56 Rowland M. Shelley 



anterior margin. Prefemoral process short and subtriangular, cuneate. 

 Acropodite thick and heavy, curving into peak and terminating abruptly 

 at distal extremity of peak; distal zone and apical curve absent; peak 

 overhanging and extending usually beyond level of prefemoral process, 

 directed subperpendicularly to basal zone; basal zone long, usually 

 about 2/3 of acropodite length, with or without broad, caudally directed 

 spine basally on ventral margin; anterior bend variable, broad and 

 poorly defined to sharp and well defined; peak flattened to slightly 

 curved, relatively short, no more than 1/3 of acropodite length; distal 

 extremity of peak (termination of acropodite) variable — blunt, slightly 

 rounded, or indented with hood-like lobe overhanging basal projection. 

 Medial flange usually present, occasionally reduced and vestigial, aris- 

 ing on basal zone distal to spine, extending beyond anterior bend and 

 terminating on peak, margin irregular. Peak with or without sharply 

 acute spur on medial face distal to flange. Prostatic groove running 

 along medial face of basal zone, crossing to lateral side at anterior bend, 

 terminating on inner corner of basal projection of peak. 



Remarks. — The specimens from Oconee County are now referred to 

 arcuatus, as mentioned in the ensuing account. Otherwise, the range of 

 shelfordi, as represented by the available material, remains unchanged 

 from 1980. 



Since it is now apparent that the medial flange is homologous to 

 that of Sigmoria, the question arises as to whether the spur might be 

 homologous to the tooth of latior and other species of Sigmoria. This 

 seems plausible, but the material at hand provides no clues to resolve 

 the issue. 



As mentioned, the acropodite of shelfordi is merely an extremely 

 shortened one in which the distal zone and apical curve are absent. 

 Given the preponderance of long, curved acropodites in the tribe Aphe- 

 loriini, such an abbreviated structure can only be interpreted as a 

 derived character. 



Brevigonus arcuatus, new species 

 Figs. 1-5 



Type specimens. — Male holotype (NCSM A2075) and 4 M and 2 F 

 paratypes collected by R. M. Shelley and W. B. Jones, 12 June 1978, 

 from Pickens Co., SC, 13.6 km (8.5 mi.) E Pickens, along SC highway 

 192 at George's Creek. Three M and 2 F, and 7 M and 1 F, paratypes 

 collected at same locality by R. M. Shelley on 8 May 1977 and 2 August 

 1977, respectively. Male and female paratypes deposited in Florida 

 State Collection of Arthropods and private collection of R. L. Hoffman. 



Diagnosis.— Characterized by following features of male gonopods: 

 in situ arrangement parallel; prefemoral process absent; acropodite 

 long, curving distally into broad arch, apical curve and distal zone pres- 

 ent, without spur on peak; tip of distal zone variable, simple or reflexed. 



