56 THE CANADIAN ENTOMOLOGIST. 



Arthemis, the yellow female Turnus alone is found. Along the southern 

 boundary the black one appears ; here and there a single individual, and 

 having once got a foothold the black form gradually gains the mastery, 

 and in the south alone rules. There are no yellow females of Turnus there. 



It seems to me not improbable that Arthemis, of all its group, is 

 nearest the parent species. Every character, from egg to imago, shows 

 that all these species are very closely related, and apparently not more 

 than one remove from a common form. Arthemis being so dominant, 

 occupying the north, whence most species are supposed to have come, it 

 may even be identical with that form. Having once given rise to a black 

 co-form, this last has gone southward and become modified in shape of 

 imago and color, and in the southwest is itself replaced by its own variety 

 Arizouensis. 



That two distinct species wherever they come in contact can cross 

 freely, and originate a permanent, intermediate and hybrid race, I do not 

 believe. And, in the present case, the so-called hybrid race is not inter- 

 mediate, but entirely on the side of one of the supposed parents, to wit, 

 Arthemis^ and a long way from the other, to wit, Ursula. Analogy 

 shows us that it is a case of dimorphism, not hybridism. 



TEN NEW SPECIES OF ORTHOPTERA FROM NEBRASKA- 

 NOTES ON HABITS, WING VARIATION, ETC. 



BY LAWRENCE BRUNER, LINCOLN, NEBRASKA. 

 ( Continued from page 40.) 



Xiphidiuvi modestum, n. sp. — Related to X. saltans Scudd. and X. 

 strictuvi Scudd., from both of which species it differs in its smaller size, 

 slenderer form and in colour. 



Vertex or cone of the head not quite so broad and shorter than in 

 saltans, its closest ally ; pronotum with the sides less bulging, and not 

 reaching as low as in that species. Tegmina very short, only about one- 

 third as long as the abdomen, with the shrillmg organ of the male 

 narrower and a little further lemoved from the base of the wing than in 

 its allies. Posterior femora quite slender, of moderate length. Tip of 

 male abdomen but slightly enlarged, the ccrci elongate, tapering, a little 

 curved outward and furnished with a rather long sub basal tooth. Ovi- 



