1892.] NATURAL SCIENCES OF PHILADELPHIA. 37 



upper M. E. can not be seen in a front view. The sternum is very- 

 broad, and the anterior margin is straight. The groove and hole 

 on head is just above the S. E. 

 One specimen, Fall Creek, Jan. 



Lophocarenum spiniferum Cambr. 



One specimen. South Hill, Oct. 

 Lophocarenum crenatum Em. 



Several specimens. Six Mile Creek. 

 Lophocarenum crenatoideum, nov. sji. Plate lY, figs. 8, 8a and 8b. 



Length $ l'5mm. 



Cephalothorax brownish-yellow ; eyes surrounded by black ; a 

 blackish line around head ; legs white or nearly colorless ; steinum 

 yellowish-brown, quite dark ; mouth-parts and mandibles pale 

 yellowish ; abdomen shining, dark gray, a little greenish, with long 

 white hairs ; palj^al organ scarcely colored ; cephalothorax with 

 sides crenate ; head narrowed at upper M. E., then widened ; a few 

 cross ridges on middle of cephalothorax ; cephalothorax broadest at 

 about middle; an elongate groove just behind S. E., hole at 

 cephalic end of groove. 



One specimen. Six Mile Creek, Sept. 



Lophocarenum erigonoides Em. Plate IV, tig. 9. 



Several specimens. Six Mile Creek, Sept. ; Fall Creek, Feb. 

 Lophocarenum formosum, nov. sp. Plate lY, fig. 10. Plate V, fig. 10. 



Length $ l-2mm. length 9 l'4mm. 



Cephalothorax bright browmish-yellow ; head darker ; marginal 

 seam black; legs paler than cephalothorax; sternum red-brown, 

 edges nearly black ; abdomen nearly black, lighter on venter of 

 female ; a line of pale spots on each side of venter ; abdomen long- 

 haired ; tibia of male palj^us with two black teeth ; head of female 

 scarcely elevate 3, male considerably raised; hole just behind the 

 S. E. ; farther caudad near the end of head is a groove. 



Several specimens. South Hill, Six Mile Creek, May, Oct. 



Lophocarenum arvensis, nov. sp. Plate IV, fig. 11. 



Length 9 2mm. 



Cephalothorax and mandibles dark red-brown ; darkest on head, 

 which is but little elevated, not humped ; palpi red-brown ; legs 

 bright brownish-yellow ; sternum red-brown ; abdomen nearly 



