- 

 ment; clypeus deeply emarginate, labrum broadly rounded; lateral ocelli slightly 

 dorsad of a line connecting the dorsal corners of the compound eyes; antennae 

 with nine segments, the first distinctly longer than the second, segments of the 

 flagellum not thickened or clavate; legs with the metacoxae not reaching to the 

 caudal margin of the third abdominal segment, metafemora not reaching the 

 caudal end of the abdomen, and the claws deeply cleft; front wings with the 

 radial cross-vein, the free parts of R4 and R5, the radio-medial cross-vein, and 

 the free part of Sci distinct; M3+4 originating from the cell Rs and M2 from the 

 cell R4; 2nd A a short, transvense vein; hind wings with the free part of R4 and 



*Contributions from the Entomological Laboratories of the University of Illinois, No. 57. 

 February, 1919 



