1906.] NATURAL SCIENCES OF PHILADELPHIA. 43 



distinct transverse sulcus; lateral carinse distinct cephalad and caudad, 

 subobsolete mesad with the constriction slight ; lateral lobes slightly 

 over half as deep again as long, cephalic and caudal margins subparallel, 

 ventral margin rounded obtuse-angulate. Tegmina distinctly (d^) or 

 moderately exceeding the apex of the abdomen, but only slightly 

 exceeding the tips of the caudal femora; costal expansion slight, ow, 

 apex rotundato-truncate; postradial area irregularly areolate. Ceph- 

 alic and median limbs rather slender. Caudal femora robust, inflated, 

 the distal portion slenderer and with the pregenicular portion con- 

 stricted, carinse strongly ribbed, pattern of the pagina distinct and 

 regular; caudal tibiae with eleven spines laterad, longer internal spur 

 slightly more than twice the length of the shorter, sharply curved 

 distad but not distinctly hooked. 



Figs. 14 and 15. — Scyllina instabilis n. sp. Female type. Dorsal view of head 

 and pronotum and lateral view. (X 1^.) 



General color ranging from ochraceous-rufous (male) to dull hazel 

 and clay color (female). Head with a blackish postocular bar distinct 

 in the male, slight in the female ; infraocular line very distinct in the 

 male, absent in the female; lateral margins of the frontal costa and 

 ventral portion of the lateral foveolse lined with blackish, more distinct 

 in the male than in the female; face and sides of the head blotched 

 with a darker brown in the female; eyes rather cinnamon in the male, 

 pale Isabella color in the female; antennae of the general color. Pro- 

 notum of the male clear ochraceous-rufous, with the lateral 

 carinae slightly marked cephalad, the lateral lobes with a broad 



