482 FROCEEIDINGS OF THE NATIONIAL MUSEUM vol. 94 



Fern ale. — Unknown. 



Eolotype.— Mule, on slide (U.S.N.M. No. 56762). 



Type data.— Collected at light, Vergel, Chiapas, Mexico, May 20, 

 1935 (A. Dampf). 



The holotype specimen has the right processes of the tenth tergite 

 slightly dislocated owing to mounting technique. These structures 

 are shown in their normal position in the figures of the other species 

 of the subgenus. 



OLIGEMBIA (DILOBOCERCA) EXCISA, new species 



Figures 139-141 



Male. — Color (in alcohol) : Head dark chocolate brown, basal pat- 

 tern obsolete; eyes almost black; antennae with basal segment dark 

 brown, other segments much lighter brown to tan. Thorax with 

 sclerotized portions light brown, membranous areas pale. Wings 

 faintly pigmented, tan. Forelegs light brown, middle legs and hind- 

 legs light tan. Abdomen with all segments light tan except ninth 

 sternite and tenth tergite which are brown; basal segments of cerci 

 brown, terminal segments light tan. Length 5 mm. ; f orewing length 

 4.7 mm., breadth 1.2 mm. 



Head (fig. 139) larger than terminalia, elongate; sides behind eyes 

 strongly caudally convergent, nearly straight, narrowly rounded 

 posteriorly. Eyes very large, strongly inflated, extending mesad one- 

 third of width of head through eyes ; inner margins irregularly, ob- 

 tusely angulate; facets prominent. Antennae incomplete; maximum 

 number of segments present, 16. 



Wings much as in hrevicauda but slenderer and with R4+5 forking 

 well within basal half in both wings. 



Terminalia (figs. 140, 141) : Tenth tergite (10) produced forward 

 beneath ninth tergite and terminating at its basal margin, not pro- 

 duced on right basal half. Left tergal process (10 LP) broad basally, 

 continuous with tenth tergite; divided terminally, forming two dis- 

 similar projections : the outer broad, quadrate, with apical margin to 

 left of middle produced as a small sharp point; the inner projection 

 narrow, very acutely pointed, talonlike, evenly curved toward basal 

 segment of left cercus. Right tergal process (10 RPi) fleshy, 

 V-shaped, abruptly curved inward on outer margin. Ninth sternite 

 (H) broad, quadrate; produced caudad as submedial, broad, truncate 

 process (HP). Left paraproct (LPPT) loosely fused to right side 

 of HP, longitudinal, emarginated on outer side and acutely pointed 

 terminally. Left cercus-basipodite (LCB) with a short, inner, basal 

 clawlike process, the "claws" arising almost without a basal projection ; 

 terminal to these, a short, blunt, sclerotic process is present ; area be- 



