xv, i Baker: The Malayan Machxrotinse 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 1 . Vertical projection of head very long and sword-shaped, the head thus 
longer than pronotum Sigmasoma Schmidt. 
a\ Vertical projection of head shortly acute, the head much shorter than 
pronotum Grypomachasrota Schmidt. 
C-enus SIGMASOMA Schmidt 
Sigmasoma bifalcata Schmidt. 
Sigmasoma bifalcata Schmidt, Ent. Zeitg. Stettin 63 (1907) 181. 
This remarkable insect was described from Java, but similar 
forms will probably be discovered in other parts of Malaya also. 
Genus GRYPOMACJLffiRQTA Schmidt 
Schmidt 7 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 live 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). 
G. 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 1 . Scutellar spine not strongly decurved, its apex far above apex of 
tegmina. 
Ent. Zeitg. Stettin 68 (1907) 183. 
