474 PEiOOEEIDilNGS OF THE NATIONAL MUSEUM vol. g4 



as hooks to insure the period of sexual union. The secondary right 

 tergal process (10 RPo) forms a dorsal flap over the anal opening and 

 the process of the ninth sternite (HP) a ventral support of the anus. 



An examination of the terminalia of a penultimate instar male 

 just before the last ecdysis reveals the inner lobe of the structure, here 

 regarded as the left cercus-basipodite, clearly forming within the 

 cuticle of the left cercus. It is thus likely that much of this structure 

 is derived directly from the basal segment of the left cercus. Per- 

 haps only a small fused basal part is actually of basipodital origin. 



OLIGEMBIA (TOLIGEMBIA) ROSSI Davis 



OligemMa rossi Davis, 1939b, p. 219, figs. 6-12. 



Holotype. — Male, on two slides, British Museum of Natural History. 

 Ty'pe data. — Barro Colorado Island, Panama Canal Zone (W. INI. 

 Wheeler). 



GROUP II 



OLIGEMBIA (OLIGEMBIA) ARMATA, new species 



Figures 121-126 



Male (on slide). — Body, legs, and wings tan; head and mandibles 

 reddish brown; submentum orange; antennae chocolate brown. 

 Length 5.4 mm. ; f orewing length 3.5 mm., breath 0.85 mm. 



Head (fig. 121) with eyes large, inflated, strongly convex, facets very 

 large ; eyes separated by a space one-third wider than an eye width ; 

 sides behind eyes longer than an eye length, subparallel for a short 

 distance, thence gradually rounded and convergent, joining the evenly 

 arcuate caudal margin. Mandibles with apical dentations small, blunt. 

 Gular bridge very broad, slightly longer than an eye width. 



Wings similar to those of peru/oiana. 



Terminalia (figs. 122, 123) with tenth tergite extensively produced 

 forward beneath ninth tergite as an acute lobe nearly attaining basal 

 margin of the ninth tergite. Left tergal process (10 LP) very long, 

 sinuous, sclerotic, outer edge twisted downward, extending toward left 

 at 45° and overlapping left cercus-basipodite; tip broadened, com- 

 plex turned on edge (detail therefore not discernible from above). 

 Eight tergal process (10 RPi) elongate, parallel to 10 LP and only 

 slightly longer; tip curved caudad; bearing at inner basal margin a 

 j>rominent, large, echinulate, rounded tubercle which is borne par- 

 tially by the broadly sclerotized secondary right tergal process (10 

 EPo). Left paraproct (LPPT) greatly developed caudally as an 

 elongate sclerotized plate nearly as long as 10 EPi, which is fused 

 along inner basal half with the poorly developed process of the hypan- 

 drium (HP). Left cercus-basipodite (LCB) large, bearing a stout, 



