280 
Psyche 
[Vol. 92 
cellus in fasciifera and leucophris. The pronotum has an irregular 
lateral carina in postica and alfkeni but not in the other species. One 
species, alfkeni , has a medial propodeal tooth, which is particularly 
well-developed in some individuals. S-IV is generally narrow and 
fringelike in male Pleurochrysis (as in fig. 10), except in cavifrons, 
bruchi, leucophris and uruguayensis , where it is large and usually 
metallic green as in Ipsiura (fig. 12). A few species have a metanotal 
projection. Two characteristics are unique in this genus, but unfor- 
tunately do not occur in all species. The first is the presence of a 
small lateral tooth on the pronotum as seen in dorsal view (fig. 3). 
Second, a number of males have highly modified antennae. The 
most extreme case can be seen in bruchi where the flagellomeres are 
strongly flattened and flabellate. Typically, though, the male flagel- 
lum is yellowish and somewhat flattened. Finally, there is little sex- 
ual dimorphism in the spots on sternum II, in most species these 
spots are round and about as far apart as wide in both sexes. Only 
one species, bruchi , has six apical teeth on T-III, the rest have four. 
Included Species: acuta (Brethes) 1908, alfkeni (Ducke) 1902*, 
ameghinoi (Brethes) 1903, ancilla (Buysson) 1898, atacamae Kimsey 
new species, bruchi (Brethes) 1902, cavifrons (Brulle) 1846, char - 
ruana (Brethes) 1903, chilicola (Mocsary) 1914 .fasciifera (Bischoff) 
1910, imbecilla (Mocsary) 1889 new comb., lagopus (Buysson) 1891 
new comb., leucophris (Mocsary) 1889 new comb., lynchi (Brethes) 
1903 .postica (Brulle) 1846, simulator Kimsey new species, sur Kim- 
sey new species, uruguayensis Kimsey 1985 new species, ypirangen- 
sis (Buysson) 1904. 
Key to the Species of Pleurochrysis 
1. T-III with six apical teeth, male flagellum unusually flattened 
and basal segments flabellate bruchi (Brethes) 
T-III with four apical teeth, male flagellum variously shaped 
but not flabellate 2 
2. Pronotum with lateral tooth 3 
Pronotum without lateral tooth 8 
3. T-III pre-pit swelling large usually obscuring pits, LID 0.6 times 
eye width, R1 0.2-0.3 times stigmal length alfkeni (Ducke) 
T-III prepit swelling usually small or absent but never obscur- 
ing pits, pits large and clearly defined; LID 0.8 times eye width 
or wider; R1 0.9 or more times as long as stigmal length 4 
