380 MEMOIRS OF THE CARNEGIE MUSEUM 



Size. — This species in western Pennsylvania reaches a considerable size, although 

 the niaxinium recorded l)y Hagen (.'!.G = 91 mm.) has not been observed. Faxon, 

 (1885o, p. 64), mentions a specimen from the Mammoth Cave, Ky., measuring 108 

 mm., but this is not the typical form. The largest individuals in the Carnegie 

 Museum are two females, the one from Braeburn, the other from Derry, Westmore- 

 land County, both measuring 87 mm. in length. The largest male (first form) is 

 from North Versailles Township, Alleglieny County, and measures 83.5 mm.'' In 

 Avestern Pennsylvania specimens over 80 mm. ai'e not altogether rare. 



In the eastern portions of the state this species is much smaller. The largest 

 specimen at hand is a female from Hoxboro, 07 mm. long, and a male (first form) 

 from Manayunk, Philadelphia ( Jounty, 66.5 mm. long, (both collected by H. Cera). 

 Specimens over GO mm. are not frequent in eastern Pennsylvania. 



Colors. — Generally dull and not much varied, greener in 3^oung specimens, 

 browner in old ones. (See Plate B, Fig. 1.) 



The carapace and abdomen olive-green (Ridgway, 1880, X, \8) to tawitij-otive 

 (III, 17), chfstniit (IV, 9), and hnnil umher (III, 8), a shade darker dorsally, lighter 

 on the sides. Margins of rostrum, in llie browner specimens, fcrragiiieous (IV, 10). 

 Distal third of finger rvfuns (IV, 7), or town)/ (V, 1 ). Tul>ercles of the cutting edges 

 of fingers ochnicco/i-^ Jinff' (V, 10). In brown iiidiviihuds there is generally some 

 green on the chelse. 



Aside from young individuals, where the normal olive-green prevails, this species 

 shows a distinct tendency toward the brown and chestnut shades, more so than the 

 river .species, C. limosn.'t, (_'. propi iii[iin-'<, and '". oli.^c/Arm. 



In some cases the colors are brighter. Individuals shading to a copper-color are 

 not rare, and I have seen a few where a dirty slate-ljlue was the ground-color. Of 

 coui'se, as in other species, in old si)ecinieus the original colors are largely obseui-ed 

 by a deposit of mud, rendering tiie specimens sometimes almost black. 



In verv young specimens (10 to 20 mm. long) the col(.)r is olive-green, .semitrans- 

 parent, with the chehT3 almost entirely ferrugineous. 



The color of the newly laid eggs is almost black, with, or without, a purplish hue 

 {ivdixuL-jntrplc, VIII, ('>). In a more advanced stage they become particolored; 

 prune-par pic {Will, l)or dahlin-parple {\ll\, 2) on one side, graijishov whiti'sh on 

 the other. 



The Carnegie Museum possesses seven hundred and fifty-five specimens of this 

 species, six hundred and fourteen of which are from the state of Pennsylvania, 



"The female from Hill, We.stmorelaud County, mentioned previously (Ortmann, 1905((, p. 391) is 85 mm., not 

 89 mm. as stated ; the male from Cheat lih-eT {ibid. ) is not 92 mm., but 82 mm. in length. 



