EJVEBIOPTERA OF THE NEW WORI^D — ROSSi 485 



OLIGEMBIA (DILOBOCERCA) GIGANTEA, new species 



Plate 19A ; Figubes 145-147 



Male. — Color (on slide) : Body and legs light brown, wings lighter; 

 head medium brown ; mandibles reddish brown ; basal two, and termi- 

 nal, antennal segments brown, segments 3 to 5 straw yellow. Length 

 8 mm. ; forewing length 5.8 mm., breadth 1.5 mm. 



Head (fig, 145) with eyes moderately large, strongly inflated, convex, 

 separated by a space one and one-half eye widths wide; facets mod- 

 erately prominent. Head elongated behind eyes, sides nearly straight, 

 convergent; caudal margin gradually rounded laterally, rather 

 abruptly rounded medially. Mandibles with small, blunt, apical teeth ; 

 inner median points prominent, lying just before deep emarginations. 



Wings (fig, 3) well pigmented. Five cross veins present between 

 Ra and R2+3 ii^ forewing and six inconspicuous ones located apically 

 between costal margin and Ei ; hindwing with similar number but lo- 

 cated more toward base and more widely spaced. Hyaline lines rather 

 sharply defined. 



Terminalia (figs. 146, 147) with basal projection of tenth tergite (10) 

 reaching beneath ninth tergite (9) to the basal margin; apex of pro- 

 jection evenly rounded. Left tergal process (10 LP) broad, deeply 

 cleft apically, the outer lobe short, spatuliform, the inner lobe slender, 

 evenly, outwardly arcuate, talonlike. Right tergal process (10 RPi) 

 with extreme apex blunt. Ninth sternite (H) with process (HP) 

 well pigmented, broad, truncate, half as long as 10 RPi. Left para- 

 proct (LPPT) conspicuous, fused along inner margin with HP and of 

 equal length. Left cercus-basipodite (LCB) well sclerotized, without 

 membranous areas; inner projection bilobed, the large ventral lobe, 

 gradually tapered, rounded apically, the dorsal projection slender, 

 evenly curved, apically cleft, forming two nearly fused "claws" with a 

 small, rounded, inner lobe present at its base. Basal segment of left 

 cercus (LCi) continuous with LCB; bearing a prominent, rounded, 

 apical, inner lobe. Basal segment of right cercus with basal foramen 

 complexly, irregularly outlined ; inner margin emarginated and lobed 

 apically, strongly pigmented. Terminal segments of both cerci equal, 

 slender, cylindrical. 



Female. — Unknown. 



Holotijpe.— Winged male, on slide, U.S,N.M. No. 56051. 



Type data.— ^^With wild Gattleya from Caracas, Venezuela," col- 

 lected in plant quarantine at Washington, D, C,, May 31, 1939 

 (Adams), 



Pam^^ype.— Male, on slide, with type data but collected on May 4, 

 1 939 ; deposited in writer's collection. 



