78 INSECUTOR INSCITI^ MENSTRUUS 



17. Apical lobe almost bare, with few setae, 



squamiger Coquillett, grossbecki Dyar and Knab' 

 Apical lobe setose IS 



18. Filament of harpago angularly expanded near base 19 



Filament of harpago fusiform, without expansion 21 



19. Spine of basal lobe stout, exceeding the accompanying tuft. 20 



This spine weak, not exceeding the tuft, 



hirsuteron Theobald, aestivalis Dyar 



20. Spine and tuft weak, indistinct aldrichi Dyar and Knab 



Spine and tuft strong spencerii Theobald, idahoensis Theobald 



21. Apical lobe with the setae curved and more or less appressed 22 



Apical lobe with the setae unmodified, 



abserratiis Felt and Young, auroides Felt 



22. Side piece not modified at base hexodontus Dyar 



Base of side piece strongly chitinized, the tubercles forming trans- 

 parent dots aboriginis Dyar 



23. Apical lobe weakly and sparsely setose 24 



Apical lobe more strongly setose 25 



24. Basal lobe conical with many fine setae prodotes Dyar 



Basal lobe small with few coarse setx. .lasarensis Felt and Young 



25. Filament of harpago with double angular basal membrane; spine 



of basal lobe situated distally taho'cnsis Dyar, altiusculus Dyar 



Not so formed 26 



26. Filament of harpago sickle-shaped cantafor Coquillett 



Filament of harpago expanded or notched 27 



27. Basal lobe of side piece conical, concrete 28 



Basal lobe expanded, diffused outward 29 



28. Filament of harpago large, triangularly expanded near base, 



bimacnlatns Coquillett 

 Filament sickle-shaped, notched at base fitchii Felt 



29. Harpago stout; filament angularly expanded near base, 



fletchcri Coquillett 

 Harpago slender ; filament angularly expanded near middle. 



stimulans Walker 



30. Ba.sal lobe flat 31 



Basal lobe conical, concrete 33 



31. A long rugose-papillose area reaching up nearly to apical lobe, 



abfitchii Felt and Young* 

 Basal lobe tubercular and diffused, not forming a rugose area... 32 



hairs lost in the finished mount, hut one single one was observed during prepara- 

 tion. 



' Doubtfully placed in the absence of a slide. 



-A. eiicdes Howard, Dyar and Knab. is a synonym of abfitchii. 



