1892.] NATURAL SCIENCES OF PHILADELPHIA. 31 



Steatoda borealis Hentz. 



Common often about buildings. 

 Steatoda marmorata Hentz, 



Not uncommon in gorge?. 

 Steatoda guttata Reuss. 



Uncommon, Primrose Cliff, Inlet Marsh ; Nov., Dec. 

 Steatoda triangulosa Walck. 



Two specimens. 



Dipoena nigra Em. 

 Steatoda nigra Em. 



Not uncommon, Fall Creek, Six Mile Creek. 



Argyrodes trigonum Hentz. 



Not uncommon in Linyphia webs in gorges. 

 Euryopsis funebris Hentz. 



One specimen on campus. 

 Pholcomma hirsuta Em. 



Not uncommon, Buttermilk and Fall Creeks; during autumn 

 and winter. 



Erigoninse. 



Ceratinella fissiceps Cambr. 



Not uncommon in grass in spring and summer. 

 Ceratinella similis, nov. sp. Plate V, figs. 61, 61a and 61b. 



Total length 9 and S l-4mm. 



Male sometimes a little smaller than female. Cephalothorax 

 orange ; eye region black ; legs light yellow-brown ; mandibles and 

 sternum orange ; abdomen whitish, with a slight grayish-yellow 

 tinge ; epigynum and spinnerets dark or black ; $ palpi with tarsus 

 black ; hard spot on male dorsum, orange ; muscular impressions of 

 female orange and hard, no hard spot on dorsum ; hard spot at 

 base of venter, and a little spot in front of spinnerets ; head of male 

 elevated and projecting cephala but not humped ; head of female 

 normal. 



Frequent, Six Mile Creek, South Hill, Sept., Nov., Apr. 



Ceratinella minuta Em. Plate 11, fig. 60. Plate IV, fig. 60. 

 Not uncommon, Fall Creek, Aug. 



