508 N. C. AGR. EXP. STA. BUL. 239 
is very narrow, acute, and extending at a right angle to axis of shank; connec- 
tive Y-shaped with arms very widely divergent; aedeagus slender, arched ven- 
trally, the apex curved very slightly dorsally, without processes; paraphyses 
absent. Female unknown. 
Crown, pronotum, and scutellum dull orange, with a constricted median 
line and a spot bordering inner margin of each eye on crown, a median and a 
pair of lateral basal triangular spots on scutellum, black, the scutellar spots 
sometimes (type) indistinct; forewing translucent yellowish-brown; face black, 
clypeus pale beneath antennae; propleura yellow marked with black; legs 
yellow. 
Holotype male and two additional males, Itaituba, Brazil (USNM). One 
male, “‘Peru””> (MMB). 
M. ttaitubana, n. sp., is related to M. cardinula (Osborn), but it may be 
separated from the latter and from all other species in the genus by the form 
of the apical portion of the style. 
Mesogonia monsonensis, NEW SPECIES 
Figure 419, pace 509 
Length of male 7.3-7.5 mm. Head with median length of crown less than 
six-tenths interocular width and slightly less than one-third transocular width, 
anterior margin subangulate to angular in dorsal view, ocelli located on a line 
between anterior eye angles and each closer to median line of crown than to 
adjacent anterior eye angle, crown with a shallow concavity arising between 
ocelli, extending anteriorly and broadening behind apical carina; clypeus 
slightly convex medially, muscle impressions distinct; face pubescent beneath. 
Thorax with dorsopleural carina extending anteriorly to eye margin. Fore- 
wings coriaceous with veins partly distinct. Other external structural charac- 
ters as in M. retrorsa, n. sp. (p. 489). 
Male pygofer well produced, dorsoapical margin subangularly rounded, 
with macrosetae above posteroventral margin and anteapically, pygofer 
without processes; plates not extending as far posteriorly as pygofer apex, 
each with a dorsal lobe in basal half in lateral view, in ventral view gradually 
tapered from base to apex, without macrosetae except on dorsal lobe; style ex- 
tending posteriorly much farther than apex of connective, without preapical 
lobe, abruptly narrowed in basal half, the apical half narrow and crescenti- 
form, acute at apex; connective semi-oval in shape; aedeagus in lateral view 
arched slightly ventrally with apex curved slightly dorsally, without processes; 
paraphyses absent. Female unknown. 
Crown, pronotum, and scutellum black, with a trilobate yellow transverse 
marking on pronotum (occasionally (holotype) with median lobe obscured by 
black color from beneath); forewing dark gray with a small yellow spot near 
base, with some parts of longitudinal veins black, with a dull orange sub- 
marginal stripe along costa as far as apex of clavus; face black with few spots 
on clypeus, part of area between muscle impressions, apex of clypellus, loral 
and genal margins, yellow; propleura yellow marked with black; legs yellow. 
