xv > l Baker: The Malayan Mach&rotimz (59 



entirely referable to the frons. For purposes of description in 

 this paper, however, the entire superior surface of the head 

 between the eyes is termed vertex. 



Subfamily MACH>EROTlN/E sensu stricto 



Key to the tribes. 



a*. Body slender; scutellum arched and with a distinct dorsal furrow; 



pronotum without produced lateral angles. 



b\ Frons not produced above; hind tibia? without a tooth.... Machserotini. 



b\ Frons acutely produced above; hind tibise with one tooth..Sigmasomini. 



a*. Body very thick and stout; scutellum nearly flat and with dorsal furrow 



subobsolete; pronotum with lateral angles produced into high thin 



lamina? Maxudeini. 



Tribe MACHSEROTINI 



This tribe includes but one Malayan genus, so far as known. 



Genus MACJLSEItOTA Burmeister 

 Key to the species. 



a 1 . Claval vein apically forked. 



6'. Body of scutellum not high arched posteriorly, its greatest depth much 

 less than length; vertex anteriorly broadly rounded; spatulate scu- 

 tellar furrow about half length of body of scutellum (Plate I, figs. 



1 and 9) M. notoceras Schmidt. 



ft 2 . Body of scutellum high arched posteriorly, its greatest depth as seen 

 from side about equaling length; vertex anteriorly subangulate; 

 spatulate scutellar furrow much more than half length of body of 

 scutellum (Plate I, figs. 2, 3, and 10; Plate II, fig. 1). 



M. philippinensis sp. now 

 o J . Claval vein simple. 



6 1 . Median cell short and broad; length of vertex far less than width 

 between eyes posteriorly; spatulate scutellar furrow less than half 

 length of body of scutellum. 

 c\ Length of body of scutellum distinctly greater than that of pronotum; 

 length of scutellar spine less than once and a half the length of 

 body of scutellum; ocelli nearer to median line than to eyes (Plate 

 I, figs. 4, 5, 11, and 14; Plate II, figs. 3 and 4).. M. ensifera Burm. 

 c*. Length of body of scutellum subequal to that of pronotum; length 

 of scutellar spine a little less than twice length of body of scu- 

 tellum; ocelli as near median line as to eyes (Plate I, figs. 6 and 



12; Plate II, figs. 5, 6, and 13) M. hizonensis Schmidt. 



6\ Median cell long and narrow; length of vertex subequal to width 

 between eyes posteriorly; spatulate scutellar furrow much more 

 than half length of body of scutellum (Plate I, figs. 7, 8, and 13; 

 Plate II, figs. 2, 7, and 10) M. fusca sp. nov. 



In Machxrota notoceras, M. philippinensis, and M. ensifera 

 the sharp upper border of the scutellar spine is extended into 

 the scutellar furrow as a sharp median carina to half its length, 

 whereas in M. luzonensis and fusca, it scarcely enters this 



