522 MEMOIRS OF THE CAKXEGIR MUSEUM 



Fig. 5. Burrow of CKinlxtnix iJlcMjenes Giranl. Located in stiff blue clav,iii a ditch on a road- 

 side, IVine-iMiie Kun, Pittshnrgh, Allegheny County. Opened hy the writer, Nov. 

 o, lfM)4. The season had been very dry, and not much water was in the hole. 

 Pebbles were lying on the bottom of the hole, a, old chimney, leveled down by rain, 

 probably built in spring; h, fresh mud, brought up recently (beginning of fall 

 activity) ; wl, water level ; .r, place where the specimen (female, 77 mm. long) was 

 taken. 



Fig. 6. Burrow of < 'din/tanis (Vukjciu-^ Girard. Located in yellow clay and humns, at a springy 

 and swampy place in woods on the side of a wagon road, upon which water was 

 standing (after a heavy thunder-shower on the previous day), at Squaw Iiuu, Alle- 

 gheny County. Dug out by the writer, May 27, lit04. <i, chimney, consisting of 

 yellow clay ; h, " stopper " in the mouth of the chimney, distinctly differing from the 

 chimney, the material being yellow clay mixed with blackish mud and leaf-mould ; 

 id, water level ; /•, road, with mud-puddle n|>on it ; .r, place where the crawfish (male, 

 first form, 711 mm. long) was found. 



Fig. 7. Burrow of C'ctrnharus diofjenes Girard. Located in yellow and blue clay, on the l)order 

 of a swamj)y place, * dienley Farm, Pittsburgh, Allegheny County. After a sketch 

 furnished by Mr. !■ . E. Kelly, Nov. 14, 1904. sw, swamp; he, blue clay ; yc, yel- 

 low clay ; (', one-sided chimney, consisting of yellow clay (probably made iu spring 

 and summer) ; /(, new chimney, consisting of blue clay (fall activity, reclaiming of 

 old burrow at c) ; c, old burrow, filled in (during summer) with blue elav, taken or 

 washed in from near the mouth of the lower entrance (r() of burrow ; vl, water level ; 

 ■c, place where the crawfish was taken. 



Fig. 8. Burrow of Cambarns diogenea Girard. Located in blue and yellow clay on the bank 

 of a small stream, Schenley Farm, Pittsburg, Allegheny County. After a sketch 

 drawn l)y Mr. F. E. Kelly, Nov. 15, 1904. k, stream ; hr, blue clay ; //<•, yellow 

 clay ; a, new chimney, consisting of yellow clay, evidently coming from the newly dug 

 shaft going down vertically ; l>, upper end of ascending branch of hole, without open- 

 ing (possibly originally open, but sealed up, and the pile of mud overgrown and 

 obliterated by vegetation) ; vl, water level ; .r, place where the crawfish was taken. 

 The chimney at a shows fall activity, and the vertical shaft is being built by the 

 crawfish in order to get deeper down into the ground. 



Pl.\te XLII. 

 Fig. 1. Preglacial Monongahela River, after Leverett (1902, j). 89, fig. 1). 

 Fig. 2. Present range of Cambanis obacurus Hagen and C. projnnquus Girard. (Licluding 



variety Sdiiborni (Faxon)). 

 Fig. 3. Distribution of C'(Uiib<irus propinquuK Girard, propiuipms Konhonii (Faxon), and C. 

 obscurus Hagen. 

 (For further explanation, see legend on map, and text, p. 400-440). 



