244 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



1899. Porcellio pictus, G. O. Sars, Crust. Norway, vol. 2, 

 p. 177, pi. 78, fig. I. 



1902. Porcellio spinicornis, Stoller, 54th Rept. N. Y. State 

 Mus., p. 213. 



1905. Porcellio spinicornis, Richardson, Bull. U. S. Nat. 

 Mus., No. 54, p. 619. 



1905. Porcellio spinicornis, Paulmier, Bull. N. Y. State Mus., 

 No. 91, p. 



Body oblong-oval, considerably depressed ; surface rough, with 

 less dense tubercles than in P. scaber. 



Head with very large lateral lobes which are slightly curved 

 outwards; frontal lobe less prominent, broadly rounded. Eyes 

 large, compound, situated at the base of the lateral lobes. 



First pair of antennse inconspicuous. Second pair rather 

 slender and nearly one-half as long as body ; second and third 

 peduncular joints with a carina on the outside which is pro- 

 duced to a dentiform projection; flagellum not as long as last 

 joint of peduncle, composed of two joints of which the proximal 

 is nearly twice as long as the distal one. 



Coxal plates of thorax well developed with posterior corner 

 acuminate. Last pair of legs more strongly built in the male 

 than female, with carpus dilated. 



Abdomen scarcely one-fourth as long as body; third to fifth 

 coxal plates prominent and recurved. Telson strongly produced, 

 one and a half times as long as broad at the base, terminal part 

 acute. Opercular plates of only the first and second segments 

 of abdomen provided with air cavities. Uropods with rather 

 broad outer ramus. 



Color, yellowish gray, variegated with dark brown patches, 

 generally arranged in five long series. 



Length 13 mm. 



Distribution ; Sweden ; Norway ; Denmark ; Russia ; Germany ; 

 France; Great Britain; Hungary; also New York City, Niagara 

 Falls, New York ; Goshen, New Haven, Connecticut. 



The species occurs in crevices of rocks and on shady lime- 

 stone ledges (Stoller) and also in damp cellars, etc. 



It is distinguished from the two following species by the 

 spotted body and yellow color, and the flagellum of the second an- 

 tennae, the first joint of which is a little longer than the second. 



