278 PROCEEDINGS OF THE ACADEMY OF [April, 



synonymy. Previously the following names have been found to 

 be synonyms of borealis: americana Harris, 1835; brevipennis Ser- 

 ville, 1839; longipennis Scudder, 1862, and Columbia Scudder, 1869. 



In the present species some variation is shown in the shape of the 

 ocelli and in the tegminal venation. 



Material from Florida and southern Georgia averages somewhat 

 smaller than material from more northern points; the smallest adult 

 specimen of the species we have ever seen is that from Billy's Island, 

 Georgia, the measurements of which are : length of body 20.4, of pro- 

 notum 7.2, of tegmen 6.4, of caudal femur 6, and greatest width of 

 pronotum 5.7 mm. 



Females of the species have been taken much more frequently 

 than males and the brachypterous condition is more frequently 

 found in both sexes in the region at present under consideration. 



Scapteriscus vicinus Scudder. PI. XIV, figs. 4, 5, 0, 7. 



1869. Scapteriscus agassizii Scudder, Mem. Peabody Acad. Sci., I, p. 13. 

 [Switzerland (introduced from Central America?).] 



Georgia. Brunswick, II, 5, 1903, (S. W. Good- 



Waycross, X, 20, 1914, (W. Tatum, year), 3 cf, 1 9,1 juv [IT. S. N. M. 



Jr.), 1 juv., [U. S. N. M.l. and Hebard Cln ]; IV 18 1912, 



Hebardville, V, 15, 1915, (H.; in sandy [W. V. Reed), 1 <?, 4 9, [U. S. 



soil in garden, associated with f- M.J; XI, 1907, 1 d\ [Ga. State 



S. acletus, but very scarce), 2 c?, 2 9. ^*'-, , T1 a vttt qi 1ft n 



St. Simon's Island, IV, 22 to IX, 8, Cumberland Island, VIII, 31, 1911, 



1909 to 1911, (J. C. Bradley), 3 tf, (H.; under log on strand) 1 juv 



4 9,4 juv.; (W. V. Reed), 9^,39, ^ hlt * °, ak > *&> a 1 ?£*i& S " Barn " 



1 juv., [Hebard Cln.]. well )> 1 <?> 1 U - & - N - M -l 

 St. Simon's, St. Simon's Island, III, 18, 

 1912, (W. V. Reed), 6 9 , [U.S. N. M.J. 



After careful consideration of very large series, representing every 

 species of the present genus, we are satisfied that the species found 

 abundantly in the southeastern United States, the West Indies 

 and portions of South America, and which has beeli frequently 

 recorded as S. didactylus, represents instead vicinus of Scudder. This 

 species is very closely related to didactylus of Latreille (described 

 from Surinam and found elsewhere in South America and northward 

 to Costa Rica), but is somewhat heavier, with the width of the 

 pronotum distinctly greater in proportion to its length and with 

 the basal width between the tibial dactyls averaging somewhat less. 

 The species is, however, not nearly as distinct as Scudder believed, 

 for the characters of the but little dissimilar ocelli, slightly different 

 terminal tarsal joints of the caudal tibiae and other differences which 

 he gives in the original description are practically valueless. 



The species, agassizii, described by that author on the following 



