h. Smaller. Length under 11 mm. 



a. Mandibles with a tootli on inner margin 



at base -^. ffyeaii, p. 11. 



h'. Mandibles not toothed. 



«'-. Posterior border of hypopygium 

 broadly emarginate. 

 «'. Head transverse ; distance between 

 articulation witli thorax and front 

 distinctly less than distance be- 

 tween eyes ^2?. shuekardi, p. 12. 



b^. Head rounder, distance between ar- 

 ticulation with thorax and front 

 about equal to distance between eyes. yE. davatus, p. 12. 

 h-. Posterior border of hypopygium entii'e, 

 not emarginate. 

 a\ Posterior border of pygidium me- 

 dially emarginate _ . . --£". lon(ji, p. 13. 



h\ Posterior border of pygidium entire, 

 not emarginate. 

 «*. Mandibles strongly convex ex- 

 teriorly, sickle-shaped, without 

 any projection on inner margin 

 at base. 



a\ Length 9-10-O mm jE.fece, p. 14. 



¥. Length 5-6 mm ^i". icrouyhtoni, p. 10. 



h*. Mandibles flat and broad at base, 



diminishing rapidly to an acute 



point at apex, broadened at base 



by a rounded projection on the 



inner margin. 



rt'. Tibise strongly clavate, apical 



two-thirds greatly enlarged. 



Carina beneath node of pedicel 



not prolonged posteriorly into 



a tooth JE. clavitibia, p. 14. 



¥. Tibiae not so strongly clavate, 

 apical two-thirds only slightly 

 enlarged. Carina beneath 

 node of pedicel prolonged 

 posteriorly into a tooth -S. latiscapus, p. lo. 



^ ^. 

 A. Head with an oval yellowish or reddish-white 

 spot on each side. 



a. The lateral spots on head placed high up, 



their posterior margins prominent, form- 

 ing small tubercles ^. martini, p. 17. 



b. The lateral spots on head placed lower 



down, their posterior margins not pro- 

 minent, not forming tubercles. 

 a' . Posterior margin of head transverse, as 



wide as in front M.ferfjmoni, p. 18. 



b' . Posterior margin of head not transverse, 

 narrower than in front. 

 a-. Length under 4 nun. : 1st joint of 



pedicel finely reticulate but shining. . ^E. Iccvicvpi^, p. 18. 

 6*. Length over 4 mm.; 1st joiut of 

 pedicel coarsely sculptured, rugose, 

 not shining IC hiti<jhami, p. 18. 



