148 MISCELLANEOUS FOREST INSECTS. 



6. Postocellar area well defined, twice as wide aa the cephalo-caudal length, flat, 



stigma narrow; lanceolate cell of the fore-wings narrowly contracted (see 



figure) alpcstris Roh.wer. 



Postocellar area convex, not so sharply defined; stigma broader; contraction of the 

 lanceolate cell distinctly longer than the width of the cell (see figure), 



halcyon Norton. 



7. Mesopleurae and pectus black 8. 



Mesopleurae and pectus pale 12. 



8. Legs entirely fulvo-ferruginous; orbits continuously pale 9. 



Legs more or less black or dusky, especially the posterior pair; orbits not con- 

 tinuously pale 11. 



9. Ocellar basin of the normal type, open below, poorly defined; saw with very long 



truncate teeth which are narrower at their bases; (clypeus deeply emarginate, 



lobes narrow) orbitalis Rohwer. 



Ocellar basin small, punctiform present only just in front of the anterior ocellus; 

 saw with narrow teeth 10. 



10. Clypeus broadly, angulately emarginate, lobes sharply triangular; head distinctly 



punctured; stigma gently rounded below l-oehelei Rohwer. 



Clypeus arcuately emarginate, lobes broad, obtusely rounded, head shining, very 

 sparsely punctured; stigma strongly tapering alpestris Rohwer. 



11. Supraclypeal area shiny, flattened, or but slightly convex; stigma rounded on 



the lower margin; clypeus very shallowly emarginate hioculata Rohwer. 



Supraclypeal area roughened, strongly convex; stigma strongly tapering; clypeus 

 rather deeply, angulately emarginate californka Rohwer. 



12. Third antennal joint distinctly longer than the fourth 13. 



Third and foiuth antennal joints subequal 14. 



13. A small circular fovea in front of the anterior ocellus, mesoscutum with black spots 



laterally viarlatti Rohwer. 



No small fovea in front of the anterior ocellus; mesoscutum immaculate, 



nevadensis Rohwer. 



14. Ocellar basin practically wanting 15. 



Ocellar basin large, distinct 16. 



15. Middle fovea wanting; sheath narrowly rounded apically. . paW/pcs MacGillivray. 

 Middle fovea represented by a large shallow depression; sheath narrowly truncate 



apically xantha Rohwer. 



16. Sheath narrowly rounded apically; stigma broadest at base, tapering to apex, 



halcyon Norton. 



Sheath obtusely rounded or sub truncate apically: stigma narrower, gently 



rounded below 17. 



17. Scape black; sheath subtruncate apically. front of head closely punctured, 



occidentalis Rohwer. 



Scape pale; sheath obtusely rounded apically; front of head with separate, small, 



distinct punctures montanicola Rohwer. 



o 



