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6 A keel between the dorsal and ventral parts of the head 

 6 MclichavcUa 



6a No such keel (7; 



7 Pronotum strongly striate obliquely (8) 



7a Pronotum transversely striate, if at all ("''*) (f)) 



8 Anterior margin of dorsal part of head almost rectangu- 

 lar ; face flattish. (type vivcsccns) 7 Macropsis 



8a Anterior margin roimded ; face cc»nvex (type tiliac) . . . . 

 8 Pcdiopsis 



9 Ocelli immediately at the base of the ventral part of the 

 head 9 Epipsychidion 



9a Ocelli well on the ventral part ( 10 ) 



10 Tegmina reticulate apically. Frons angulate in profile, as 

 also clypeus. Hind tibiae with 2 or 3 strong spines. Last or- 

 dinary sternite (female) bipartite ( i O 



10a Tegmina not reticulate apically. Frons not angulate in 

 profile, nor clypeus. Hind tibiae multispinulose. Last ordinary 

 sternite (female) not divided (12) 



11 Last ordinary sternite (female) reaching the lateral mar- 

 gins of the abdomen 10 Eiiryinclops 



iia Last sternite not nearly reaching the lateral margins 



.i II Eiiryiiicla 



12 Lc,ra not nearlv touching the apical margin of the clvpeus 



■ "(13) 



12a Lora practically touching the apical margin (141 



13 Frons separated basally ; legs more or less specialized. . . . 

 12 Alseis 



J 3a Frons not se])arated basally ; legs normal 



13 Oiicopsis. {■=Bythoscopus auctt ; type fknncollis) . 



14 Frons separated basally. Antennae inserted in a feeble 

 cavity, their bases free (15) 



14a Frons not separated basally. Antennae inserted in a deep 

 cavity, beneath a ledge (17) 



] 5 Pronotum transversely striate ; nymphs not horned nor 



dorsally serrate, (type sanguinolcntus Provancher) 



14 (***) AccratagaUia 



15a Pronotum not striate; nymphs horned and serrate. . . (16) 



16 Posterior margin of vertex regularly curved, the vertex 

 being obsolescent behind the eyes. Nymph with two anterior 



** Sometimes, in Ofirop.sis, the striation becomes a little oblique anteriorly. 

 *** These characters were pointed out an<I used ior divisional purposes by Osborn 

 and Ball in their treatment of Ayallia. They are good genera, in my opinion. 



