L916-] NATURAL SCIENCES OF PHILADELPHIA. 247 



notuni. particularly in the male sex, is apparently more transverse 

 and less distinctly longitudinal in p. arboreus than in p. punctulatus, and 

 the caudal margin of the same area is more broadly obtuse-angulate. 

 The exact form of the male cerci shows so much variation in the 

 available males of punctulatus punctulatus, that we do not feel justified 

 in attempting to give the differences in this structure between the 

 series of the typical form and the very few male individuals of p. 

 arboreus. The form of the subgenital plate, however, is quite con- 

 stant as far as the material before us goes. 



The following measurements (in millimeters) show the regular 

 increase in size southward in typical punctulatus and the race arboreus: 



Length of 



Length of Length of Length of caudal 



.1/. p. punctulatus. body. pronotuni. tegmen. femur. 

 o* 



De Grassi Point, Ontario 18.5 4.6 16.4 11.3 



Bellasylva, Pennsylvania ... 21.5 5 18 12 



Blantyre, N. C ' 24.6 5.3 22 13.3 



Raleigh, N. C 24 5.5 17 13 



9 



De Grassi Point, Ont 29. 5 1M 5.6 18.8 11.9 



Bellasylva, Pa 27.6 5.5 19.3 12.8 



Stafford's Forge, New Jersey 29 6 20 14.4 



Virginia 6.3 21.3 14.8 



Raleigh, X. C 35.3 6.1 21.9 14.9 



M. p. arbon us. 

 o* 



Lake Drummond, Va 29.4 6.3 26.2 15.6 



Dallas, Texas 27.2 6.2 22.3 15 



9 



Lake Drummond, Va 27. 4 105 6.9 19.5 15.3 



Like Drummond. Va 36 8.9 30 19.3 



Southern Pines, N. C 38.7 8.5 26.6 18.5 



Walton County, Florida 35.5 8.2 26 18.4 



The distribution of typical punctulatus, in the east at least, seems 

 to be restricted to the Boreal, Transition and Upper Austral zones, 

 intergrading with p. arboreus, which is an Austroriparian form. 

 The Blantyre and Raleigh records are the most austral known to us 

 from the eastern State-. 



Melanoplus punctulatus arboreus Scudder. 



Virginia. 1913, (J. C. Bradley), 1 juv. 9 , [Heb- 



Lake Drummond, Dismal Swamp, X. ^d Cln.]. 



29, 1906, _4L S. Barber), 1 tf, 2 9, Florida. 



' . Walton County (taken from stomach 



(reorgia. of turkev killed in pine forest), 1 9, 



Vicinity of Stone Mountain, VIII, 3, [U. S. X. MJ. 



104 Abdomen greatly extended in this specimen. 



105 Abdomen greatly shrunken in this specimen. 



