400 MEMOIRS OF THE CARNEGIE MUSEUM 



hand and carpopodite pale vinaceous-pinh (ligliter than IV, 21). Basal joints of 

 antennae cyanine-hlue ; flagelluni annulated daldia-pvqjie (VIII, 2) and very pale 

 lildc (lighter than VIII, 19). Pereiopods pale-hlue, upper edges shading to china-blue, 

 near the bases irhitc. Lower side of l)ody whitish, on the abdomen suifused with 

 china-blue and pnle-blue. 



These brilliant colors fade more or less in old specimens, but the via rinc-blue 

 always remains the ground-color. A brownish or blackish deposit of mud often 

 obscures the colors, and such specimens often appear blackish-blae all over. 



Young individuals are semitransparent, with a distinct pale-blue hue on the 

 ■ abdomen and chehe, and heUotrojje-purple (VIII, 18) on the carapace. 



Distinct color varieties are rare, and the few observed will be mentioned below. 



The color of the newly laid eggs is hazel (IV, 12) or ocliraceous (V, 7) ; later on 

 they are vinaceous-buf {V, 15) on one side, pinkinli- white on the other. 



The Carnegie ^luseum possesses two hundred and seventy-nine specimens of this 

 species, two hundred and thirty-six of which are from Pennsylvania, and forty-three 

 from West Virginia. 



DISTRIBUTION. 



LOCALITIES EEPKESENTED IN THE CARNEGIE MUSEUM. 



Pennsylvania : Westmoreland County, Hill, (opposite Leechburg) ; Braeburn ; 

 Dundale ; Jeanette ; Allegheny County, south of Logan's Ferry, (C. V. Hartman 

 coll.); Hulton, (R. Dornberger coll.); Wilkinsburg, (D. A. Atkinson coll.); Edge- 

 wood Park, (type locality); Nine-Mile Run, Pittsburgh ; Fern-Hollow, Pittsburgh ; 

 Schenley Park, Pittsburgh ; Squaw-Run, near Aspinwall, (D. A. Atkinson) ; North 

 Versailles T(jwnship, (opposite Stewart) ; Jack's Run and Long Run, South Ver- 

 sailles Township ; Boston, (D. A. Atkinson); Thompson's Run, Kennywood, (F. E. 

 Kelley coll.) ; Carnegie, (D. A. Atkinson) ; Moon Township, (A. T. Shafer coll.) ; 

 Lashell's Hollow, Moon Township : Beaver County, Doctor Heights, Monaca ; Wash- 

 ington County, Francis Mine near Burgettstown ; Taylor.stt)wn ; Monongahela (Jity ; 

 West Brownsville ; Fayette County, Smithfield ; ( "heat Haven ; Greene County, Deer 

 Lick. 



West Virginia : Hancock County, C'ongo ; Hollidays Cove ; Brooke County, Col- 

 liers ; Ohio County, Elm Grove; Marshall County, Cameron; Nuss ; Monongalia 



County, Morgantown. 



PREVIOUS RECORDS. 



The only previous records are those given by Williamson (as C. dubius), 



Schenley Park and Fern Hollow, Pittsburgh, and iMoon Township, Allegheny 



( 'ounty. 



