1920.] NATURAL SCIENCES OF PHILADELPHIA. 75 



lation. In addition the tegmina and wings show the most decided 

 distal truncation known. 



Nearest relationship is with A. australis Saussure, the present 

 female differing from a female of that species before us, in addition 

 to the features stated above, in having the spine above the ocelli 

 minute, very much smaller than the spine above the summit of the 

 facial scutellum, the tegmina with marginal field fully as broad 

 proximad but narrowing sharply in distal third, rather than narrow- 

 ing very gradually. The free margin of the axillary field of the 

 wings is not tinged with dark brown, agreeing in this respect with 

 all known material of australis from Waigiou and the Aru Islands, 

 which marginal suffusion distinguishes, however, all material of 

 that species known from New Guinea. 



Type. — Labuan Island, British North Borneo. [Hebard Collec- 

 tion Type No. 527.] 



Size large and form very robust for the genus, generally similar 

 to australis except in the following respects. Head with supra- 

 ocellar spine represented by a minute blunt projection less than 

 half as high as the spine at the dorsal apex of the facial scutellum, 

 which spine is as well developed as in australis. Occiput with four 

 deep and broad vertical sulcations; summit of occiput slightly 

 raised above the eyes, transverse, weakly convex from lateral sulci 

 to eyes. Ocelli small, slightly smaller than in this sex of australis, 

 similarly arranged in a triangle which is distinctly wider than high. 

 Pronotum similar to that of australis except that it is shorter and 

 heavier with the blunt teeth on the lateral margins fewer in number 

 but decidedly heavier and longer. Tegmina as in that species but 

 suddenly and broadly truncate distad, almost as if the distal quarter 

 of a tegmen, such as is developed in australis, had been clipped off; 

 marginal field very broad in proximal two-thirds, suddenly narrowing 

 so that it is obsolete in the greater portion of the distal third; mar- 

 ginal field opaque, dorsal field transparent but with a heavy net- 

 work of minute veins, which become so numerous and crowded 

 toward the marginal field, and particularly toward the bases of the 

 oblique veins, as to cause these portions to be almost opaque. Wings 

 with anterior field sharply truncate, hardly reaching beyond apex 

 of axillary field, portion of anterior field between mediastine vein 

 and free margin opaque along the distal portion of the anterior 

 field; axillary field transparent, very weakly tinged v\ith brown. 

 Cephalic coxae with cephalic margin armed with (six) heavy blunt 



