1802.] NATURAL SCIENCES OF PHILADELPHIA. 33 



jecting anteriorly ; dorsal hard spot large, covering nearly all the 

 dorsum. A female from Cascadilla Creek has a darker abdomen, 

 and the hard spot is brighter than in male ; sternum is darker on 

 sides ; cephalothorax is more yellow as is also the legs ; the hard 

 spot has no distinct limits. 



Uncommon, Cascadilla Creek, Burdick's Glen ; Sept., Feb. 



Ceratinella formosa, nov. sp, Plate II, figs. 55 and 55a. 



Total length 9 l-Smm. 



Cephalothorax dark yellow-broAvn ; darkest at cephalic end ; legs 

 pale brownish-yellow; sternum dark; abdomeu nearly black, 

 except the upper part of the base, which is covered by a hard spot 

 extending only a little way on the dorsum ; this is a bright orange- 

 red color ; head not elevated ; ou apex of dorsum a few faint narrow 

 chevrons of white ; the four muscular impressions are about over 

 the middle of the abdomen, the hind pair not much farther apart 

 than are the front pair ; these are also reddish in color; abdomen 

 widest somewhat behind the middle. 



Rare, Fall Creek, Sept. 



Ceratinella annulipes, nov. sp. Plate II, figs. 56, 56a and 56b. 



Length 9 TSmm. 



Cephalothorax dark chestnut brown ; sternum dark red-brown ; 

 abdomen dark gray, nearly black above ; legs red-brown, most of 

 patella and ends of other joints yellowish; no hard spot, ends of 

 muscles form reddish impressions on dorsum ; head not elevated ; 

 epigynum as figured. 



One specimen. 



Ceratinopsis interpres Cambr. 



Two specimens, Six Mile Creek and Round Marshes, Oct., Apr. 

 They are redder than in the description of Emerton. 



Ceratinopsis nigriceps Em. 



Frequent, Six Mile Creek, Buttermilk Creek, Cascadilla Creek, 

 Inlet Mai'sh, Sept., Jan. 



Ceratinopsis nigripalpis Em. 



One young specimen. Buttermilk Creek, Sept. 

 Ceratinopsis frontatus, nov. sp. Plate V, fig 63. 



Length 9 l*5mm. 



Cephalothorax dull yellowish-brown ; blacker on head, which is 

 somewhat raised ; legs a dull orange or brownish-yellow ; sternum 



