32 THE CANADIAN ENTOMOLOGIST. 



Ridgeway, I would suppose from the multitudes of them I saw there last 

 summer. I found them amongst some walnut trees which were growing 

 by the lake shore, on the line where the barren sand of the beach joined 

 the vegetation of the field, and when the lower branches or grass was dis- 

 turbed, they would rise in clouds. I have now in my collection io8 named 

 species; of these 58 have printed labels, leaving 25 labels yet unoccupied 

 by me, and giving me 50 names new to the Canadian list, and I have 76 

 single specimens besides yet undetermined. 



TENTHREDO (?) DELTA, PROV. 



BY W. HAGUE HARRINGTON, OTTAWA. 



Among the Tenthredinidae captured by me during the past season was 

 a good series of Tenthredo delta Prov, consisting of 12 females and 26 

 males. In pinning them I was frequently struck by the evident irregu- 

 larity of the venation of the wings, and on a more careful examination of 

 the specimens I find these irregularities to be both numerous and remarl 

 able. No other species represented in my cabinet show any such 

 divergencies from the typical form, except in rare instances. Provancher 

 describes the female (page 210, "Petite Faune Entomologique du Canada") 

 as having two discoidal cells in under wings, and Cresson (" Trans. Am. 

 Ent. Soc," vol. viii., page 44) as having one or two middle cells. One 

 middle cell appears to be the rule, and any deviation therefrom to be an 

 exception. Of my 12 specimens, 10 have one middle cell each, one has 

 two middle cells, and the other noiie. The males are more uniform 

 apparently in their venation, as none of my 26 specimens have middle 

 cells in the under wings, thus agreeing with the description given by 

 Cresson (loc. cit). Apart from the varying number of middle cells, the 

 under wing of the females have the cells varying much in shape, especially 

 the middle one, which ranges from a small triangular form to a large four- 

 sided (square or irregular) one. There are also occasionally small 

 additional cells on the posterior margin. 



The most interesting variations are, however, to be observed in the 

 anterior wings, and in this respect both sexes are nearly on a par ; a female 

 with three marginal cells is offset by a ^ with but one. The former has 

 both wings symmetrical as regards the additional marginal cell, and in 



