344 MEMOIRS OF THE CARNEGIE MUSEUM 
the collecting excursions were undertaken with Pittsburgh as a base. However, on 
three oceasions the base was shifted. 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. he latter visit was marred 
by rainy weather. 
The work of collecting was done for the Carnegie Museum by the writer in con- 
nection with his duties as Curator of Invertebrate Zodlogy, 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. 
Byarall inl 904 aeeomeessosnsecscenseteeceeeceoescceesccece 3238 miles. 
Senta ecu ree NOOR ace. a aoc MRR) 10,817 miles. 
By team, in 1904 .. oo Ao 12 miles. 
pees! 1 OD irecachuaectcatecataninecn vansaceanetateneeares OY} = SC 38 miles. 
Onifoob pine O0SPerccecceccese ee ercoeee cone eee eaceeen ee 3 miles. 
porte teas SSA OA Malt SecuenctecSen oan saaentnesciacamececene seas 17. 
CU Sao dle KS ta hanna ners Suse Roe BR SASS once NOro ATC eM ESC ae 209‘ 385 miles. 
GrandiDotalyscso ences coh eaenase oheee coe aarencosneaees 11,240 miles. 
Collections were made at about one hundred and fifty-six different 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 Garrett Counties, Maryland; in Morgan, Mineral, Tucker, Preston, Monon- 
galia, Pleasants, Wetzel, Marshall, Ohio, Brooke, and Hancock Counties, West Vir- 
ginia; and in Harrison, Carroll, and Stark Counties, Ohio. 
The material secured on these excursions belongs to and has been deposited in 
the collections of the Carnegie Museum, and comprises 303 entries in the Cata- 
log, including 1869 specimens. But this does not represent the entire number of 
specimens collected, since large sets, which have not been cataloged, have been set 
aside as material for exchange, study, ete. 
‘Material was secured, seen, or was previously known from fifteen additional counties, so that only thirteen are 
not explored, namely : Carbon, Juniata, Lackawanna, Lebanon, Mifflin, 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 Cambarus (C. bartoni) is to be expected, with the exception of those localities which are in the immediate 
vicinity of the main branches of the Susquehanna Riyer, where also C. limosus may be present (Juniata, Montour, 
Snyder, and Union Counties), 
