26 PROCEEDINGS OF THE ACADEMY OF [Feb., 



alternating in length to the marked degree found in Xanihomantis. 

 Cephalic tibia with ventro-external margin armed with very numer- 

 ous (twenty-five and twenty-six) and closely placed spines increasing 

 in length distad but with two in the series and two before the very 

 elongate terminal spine much more elongate; ventro-internal margin 

 armed with very numerous (twenty-five) and closely placed spines, 

 elongate and slender and increasing slightly in length distad, except 

 the proximal spines which are very small. Caudal limbs absent 

 from the specimen at hand. Cerci slender, moderately elongate, 

 terminal joint very elongate oval; these appendages much as in 

 the specimen of Xanthomantis before us. Apex of abdomen crushed 

 in specimen under consideration. 



Polyacanthopus mantispoides new species. (Plate I, figures 3 and 4.) 



The present species shows a very close general resemblance to 

 Xanthomantis flava Giglio-Tos; having, however, many important 

 differences as given in the generic description. 



Specialization, considering the astonishingly great numerical 

 abundance of spines on the cephalic tibiae, would appear to have 

 reached a condition almost detrimental to the effectiveness of the 

 grasping limbs in the present species. 



Type. — d* ; Sandakan, British North Borneo. (From C. F. 

 Baker.) [Hebard Collection Type No. 517.] 



In addition to the features given in the generic description, we 

 would note the following for this remarkable species. Dorsal pair 

 of ocelli very large, ventral ocellus large. Occiput, immediately 

 above these, showing a small but well defined convexity, with a 

 minute but distinct transverse carina and a vertical carina extend- 

 ing briefly dorsad, the juncture of these carinae forming a weak 

 median projection. Internal margins of eyes concave and weakly 

 divergent dorsad. ^^ Medio-longitudinal carina of pronotum strongly 

 developed and lamellate, as is characteristic of the group Tropi- 

 domantes. Short, straight, transverse veinlets occur in the opaque 

 portion of the marginal fields of the tegmina and wings, connecting 

 the marginal and mediastine veins. Stigma subobsolete. Apex of 

 abdomen crushed. Cercus considerably less than twice as long as 

 exposed portion of subgenital plate, segments increasing in length 



'* In the female of X. flava at hand these margins are feebly concave and 

 rather decdedly divergent dorsad, while in that specimen a minute but well 

 developed tubercle is found on each side between the antennal sockets and the 

 ocular margins. 



