AKT. L>8 KEVISION OF DISONYCHA NORTH OF MEXICO BLAKE H 



18. Elytra distinctly punctate discoidea var. abbreviata (p. 44). 



Elytra very indistinctly punctate leptolineata (p. 44). 



19. Head entirely pale, antennae unusually long and slender, extending fully to 



the middle of (he elytra in female tenuicornis (p. 32). 



Head with labrum and sometimes tubercles and occiput dark, antennae not 

 unusually long or slender and not extending to the middle of the elytra 

 in female 20 



20. Prothorax with distinct lateral callosities, head coarsely punctate. 



pluriligata (p. 25). 



Prothorax smooth, head smooth and shining except for a group of coarse 



punctures about fovea on each side jfigurata (p. 35). 



21. Head entirely pale (sometimes tip of mandibles darkened) 22 



Head either entirely dark, or pale with occiput, tubercles, or labrum 



dark 24 



22. Pronotum not distinctly spotted, elytra polished and with very narrow 



vittae, the sutural and submarginal vittae pale and somewhat indistinct; 



southern Texas stenosticha (p. 63). 



Pronotum distinctly marked with two anterior spots, elytra not polished, 

 the vittae distinct and not unusually narrow 23 



23. Antennae long and slender, extending beyond the middle of the elytra, elytra 



broadly oblong; Arizona tenuicornis (p. 32). 



Antennae not unusually long, scarcely reaching the middle of the elytra ; 

 elytra oblong oval; Massachusetts to Texas caroliniana (p. 33). 



24. Head entirely dark except at base of antennal sockets 25 



Head not entirely dark 27 



25. Small (5 to 6 mm), elytra markedly costate in female, very indistinctly 



punctate (see also description of dark variety of procera). 



pansy Ivanica (p. 12). 



Larger (6 to 8 mm), elytra with only traces of costae in female, distinctly 



punctate 26 



26. Aedeagus dark (see pi. 1, fig. 5) ; California limbicollis (p. 19 j. 



Aedeagus paler and slightly different in shape (see pi. 1, fig. 4) ; east of 



Rocky Mountains uniguttata (p. 17). 



27. Prothorax more or less uneven, with lateral callosities, elytra more or less 



costate in female 28 



Prothorax always smooth and without depressions or callosities, elytra 

 never costate in female 34 



28. Head not densely or rugosely punctate, and with a broad dark occipital 



band extending to and often covering tubercles 29 



Head densely and usually rugosely punctate, and with at most only a 

 narrow dark occipital band or spot, never extending to tubercles 30 



29. Aedeagus with ventral lip tapering and acute (see pi. 8, fig. 42) ; Colorado. 



brevicornis (p. 62). 



Aedeagus with ventral lip broad, not tapering (see pi. 1, fig. 3) ; Atlantic 



coast to Rocky Mountains and Oregon procera (p. 15). 



30. Prothorax densely and coarsely punctate; Pacific and Northwestern States. 



latiovittata (p. 23). 

 Prothorax not so densely and rather indistinctly punctate 31 



31. Elytra densely and sometimes confluently punctate 32 



Elytra not dou.sely and not confluently punctate 33 



32. Prothorax with distinct lateral callosities, not very convex, elytra coarsely 



and confluently punctate schaefferi (p. 24). 



Prothorax without distinct lateral callosities, convex, elytra densely but not 

 so coarsely and not confluently punctate punctigera (p. 28). 



