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[Vol. 92 
far apart as wide, except closer in female simulator 15 
14. S-II spots 0.5 or less as far apart as wide, T-III margin between 
lateral tooth and base strongly convex lynchi (Brethes) 
S-II spots as far apart as wide or further apart, T-III margin 
between lateral tooth and base nearly straight or only slightly 
convex lagopus (Buysson) 
15. Face without clearly defined carinae on brow 16 
Face with clearly defined transverse, and in simulator , vertical 
carinae on brow 17 
16. Malar space less than 0.5 MOD long and shorter than suban- 
tennal distance; male flagellum yellowish and broadly flattened, 
F-II as long as wide; male basitarsus dilated 
ameghinoi (Brethes) 
Malar space and subantennal distance equal and both more 
than 0.5 MOD long; male flagellum reddish brown and cylin- 
drical, F-II length 1 .3 times width; male basitarsus unmodified 
fasciifera (Bischoff) 
17. Transverse frontal carina with 2 carinulae extending back 
around midocellus, male flagellum cylindrical and blackish . . . 
simulator Kimsey 
Transverse frontal carina linear or an inverted C-shape, without 
carinulae extending back toward midocellus; male flagellum 
flattened and yellowish 18 
18. T-III lateral margin concave, with a basal angle; male LID 
narrower than eye width sur Kimsey 
T-III lateral margin straight or somewhat convex, male LID as 
wide as or wider than eye width ancilla (Buysson) 
Pleurochrysis atacamae Kimsey, new species 
(Fig. 1). 
Holotype male. Body length 6.5 mm. Scapal basin with dense fine 
transverse ridges (fig. 1), outer two-fifths with dense silvery setae; 
brow with strong transverse carina; malar space 1 MOD long; least 
interocular distance 0.8 times eye width; subantennal distance 1 .5 
MOD long; F-1 2.4 times as long as wide; F-II 1.5 times; F-III and V 
as long as wide; pronotum rounded, without medial projection; R1 
as long as stigma; S-II spots small and circular, about as far apart as 
wide; Abdominal segments coarsely punctate, punctures as large as 
those on thorax and nearly touching; T-II with low impunctate 
