230 REPORT OF NEW JERSEY STATE MUSEUM. 



• Stoller, 54th Rep. N. Y. State Mus., L 1900 (1902), p. 213T. Sche- 

 nectady, N. Y. 



Paulmier, 58th Rep. N. Y. State Mus., IV, 1904, p. 183, fig. 56. All 



over New York City. 



H. Richardson, Bull. U. S. Nat. Mus., No. 54, 1905, p. 621, fig. 671. 



Ocean Grove, New Jersey. (Niagara; Westfield and New York City, N. 

 Y. ; Woodside, Md. ; world-wide.) 



M. J. Rathbun, Occas. Papers Boston Soc. N. Hist., VII, 1905, p. 46. 



(New England.) 

 PorcelUo nigra Say, Journ. Acad. Nat. Sci. Phila., I, 1817. p. 432. Pennsyl- 



z'ania. 



De Kay, N. Y. Fauna, Crust., VI, 1844, p. 52 (on Say). 



— Underwood. Bull. 111. Lab. N. Hist., II, 1886, p. 362. Pennsylvania. 



PorcelUo niger Wliite, Cat. Crust. Brit. Mus., XXV, 1847, p. 99. Pennsylvania 



(Say's material). 



Description. — Body not capable of being rolled up into a ball, 

 ovate, and length less than twice width. Head width twice its 

 length, front edge trilobate, has a median and lateral lobe each 

 side. Median frontal lobe triangular, though apex obtuse, and 

 rounded lateral lobes extend as far forward as median lobe. 

 Eyes rounded, composite, small, and placed at base of expansions 

 extending laterally and in front. First antennae rudimentary, 

 formed of three segments, obsolete. Second antennae with short 

 basal segment, second segment about one and one-half times 

 length of first, third segment long as second, fourth segment 

 nearly twice length of third, and fifth segment nearly twice 

 length of fourth. Flagellum formed of two unequal segments, 

 of which first shorter. Second antennae reach middle of third 

 thoracic segment. Maxillipeds with a palp formed of three seg- 

 ments. Mandibles without palps. Thoracic segments subec|ual, 

 and without indication of epimera on any of segments. Ab- 

 domen broad as thorax, first two segments covered laterally by 

 lateral parts of seventh thoracic segments. Sixth or terminal 

 segment produced in narrow triangle, rounded behind, base 

 greater than length. Uropoda longer than terminal abdominal 

 segment, outer branch extending slightly beyond and inner 

 branch just reaches tip of last body segment. Legs all ambu- 

 latory. Surfaces of body segments all covered with small 

 tubercles. Color varies from nearly uniform gray-black to paler 

 or brownish, varied with dark to blackish spots of irregular 



