344 MEMOIRS OF THE CARNEGIE MUSEUM 



the colleeting excursions were undertaken witli Pittsburgh as a base. However, on 

 three occasions the base was sliifted. Visits were twice made to the eastern part of 

 the state, where the writer spent several weeks in September of the years 1904 and 

 1905 in Philadelphia and its environs, and once to the eastern central part, where 

 several days were spent in Harrisburg in June, 1905. The latter visit was marred 

 by rainy weather. 



The work of collecting was done for tlie Carnegie Museum by the writer in con- 

 nection with his duties as Curator of Invertebrate Zoology, and all the necessary 

 expenses were paid by the Museum. In order to give an idea of the amount of 

 field-work done, a few statistics may be interesting. 



Altogether one hundred and thirty-eight days were spent in the field, counting 

 only those days on which actual collecting was done : four days in 1903 ; sixty in 

 1904; and seventy-four in 1905. A few additional records were obtained in 1906. 



The distances covered in travelling were as follows : 



Total. 

 By rail, in 1904 3238 miles. 



" " "1905 7579 " 10,817 miles 



By team, in 1904 13 miles. 



" " -'1905 26 " 38 miles. 



On foot, in 1903 3 miles. 



' 1904 173 " 



" " "1905 209 " 385 miles. 



Grand Total 11,240 miles. 



Collections were made at about one hundred and fifty-six diflerent localities, 

 most of them in the state of Pennsylvania. Of the sixty-seven counties of the state 

 thirty-nine were visited.' Besides, visits were made to a number of localities situ- 

 ated in neighboring states, namely : in Camden County, New Jersey ; in Allegheny 

 and (iarrett Counties, Maryland; in [Morgan, ^Mineral, Tucker, Preston, Monon- 

 galia, Pleasants, AVetzel, Marshall, Ohio, Brooke, and Hancock Counties, West Vir- 

 ginia ; and in Harrison, Carroll, and Stark Counties, Ohio. 



The material secured on tliese excursions Ijelongs to and has been dejjosited in 

 the collections of the Carnegie Museum, and comprises 303 entries in the Cata- 

 log, including 18fi9 specimens. But this does not represent the entire number of 

 specimens collected, since large sets, which have not been cataloged, have Iteen set 

 aside as material for exchange, studv, etc. 



'Material wassecnred, seen, or was previously known from fifteen adiHtional counties, so tliat only thirteen are 

 not e.xploreil, namely : Carbon, Juniata, Lackawanna, Lebanon, .MifHin, Monroe, Montour, Pike, Schuylkill, Snyder, 

 Susquehanna, Union, and Wyoming. All these belong to the central and northeastern section of the state, where only 

 one species of Cambaru.s {C. bnrlimi) is to be expected, with the exception of those localities which are in th.e immediate 

 vicinity of the main branches of the Susqnehanna River, where also C. Vnwmis may be present (.Tuuiatii, Montour, 

 Snyder, and Union Connties). 



