240 LEAF-MINING INSECTS 



12. Puparium formed in mine, bulging from lower side of leaf 



Agromyza curvipalpis 

 Larva abandoning mine to transform 13 



13. Mine white; no definite arrangement of frass, which is scattered in 



small spots; mine conspicuously tortuous, slightly visible from lower 

 6ide of leaf; puparium usually attached to surface of leaf adjacent to 



exit hole Phytomyza aquilegiae 



Mine green or brown, not so tortuous as preceding; a double frass line 



14 



14. Mine green, with pale white edges ; occurring on Cornus circinata 



An undescribed species 



Mine brown, without pale edges; occurring on raspberry, strawberry, 



and blackberry Agromyza fragariae 



15. Script-like tracings preceding blotch part of mine. .Agromyza borealis 

 No script-like tracings 16 



16. Mine occurring on Ulmus americana Agromyza ulmi 



Mine occurring on Philadelphus grandiflorus Agromyza melampyga 



17. Mine digitate; frass in spots at edge of mine Scaptomyza adusla 



Mine a simple blotch 18 



18. Mine large, messy, covering nearly the entire leaf 19 



Mine smaller, covering only a small part of the leaf 21 



19. Frass in small spots scattered about mine; mine occurring on parsnip 



and on Cryptotaenia canadensis Acidia heraclei 



Frass soft, scattered about mine irregularly 20 



20. Mine occurring on Rumex Pegomyia calyptrata, vanduzeei, 



bicolor, winthemi 



Mine occurring on Chenopodiaceae Pegomyia hyoscyami, 



Hylemyia fugax 



21. Mine very small; puparium fastened within mine by a pellet of frass; 



occurring on Aster and Solidago. .Agromyza platyptera var. coronata 

 Mine larger; puparium not fastened within mine as described above. 22 



22. A distinct white area around edge of mine ; frass deposited in center of 



mine; occurring on Thalictrum poly gamum. . .Phytomyza plumiseta 

 No white area about edge of mine 23 



23. Mine showing distinct etchings in the form of semicircular cuts made 



by mouth hooks of larva 24 



Mine without such etchings 25 



24. Mine occurring on Helianthus annuus and Urtica gracilis, 



Agromyza reptans var. subnigripes 

 Mine occurring on Aster and Solidago Agromyza posticata 



25. Mine on underside of leaf, occurring on Bidens, Arctium, and Eupa- 



torium Agromyza allecta 



Mine on upper side of leaf, occurring on Camptosorus rhizophyllus 



Agromyza felti 



