164 PROCEEDINGS OF THE ACADEMY OF [April, 



Florida.** Texas. 



Pablo Beach, VIII, 12, 1905, (R. &H.), Galveston, VII, 19-21, 1912, (H.), 



I cf. 11 <?, 59. 



Cedar Keys, VIII, 15, 1905, (R. & H.), Virginia Point, VII, 21, 1912, (H.), 



II cf, 12 9. 8 c?, 12 9, 1 juv. 9. 



Corpus Christi, VII, 29, 1912, (H.), 

 29. 



The study of the present series of this and the following species, 

 as well as material of olivacea from New England and New Jersey- 

 brings out three points of interest. First, that olivacea increases 

 in size southward, the Tybee Island and Cedar Keys specimens being 

 appreciably larger than New England and New Jersey individuals. 

 Second, the range of this species covers the coastal marshes and 

 portions of the beaches from southern New England (Norwich, Con- 

 necticut) south to north Florida (Pablo 'Beach), also along the Gulf 

 coast from Cedar Keys, Florida, to Texas, as far south as Corpus 

 Christi, the two portions of the range being completely separated. 

 Third, that in similar environment in south-central and southern 

 Florida and southern Texas, north to Corpus Christi, olivacea is 

 replaced by an allied species, which does not intergrade with the more 

 northern form and is found associated with it at Corpus Christi. 



A critical examination of all of our material from fifteen localities 



extending from Connecticut to Texas shows a regular size increase 



in both sexes as one proceeds -southward to northern Florida, the 



size increase being accompanied by a broadening and blunting of the 



fastigium, specimens from Greenwich, Connecticut, and Cedar Keys, 



Florida, being quite different in the latter feature. Considering the 



Texan material, it is seen that the beach specimens (Galveston and 



Corpus Christi) are somewhat smaller than individuals taken in 



the salt marsh of the bays (Virginia Point), the series from the 



latter place averaging as large as the Cedar Keys specimens taken 



in the same environment. Measurements (in millimeters) of 



average individuals and pairs from a number of localities are as 



follows: 



Greenwich, Conn. Atlantic City, Franklin City, 

 (Paratypes). N. J. Va. 



cf 9 c? 9 9 



Lengthofbody 17. 21.5 17.8 24.3 26 5 



Length of pronotum 3.2 3.9 3.7 4.3 5. 



Length of tegmen 14.6 16.8 15. 19.8 21.4 



45 These specimens have been recorded by the authors (Proc. Acad. Nat. Sci. 

 Phila., 1907, p. 287, (1907)) as O. pelidna? These individuals are extremely 

 large olivacea, differing also, as here shown, from northern specimens of the 

 species in having the fastigium somewhat aberrant. 



