160 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 86 



KEY TO THE SPECIES OF THE SUBGENUS PHYTALUS 



MALES 



1. Hind tibiae with 1 spur free, tlie otlier fixed and immovable 2 



Both hind tibial spurs free, movable 4 



2. Upper tooth of claw longer to very much longer than lower 



one; antennae 9-segmented __ _ _ 3 



Upper tooth much shorter and narrower than lower tooth: 

 antennae 10-segmented sandersonia 



3. Yellow-testaceous; scutellum distinctly punctured only at sides; 



lower tooth of claw two-thirds or more as long as upper; 



fixed spur of hind tibia directly contiguous with tibial margui omani 



Rufotestaceous ; scutellum evenly punctured over entire surface ; 

 lower claw tooth shorter; not more than one-half as long as 

 upper; entire apical margin or posterior tibia distinct georgiana 



4. Fifth abdominal segment flattened at middle and coarsely 



punctate, not granulate; color reddish brown to piceous bilobatata 



Fifth abdominal segment lobate or with granular tumosities 5 



5. Upper tooth of claw much shorter than lower, claw very wide 



at base; fifth abdominal segment with a large triangularly 

 shaped lobe, the latter incised at apex and projecting back 



over sixth segment obsoleta vanalleri 



Upper tooth of claw much longer than lower, fifth abdominal 

 segment without a triangular lobe 6 



6. Lobe of fifth abdominal segment reaching to or beyond apical 



margin, granulate, faintly bilobed at apex ; pygidium coarsely 



rugose-punctate pallida 



Lobe of fifth abdominal segment less evident, the surface more 

 tumid, with transverse granules; pygidium smooth, sparsely 

 punctured 3o„ora 



FF.MALE8 



1. Pygidium with a distinct tubercle just above apex 2 



Pygidium without tubercle, plane or sometimes thickened api- 



cally _ 2 



2. Densely clothed above with short, erect, tawny hairs; thorax 



regularly and densely punctured, the punctures practically 



touching one another sandersonia 



Pronotum and elytra nearly or quite glabrous; thorax sparsely 

 punctured, the punctures separated by 2 to 4 times their di- 

 ameters obsoleta vanalleri 



3. LaXeral thoracic margins distinctly crenulate ; claws narrowly 



cleft, upper tooth longer than lower; front very closely, 



coarsely rugose-punctate pallida 



Lateral thoracic margins entire or nearly so 4 



4. Clypeus narrowly and deeply emarginate; color dark castaneous 



to rufopiceous bilobatata 



Clypeus broadly but not deeply emarginate; color testaceous or 

 rufotestaceous __ 5 



5. Last abdominal segment almost flat, slightly transversely sul- 



cata; pygidium densely or sparsely punctured (Eastern 



United States) _ 6 



