September 1S98.J FS i CHE. 259 



often convex (Fig. 36a). Upper valves of ovipositor 

 with scoop shorter, the angle at junction with stem 

 more pronounced (Fig. 36a). Hind tibiae either 

 glaucous or red. Hind femora usually with conspicu- 

 ous dusky oblique bands. Mid-carina of pronotum 

 seldom distinct on prozona. . . M. atlanis. 



6'. Tegmina and hind femora immaculate or showing only 

 faint traces of spots or bands. No angulation at junction 

 of scoop and stem of ovipositor (Fig. 41a). Prozona fuller 

 proportionally, the dorsal line of pronotum horizontal. 

 Interspace usually sub-quadrate or transverse. Af. extrcmus. 

 S'. Interspace between mesosternal lobes sub-quadrate or distinctly 

 transverse. Species with relatively stout body, swollen prozona 

 (giving a thick-necked appearance, Fig. 43b), and tegmina not 

 passing hind femora. 



8. Tegmina about reaching end of hind femora. Interspace 

 but little transverse. 



9. Scoop of ovipositor very short, deeply concave, with a 

 single or no denticulation at base of outer edge ; lower 

 valves vi'ith the tips correspondingly short and decurved 

 (Fig. 42a). Hind tibiae usually glaucous but often red. 

 Tegmina flecked with dusky and pale spots, hind femora 

 obliquely banded. Lateral carinae of pronotum usually 

 bordered below on the prozona by a broad fuscous 

 stripe which is crossed obliquely by a distinct, narrow, 

 pale line. Prozona less inflated than in ioUinus and 

 body less robust. ..... M. minor. 



9'. Scoop rather long, the outer edge of basal half crenu- 

 lato-denticulate, the tips of both pairs of valves long 

 and evenly tapering (Fig. 43a). Hind tibiae coral red. 

 Fuscous stripes on prozona indistinct, often lacking. 

 Tegmina maculate and hind femora obliquely banded. 

 A robust species with noticeably tumid prozona and 

 thick-necked aspect (Fig. 43b) . . . M. collinus. 



8'. Tegmina reaching but one-half or two-thirds the length of 

 the hind femora. Interspace rather strongly transverse. 



10. Hind femora with conspicuous oblique dusky bands, 

 at least above. Hind tibiae red. Tegmina usually 

 dark brown, flecked with dusky and pale spots. A 



