xv > l Baker: The Malayan Mach&rotirue 73 



cross wrinkled within, and with borders but little raised; lower 

 posterior angle of posterior border of scutellum unusually prom- 

 inent. Spine strongly curved, its point 1 millimeter above the 

 apex of tegmina. 



Two females of this fine species were taken at Baguio, Moun- 

 tain Province, Luzon, Philippine Islands. 



Tribe SIGMASOMINI 



Key to the genera. 



a\ Vertical projection of head very long and sword-shaped, the head thus 

 longer than pronotum Sigmasoma Schmidt. 



<r. Vertical projection of head shortly acute, the head much shorter than 

 pronotum Grypomacha:rota Schmidt. 



Genus SIGMASOMA Schmidt 



Sigmasoma bifalcata Schmidt. 



Sigmasoma bifalcata Schmidt, Ent. Zeitg. Stettin 68 (1907) 181. 



This remarkable insect was described from Java, but similar 

 forms will probably be discovered in other parts of Malaya also. 



Genus GRYPOMACILffiKOTA Schmidt 



Schmidt ' describes but one species of this genus, G. turbinata, 

 crediting it to Java, Sumatra, and Borneo. Due to the very 

 imperfect figures presented by him, and his very insufficient de- 

 scription, it may be fairly questioned if all of his material 

 belongs to one species. As shown hereinafter, some species 

 which present an extraordinary similarity in color, are com- 

 pletely distinct structurally. Schmidt's failure to give full 

 structural details makes it difficult to compare G. turbinata with 

 the three species recorded herein from Borneo. 



Key to the species. 



a 1 . Medial cell about five times as long as wide and far longer than stem 

 vein; anterolateral and posterolateral margins of pronotum deeply 

 incurved; length of frons above eyes greater than length below 

 antennae; posteroinferior angle of scutellum high above lower margin 

 and minutely acute; color pale, darker punctured; face pale with 

 dark crossbars (Plate II, figs. 8, 9, and 11; III, figs. 1, 4, 5, and 8). 



6. borneensis sp. nov. 



<x\ Medial cell little more than twice as long as wide or less, and shorter 



than stem vein; anterolateral and posterolateral margins of pronotum 



not deeply incurved; length of frons above eyes less than length below 



antennae; posteroinferior angle of scutellum in line with lower margin, 



and large, obtuse; color dark, head black. 



b\ Scutellar spine not strongly decurved, its apex far above apex of 



tegmina. 



7 Ent. Zeitg. Stettin 68 (1907) 183. 



