904 N. C. AGR. EXP. STA. BUL. 239 
teeth sparse and rounded near base, angular more distally, each with a num- 
ber of small denticles, apex acute, with a number of dorsal and ventral an- 
teapical denticulations (from female of type-species). 
Both of the known species of Plummerella were collected on grasses, at 
altitudes of 7,500 ft. (P. lineata DeLong) and 10,000 ft. (P. alpina DeLong), in 
the mountains near Mexico City and in Michoacan. 
Plummerella DeLong belongs to the Graphocephala generic group (p. 849). The 
females (of alpina DeLong) have the pygofer and the abdominal sternum VII 
similar to most of the species in the complex, but the toothed area of the 
second valvulae is greatly reduced. The male genitalia do not have characters 
of diagnostic use at generic level. The elongate head and the occurrence of 
lenticular impressions of the median portion of the clypeus will serve to 
separate Plummerella from other genera of the group. 
My interpretation of both species of Plummerella is based on a very few 
specimens, the holotype of lineata DeLong, a pair of paratypes of alpina 
DeLong, and a series of six specimens of the latter collected at Rio Frio, D. 
F., Mexico, the type-locality, in the DeLong collection (OSU). 
SPECIES OF PLUMMERELLA 
alpina DeLong, 1942b:200. Mexico. 
lineata DeLong, 1944b:68. Mexico. 
KEY TO MALES OF PLUMMERELLA 
Paraphyses more elongate, aedeagus without processes 
alpina DeLong (fig. 733) 
Paraphyses much more slender, aedeagus with five spines arranged in a cir- 
cle near midlength-ofsshakt. .).asunhs a a eee lineata DeLong (fig. 734) 
124. NALTACA, NEw GENUS 
FigurE 735 
Type-species: Naltaca eremica, n. sp. 
Length of male 8.1-8.7 mm. 
Head very strongly produced and with anterior margin narrowly rounded 
in dorsal view, median length of crown equal to or slightly greater than in- 
terocular width and from two-thirds to almost three-fourths transocular width, 
with a carina at median portion of transition from crown to face, ocelli 
located before a line between anterior eye angles, each closer to adjacent an- 
terior eye angle than to median line of crown, surface of crown slightly convex 
from base to well beyond ocelli, flattened im’ approximately apical four-tenths 
of its length, the flattened portion limited posteriorly by a slight transverse 
elevation, surface rugulose and punctate, with some of the sculpturing in the 
form of lenticular impressions, lateral clypeal sutures not extending onto 
crown, median clypeal area without lenticular impressions; antennal ledges 
not protuberant, in lateral view with anterior margins almost vertical and 
slightly concave; clypeus concave in profile, muscle impressions distinct, trans- 
clypeal suture distinct, clypellus flattened, its surface in same plane as lora. 
