420 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



Abdomen on dorsal aspect slender and almost parallel-sided to base 

 of fourth segment. Fourth segment expanding apically, apical half 

 forming part of bulbosity. Fifth segment the widest, with sub- 

 angulate, ridged very slightly produced elevation on apical two- 

 thirds close to lateral margins. Sixth segment forming part of 

 bulbosity, slightly shorter than fifth, narrower apically. Seventh 

 tergum slightly narrower apically than basally, slightly shorter than 

 sixth, apical margin very shallowly concave, apical angles slightly 

 rounded, with a small inconspicuous median projection (fig. 107). 

 Eighth tergum basally slightly over twice as wide as long, one-half 

 times as long as ninth, corrugated. Ninth tergum corrugated on basal 

 half; apical half narrower, lateral margins depressed, making it more 

 convex than basal half, shiny, apical margin concave (fig. 124). 

 Hind margin of sixth sternum U-shaped, longer on lateral margins 

 than medially. Seventh sternum slightly over twice as long as sixth, 

 apical margin broadly produced medially (fig. 50). 



Overall body length 25.0 mm. 



This species is close to approximata but can be easily separated from 

 it by the characters in the key and also by having the bulbosity longer 

 than wide, while this character is shorter in approximata. 0. pendula 

 and gladiator also have the bulbosity longer than wide but otherwise 

 they are very different from clavellata. 



Types: Holotype, female, Kaieteur, British Guiana, July 28, 1911, 

 AMNH. Paratypes, two females, same locality, collected August 10, 

 and July 26, 1911, in author's collection and AMNH. 



Ghilianellafene strata, new species 



Figures 25, 33, 82 



Male: Head, thorax, and forelegs dark reddish brown. Beak and 

 antenna reddish brown. Forefemur reddish brown, with three incon- 

 spicuous lighter spots on inner side, spines of armature of femur 

 brownish, those of outer row fading to yellowish toward apex. Middle 

 and hind femora reddish brown, each with two yellowish annuli on 

 apical half. Middle and hind tibiae each with inconspicuous basal 

 3^ellowish band. Abdomen blackish brown, irregularly mottled with 

 yellowish brown. 



Figures 124-146. — 124, Ghilianella calvellata, female, apex of abdomen from behind. 125, 

 G. subglobulata, same. 126, G. obesa, same. 127, G. puncticauda, same. 128, G. atabapo, 

 same. 129, G. approximata, same. 130, G. glabrata, same. 131, G. cuneata, same. 

 132, G. productilis, same. 133, G. pendula, same. 134, G. aracataca, same. 135, G. 

 minimula, same. 136, G. globulata, same. 137, G. gladiator, same. 138, G. varicornis, 

 same. 139, G. monetise, same. 140, G. signoreti, same. 141, G. grapta, same. 142, 

 G. annectens, same. 143, G. bicaudata, same. 144, G. succinta, same. 145, G. personata, 

 6ame. 146, G. bethei. same. 



