796 N. C. AGR. EXP. STA. BUL. 239 
N. rostris, n. sp., has been collected on coffee (see below). 
Nielsonia is named in honor of M. W. Nielson, who has contributed much to 
our knowledge of leafhopper systematics. 
SPECIES OF NIELSONIA 
praestigia, n. sp. Panama. 
pretensa, n. sp. Panama. 
rostris, n. sp. Costa Rica. 
scissa, n. sp. Panama, Ecuador. 
KEY TO MALES OF MNIELSONIA 
1. Ventral aedeagal process with a smaller process near midlength ......... 2 
Ventral aedeagal process without a smaller process .........-..-+++++++5 a 
2. Smaller aedeagal process retrorse; larger process more strongly curved 
(fig. 643f,). erase gibi new uselde niles seeing <i pa rostris, N. sp. 
Smaller aedeagal process not retrorse; larger process less strongly curved 
(fig: :644f.)wwsinitoise daemreret «teen eet «aan scissa, N. sp., page 798 
3. Aedeagal shaft strongly curved, its ventral process not extending to its 
9 oy, da a is RL NBs pretensa, n. sp., page 798 
Aedeagal shaft less strongly curved, its ventral process extending to or 
near Sapa ONC: VALLI Ae oe eee praestigia, n. sp., page 800 
Nielsonia rostris, NEW SPECIES 
FIGURE 643, PAGE 797 
Length of male 9.6-10.6 mm, of female 10.0 mm. Head with median length 
of crown varying from slightly more than one-half to almost two-thirds inter- 
ocular width and from one-third to slightly more than four-tenths transocular 
width. Male pygofer with posterior margin very slightly concave below apex, 
with a short dorsal unsclerotized process directed posteriorly but not attaining 
apex of pygofer; connective short Y-shaped; aedeagus with shaft well 
separated basally from ventral process which arises from ventral portion of 
atrium, curves dorsally close to shaft in lateral view, its apical half acuminate, 
and bears a short retrorse acute smaller process at its midlength. Female 
genitalia as in generic description. 
Color of crown except at apex, anterior portion of pronotum, and 
scutellum, dull yellow, apex of crown either contrasting pale yellow, or black, 
posterior two-thirds of pronotum tan or purplish; with a pair of angulate 
black spots or a pair of arcs on crown at upper margin of muscle impressions, 
often connected across median line by a black line; a pair of round black 
spots on disk of pronotum before its midlength; a pair of subangular black 
spots on base of scutellum and a black spot before its apex; clypeus entirely 
and often clypellus entirely or partly castaneous suffused with black to a vary- 
ing degree; thoracic pleura dull yellow to tan except lower portion of meso- 
thoracic anepisternum and all of katepisternum which are dark brown to 
black, metepisternum black; legs tan. 
