158 THE BERMUDA ISLANDS. 



gained in studying this species, because of the great length of 

 its ovipositor and the greater proportions of all its organs, as 

 compared with its nearest relatives in the same section of 

 country. The black species which we have all along regarded 

 as Gryllus Pennsylvanicus Burm. lives almost within the same 

 territory, but it prefers the dark loamy soils farther inland, 

 and only ventures upon the open pale sand beaches when 

 hard pressed for food or moisture. 



Further, the G. luctuosus is very variable in color and pat- 

 tern of marking in the various young stages, as well as in the 

 fully adult. The G. Pennsylvanicus on the other hand is very 

 slightly variable in color, and has a much shorter ovipositor, but 

 it also has occasional individuals of both sexes fully winged. 



Now the specimens brought in from Bermuda display pre- 

 cisely the same differences of degree and kind of color and 

 structure that we observe belonging to those colonies inhabit- 

 ing the tidal region south and east of Baltimore. From Ber- 

 muda the long and short winged individuals are present in 

 both sexes, and the colors vary in both young and adults. 



LOCUSTIDJE. 



Orchelimum vulgare, Harris. 



A badly broken female specimen is the only representative 

 of this form in the collection. The length and form of the 

 ovipositor and the shape and markings of the head and pro- 

 notum definitely refer it to this species. 



DIPTERA. 

 TABANIDJE. 



Tabanus, sp. ? 



This is one of the smaller horse-flies, related to T. lineola, Fabr., 

 but in color it resembles the T. cincta, Fabr. The specimens are 

 too much altered to be accurately determined. 



Odontomyia, sp. ? 



Two specimens are in the collection. 



Sarcophaga carnaria, Linn. 



One specimen of the usual type is present in the collection. 



