There is no described species which varies so much in length 

 of tegmina as ours does. In Redtenbacher's Monograph of the 

 Conocephahdae. the long-winged species of Xiphidium are sep- 

 arated specifically from the short-winged species. It seems prob- 

 able that m'any of the species described as short-winged, may 

 be but short-winged forms of the long-winged species, or vice 

 versa. 



In the United States five species of Xiphidium have been ob- 

 served to 'have dimorphism in the wings. 



X. ensiferum Scudder, Usually short-winged; "long-winged 

 forms are found occasionally"" 



X. nigroplcurum Bruner, "Tegmina are usually abbreviated." 

 "An occasional specimen is to be found in which the 

 wings are fully developed." ° 



X. strictnm Scudder, "Dimorphic, the long-winged forms, 

 however, being very scarce."** 



X. attciiuatum Scudder, Dimorphic, but only short-winged 

 forms mentioned for Minnesota." Both forms in Indi- 

 ana, about equally abundant in the northern part, only 

 the short-winged form in the southern part of State.** 



X. saltans Scudder, Usually short-wimged. "A long-winged 

 pair August 9, 1903."*** 



I have found no mention of intermediate forms in connection 

 with the dimorphism of these species. 



Blatchley f says of the Genus Xiphidium, "Variations in length 

 of wings seem to be abrupt with no intervening forms. There 

 are long-winged land short-wing-ed forms of the same species, 

 but none with the wings of medium length. Four of our eight 

 species are thus dimorphic as regards the length of the wings, 

 the short-winged individuals, as far as my observation goes, far 

 outnumbering those with the wings fully developed." 



From my table of measurements it will 'be seen that there is 

 a small proportion of individuals of X. varipcnnc which have 

 wings of medium lengths. I am of the opinion that interme- 

 diate forms may yet be found in other species; and further, 

 that more of the species may be found to be dimorphic as re- 

 gards wings. 



Our species was referred to X. fnsciim Fab. by Brunner, "Or- 

 thoptera of the Sandwich Islands," P. Z. S., London, p. 894, 

 1895. The same name is used by Perkins, Fauna Hawaiiensis, 



o Lugger, Bull. 55, Minn. Ag. Exp. Station, pp. .331, 2, 3, 1897. 

 *tr Blatchley, 27th An. Rep. Dep. Geol. and Nat. Resources, pp. 379, .381, 1902. 

 *** \\alker, Can. Ent. XXXVI, p. 340, 1904. 



t Orthoptera of Indiana, 27th An. Rep. Dep. of Geol. and Nat. Resources, p. 371, 1902. 



