800 N. C. AGR. EXP. STA. BUL. 239 
Color much as in W. rostris, n. sp., but with an arcuate black line on each 
side on crown and a median scutellar black spot; face and katepisternum of 
mesothorax pale. 
Holotype male, Salud, Panama, August 20, 1952 (F. S. Blanton); four 
males, ‘‘Far Fam.”, Panama Canal Zone, December 21, 1956 (F. S. Blanton); 
one male Galeta Point, Panama, December 14, 1956 (F. S. Blanton). 
(USNM). 
N. pretensa, n. sp., is very similar to N. praestigia but differs in its shorter 
ventral aedeagal process, the much more strongly curved aedeagal shaft, and 
in the heavily sclerotized dorsal pygofer process. 
Nielsonia praestigia, NEW SPECIES 
FiGuRE 646, PAGE 799 
Length of male 8.4-8.9 mm, of female 8.4-9.2 mm. Head with median 
length of crown varying from six-tenths to two-thirds interocular width and 
from one-third to slightly more than four-tenths transocular width. Male 
pygofer with posterior margin convex, with dorsal unsclerotized process as in 
N. rostris, n. sp., with an arcuate vertical sclerotized rod on internal surface of 
cuticula extending subparallel to posterior pygofer margin; aedeagus with 
base of shaft closely associated with base of ventral process, shaft not as 
strongly curved as in rostris, ventral process extending dorsally parallel to 
shaft, narrowed in its basal half and not bearing a smaller process, atrium 
bearing a pair of short curved processes directed ventrad from its lower por- 
tion. Female genitalia as in generic description. 
Color much as in WN. rostris but with face more variable, usually less 
darkened than in rostris, often with only a portion of middle of clypeus dark, 
rarely with only two spots at apex of clypellus and lateral clypeal sutures 
black. 
Holotype and seven additional males and one female, Cerro Campana, Pan- 
ama Province, Panama, September 19, 1952 (F. S. Blanton); 15 males, Mad- 
den Dam, Panama Canal Zone, September 19, 1952 (F. S. Blanton); one 
female, same data as preceding except date, April 28, 1952; six males, Cerro 
Azul, Panama, October 3, 1952 (F. S. Blanton); one male, Campinas, Pan- 
ama, September 19, 1952 (F. S. Blanton); one male, Ft. Sherman, Panama 
Canal Zone; one male, Ft. Davis, Panama Canal Zone, August 28, 1952 (F. 
S. Blanton); one female, Pacora, Panama, November 4, 1945 (H. H. Stage); 
one male Loma Borracha, Canal Zone, July 2, 1952 (F. S. Blanton) (USNM). 
Twenty-three males and two females, Chica, Panama Province, Panama, June 
12, 1967 (D. M. DeLong and C. A. Triplehorn) (OSU). 
N. praestigia, n. sp., is closer to NV. pretensa, n. sp., than to other species in 
the genus, in the structure of the male genitalia. N. praestigia may be 
separated from pretensa by the basiventral processes of the aedeagus, which do 
not occur in the latter species. 
