1	Humeral angles acutely spined (Figs 5, 13)	2
–	Humeral angles not acute, rounded (Fig. 9)	M.nugax Stål, 1872
2	Only the basal portion of the first visible labial segment blackish (Fig. 3)	M.nigriceps Burmeister, 1835
–	First visible labial segment entirely blackish (Fig. 14)	M.tipuliformis Burmeister, 1838