INSECUTOR INSCITI^ MENSTRUUS 79 



P>2. Filament of harpago angularly expanded at basal third, 



sansoni Dyar and Knab 

 Filament of harpago angularly expanded beyond middle, 



increpitus Dyar 



33. Basal lobe highly conical, setose on basal aspect ; filament with a 



broad knife-blade expansion riparius Dyar and Knab 



Basal lobe low-conical, a stout seta on inner margin ; filament 

 small, sickle-shaped 34 



34. Spines of basal appendages long palustris Dyar 



Spines of basal appendages moderate mimesis Dyar 



35. Basal lobe large with two stout spines 36 



Basal lobe small with two stout spines pullatus Coquillett 



Basal lobe absent ; no basal spines aurifer Coquillett 



36. A slight hairy area distal of apical lobe impiger Walker 



A strong hairy area proximal of apical lobe, 



diantaeus Howard, Dyar and Knab 



37. Harpago rather long; filament sickle-shaped with double dorsal 



membranous ridge iiinuifics Dyar and Knab 



Harpago long, the filament bud-shaped trichurus Dyar 



Harpago short, branched ; filament sack-shaped, 



thibaulti Dyar and Knab 



38. Basal lobe small with long setae 39 



Basal lobe undeveloped 43 



Group HI (Taeniorhynchus Arribalzaga) 



39. Filament of harpago with central retrose spine, 



cpinolus Dyar and Knab, taeniorhynchus Wiedemann, niger Giles 

 Filament of harpago without such spine 40 



40. Side piece short ; basal lobe with a secondary area of short setae 



beside it varipalpns Coquillett 



Side piece moderate ; basal lobe small, unmodified 41 



41. Harpago short, the filament longer than it 42 



Harpago longer, the filament shorter nigromaculis Ludlow 



Harpago distinctly long, the filament much shorter, 



atropalpus Coquillett, epactius Dyar and Knab 



42. Filament much longer than harpago fluviatilis Lutz 



Filament slightly longer than harpago, 



sollicitans Walker, mitchellce Dyar 



Group H (Gualteria Lutz) 



43. An articulated spine at base of side piece. . .mediovittata Coquillett 

 Without this structure at base of side piece 44 



44. A hair-tuft at middle of side piece triseriatus Say 



Without this structure 45 



