HIPPODAMIA. 



53 



Form linearis Fitch. 



The scutellar mark linear, not dilated. 

 Form approximata Fitch. 



The humeral spots touch the base of the elytra. 

 Form disco-punctata Fitch. 



Spot 5 thick and round instead of oblong. 



Form tridens Fitch. 



Spot 5 separate from 4+t>. In many localities this exceeds the type in abundance. 

 At Stony Lake, Oceana County, Michigan, 29 per cent of 652 have spot 4 

 separate, 3 per cent transition, and 68 per cent confluent in some degree. 



Form confluenta Fitch. 



Spots 5+4+6. Strongly confluent, only a narrow cleft dividing the masal ends of 4 



and 6. 

 Form connata Fitch. 



Spots, 1, 4+5+6 making one large patch. 



Form insulata Fitch. 



Spots, 1, 4+5+6 inclosing a small light spot. 



Form nimia Fitch. 



Spots 1, 3, 4+5+6. Fitch reports 3 in 40 cases. At Stony Lake, Michigan, there 

 were 16 per cent in 657. 



Mulsant gives 2 varie- 

 ties characterized by loss 

 of some spots, but I at- 

 tribute these to Hippoda- 

 mia apicalis, where the 

 tendency to reduction in 

 a part of its range is 

 strong. 



Subspecies of the East- 

 ern States: Characterized 

 by a large percentage of 

 forms confluenta, insu- 

 lata, and connata. 



Subspecies of Oregon : 4 . 2< 

 The black pattern upon 

 the pronotum, instead of 

 being only slightly wavy 

 cephalad, has the mesal 

 element strongly project- 

 ing on account of the re- 

 duction of pigment be- 

 tween it and the lateral 

 element. 



Although this species is so widespread, it seems less closely allied to the 

 European members of its subgenus than the much more locally distributed 

 species H. apicalis and H. lengi. 



41 



mmmm 



FIG. 40. Variation in elytral pattern of H. parenthesis, b = mode; 

 all from Stony Lake, Michigan. 



FIG. 41. Variation of color-pattern ol head of H. apicalis a, b, 

 from Colorado. Variation of color-pattern of head of H . par- 

 enthesis. c = mqde; c, d, from Stony Lake, Michigan; e, from 

 Toronto, Ontario. 



FIG. 42. Variation of pronotal pattern of If .parenthesis, c = mode; 

 to e, from Dilley, Oregon; ftoj, from Stony Lake, Michigan. 



