Figures 12-36 



12-29. Right accessory claspers of males, all drawn to the same scale from 

 males with wingspread of 25-27 mm., except figures 27-29 (27 was 31 mm., 

 28 was 28 mm., 29 was 21 mm.). The left accessory claspers are similar. There 

 is considerable variability in the accessory claspers of a species or even sub- 

 species. For example, some specimens of M. tigris may have evenly tapered 

 prongs rather than the more common jagged type (fig. 14). Note, however, 

 the great overall similarity between figures 16-26 (the closely related species 

 M. incurvum and M. calijornicum) and figures 27-29 (Palearctic species) when 

 compared with figures 12, 13, 14, and 15 (other distinct North American 

 species). See also figures 37-54 and 57-74 for a comparison of other genitalic 

 structures from the same specimens. 



12. M. dis stria. 



13. M. cotistridum constrictum. 



14. M. tigris. 



15. M. americanum. 



16. M. incurvum incurvum. 



17. M. incurvum discolor atum. 



18. M. incurvum aztecum. 



19. M. calijornicum calijornicum. 



20. A/, calijornicum ambisimile. 



21. A{. calijornicum recenseo. 



22. M. calijornicum pluviale, Seattle, Washington. 



23. M. calijornicum pluviale, Alberta (bog population). 



24. M. calijornicum lutescens, Saskatchewan. 



25. AI. calijornicum lutescens, Oklahoma. 



26. AI. calijornicum Jragile. 



27. AI. neustrium. 



28. AI. castrensis. 



29. AI. Jranconicum. 



30. Male terminalia, AI. americanum, ventral aspect, showing the relation- 

 ships of the individual structures. 



31-36. Male genitalia, lateral aspect, all drawn to the same scale from 

 males with a wingspread of 25-27 mm. The very lightly sclerotized and 

 membranous areas which connect the parts are not shown. 



31. AI. americanum. 



32. AI. tigris. 



33. AI. disstria. 



34. Ai. constrictum. 



35. AI. incurvum. 



36. AI. calijornicum. 



Note the large size of americanum compared with incurvum and calijornicum, 

 and the small size of disstria compared with the others. 



213 



