No. 26.] 



ARTHROSTRACA OF CONNECTICUT. 



243 



nating far in front of outer one and extending as far as telson 

 while outer ramus extends more than half its length beyond the 

 abdomen. 



Color light brown with longitudinal row of yellow spots on 

 either side marking union of coxal plates and segments ; also with 

 markings of yellow wavy lines between the median line and the 

 longitudinal rows of yellow spots. 



Length 12.5 mm. 



Distribution: Sweden; Norway; Denmark; Germany; British 

 Isles ; Holland ; Belgium ; France ; and Turkey ; also New Mexico ; 

 Michigan ; Lake Erie, Syracuse, Norwich, New York City, New 

 York; Ohio; Rock Island, Illinois; Washington, District of 

 Columbia; New Haven, Connecticut. 



This species is found in woods, under logs, along roads, 

 under stones, in woodsheds, usually in moderately dry places. 



It may be distinguished from other terrestrial forms by the 

 great convexity of the body and its ability to roll up into a ball. 

 Armadillidium is the only other terrestrial form capable of roll- 

 ing into a ball but with this there can be no confusion because 

 of the pointed telson and prominent uropods of Cylisticus. 



Porcellio spinicornis Say. 



Fig. 79. Porcellio spinicornis. 



1818. Porcellio spinicornis. Say, Jour. Acad. Nat. Sci. Phila., 

 vol. I, p. 431- 



