REHN AND HEBARD 65 



a single adventitious spine on one limb and much more rarely 

 two spines on but a single limb. We have examined no specimen 

 with spines on both caudal femora. Curiously all individuals 

 noticed to have any spines at all are from localities west of the 

 Mississippi (Iowa, Missouri, Nebraska and Texas). 



Distribution. — In the eastern United States apparenth' re- 

 stricted to the general vicinity of the coast, generally in or near 

 salt marsh, and distributed from New Hampshire (Rye Beach) 

 south to southern Florida (Homestead); in the interior ranging 

 from extreme southern Ontario (five localities reported by 

 Walker), northern peninsula of Michigan (Menominee), south- 

 eastern Minnesota (see Lugger) and south-central Montana 

 (Billings) south to the Gulf Coast of Florida and Mississippi, to 

 at least south-central Texas (Gregory and Del Rio), west to at 

 least Billings, Montana, eastern Colorado (La Junta and Jules- 

 burg) and Albuquerque, New Mexico. The vertical range of 

 the species is easily the greatest in the genus, extending from 

 sea-level to approximately 8000 feet (Beulah, New Mexico). 

 From the eastern states we know of no correct record of the 

 occurrence of the species at a locality away from the general 

 vicinity of the coast. Allard has reported longipenne from 

 Thompson's Mills, Georgia, but the material, which we have seen 

 collected by him an 1 so labelled, is referable to 0. agile. 



Specimens Examined: 472; 235 d', 212 9, 13 juv. cf, 12 juv. 9. 



Rye Beach, New Hampshire, IX, 1 and 2, 1913, (H.; in salt marsh grass), 

 3 d^, 4 9. 



Vicinity of Boston, Massachusetts, (Scudder), 2 cT, [M. C. Z.]. 



Cape Cod, Massachusetts, (Scudder), 9 c?', 2 9, type and paratypes, [M. C. 

 Z.; U. S. N. M.]. 



Scituate, Massachusetts, VIII, 29, 1897, (F. H. Sprague), 2 9, [M. C. Z.]. 



Wesquage Beach, Rhode Island, IX, S to 10, 1913, (H ; in salt marsh grass), 

 1 d". 



Stony Creek, Connecticut, IX, 2, 1904, (H. L. Viereck), 1 9, [A. N. S. P.]. 



Saybrook, Connecticut, VII, 27, 1904, (H. L. Viereck), 1 d", [A. N. S. P.]. 



Lighthouse Point, New Haven, Connecticut, IX, 27, 1904, (B. H. Walden), 



1 9, [Hebard Chi.]. 



Spray Beach, New Jersey, IX, 6, 1906, (Bayard Long), 2 c?", [A. N. S. P.). 



Mullica River meadows near New Gretna, New Jersey, VIII, 24, 1914, (H.; 

 in short grass far out on flats and in bordering rush swamp), 19 c?', 20 9, 1 

 juv. cT, 1 juv. 9 . 



Chestnut Neck, New Jersey, VII, 16, 1911, (R. & H.; in salt marsh grass), 



2 c^,6 9. 



TRANS. AM. ENT. SOC, XLI. 



