384 The Philippine Journal of Science ms 



above; tegmina smoky hyaline, tips fuscous, extreme base black 

 and punctate ; legs ferruginous. 



Head twice as broad as long, somewhat rugose, pubescent with 

 golden hairs; eyes extremely large and prominent; ocelli trans- 

 lucent, much farther from each other than from the eyes and 

 situated about on a line passing through center of eyes; face 

 sharply emarginate before clypeus; clypeus longer than broad, 

 distinctly set off from head, pubescent at extremity. Pronotum 

 not greatly elevated, vertical above head, flat between horns, per- 

 current dorsal carina, dorsal line practically straight; humeral 

 horns triquetrous, compressed, broad at base, tips sharp, almost 

 flat above, extending almost directly outward, very slightly up- 

 ward and backward; posterior process reaching just beyond 

 internal angle of tegmina, stout at base, gradually acuminate, 

 very slightly depressed in middle, tip faintly depressed, dorsal 

 carina percurrent, a lateral carina on each side near margin. 

 Scutellum distinct, pilose. Tegmina smoky hyaline, veins brown, 

 a broad fuscous cloud at tip, base narrowly black and punc- 

 tate; five apical and two discoidal areas. Hindwings iridescent 

 hyaline, border clear and somewhat wrinkled. Undersurface of 

 body black. Legs ferruginous brown ; femora moderately swol- 

 len; tibiae spined; tarsi flavous. Type, female. 



Length, head to tip of tegmina, 7 mm. ; width between extrem- 

 ities of horns, 3.6 mm. 



Palawan, Puerto Princesa (Baker) . 



Genus TRICENTRUS Stal 

 Centrotus Fabr. (in part) ; Taloipa BucKT. 



Tricentrus is a well-defined and easily distinguished genus. It 

 is the only genus which shows both the suprahumeral horns and 

 the spined posterior trochanters, the latter character appearing 

 to be a very reliable and sufficient structure for diagnosis. These 

 spines, or teeth, on the inner surface of the posterior trochanters 

 are found also in the genera Sipylus and Centrotoscelus, but 

 neither of these genera has suprahumeral horns. The function 

 of such a structure is conjectural. The hind wings have three 

 apical areas. 



Four species have been described from the Philippines, all of 

 which are recognizable from material at hand. These species, 

 together with two herein described, may be separated as follows : 



Key to the Philippine species of Tricentms. 



a\ Suprahumeral horns at least twice as long as the distance between their 

 bases couvergens. 



