472 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95: 
middle of eyes, median carina present, obsolete apically; frons only 
a little longer than wide, strongly curved, lateral margins expanding 
to level of antennae, then incurved to suture, median carina percur- 
rent, lateral margins produced above genae; clypeus with a median 
carina and lateral margins carinate. Pronotum very short, not more 
than half length of vertex; mesonotum large, tricarinate, lateral 
carinae diverging posteriorly, tegulae rather large. Hind tibiae with 
one spine two-fifths from base. Tegmina with costal margin slightly 
recurved, a short Sc+R-+M stalk two-thirds as long as basal cell, 
Sc+R fork level with fork of ae shghtly distad of junction of 
claval veins, costal cell of almost satae width throughout. 
PLECTODERES COLLARIS (Fabricius) 
PLATE 13, FIGURES 336-343 
Flata collaris FABrictus, Systema rhyngotorum, p. 53, 1803. 
Female: Length, 4.38 mm.; tegmen, 6.0 mm. 
Vertex broader than long in middle (3 : 1); frons curved through 
100°; head, with eyes, about as wide as pronotum. Pronotum with 
median carina short, lateral carinae diverging to reach posterior mar- 
cin level with inner border of eyes. Tegmina with a row of six small 
cells, arising from Sc and R between stigma and apical angle, M with 
three branches reaching margin, Cu,, and Cu,» simple to apex, a series 
of six subapical cells, the first and sixth elongate, the third triangular, 
smaller than the remainder. 
Piceous; a narrow line inside each lateral margin of vertex, a nar- 
row border on basal margin of pronotum, a broad band across middle 
of clypeus, on genae below antennae, across lateral lobes of pronotum, 
covering base of procoxae, pleurites below tegmina, tegulae, inner 
margin of tegmina, veins of basal cell yellow, and posterolateral mar- 
gins of mesonotum, where its inner edge is tinged with red; costal 
cell dull orange-yellow, brighter near stigma, wings smoky; legs fus- 
cous, posttibiae narrowly margined yellow. 
Anal segment of female ovate. Ovipositor with first valvulae 
bilobed; a ventral lobe sclerotized at base, obliquely truncate apically, 
with a setigerous margin, overlain by a transparent membranous 
triangular plate; a dorsal lobe with upper margin with three teeth 
three-quarters from base, and two large spines at apex, lower margin 
membranous curved upward to a hooked process apically; second val- 
vulae narrow, with lower margin almost straight, upper produced into 
a vertical lobe subapically; lateral styles broad, lower margin sinuate, 
dorsal margin strongly decurved, apex blunt. 
Described from two females collected on the Amakura River, Vene- 
zuela, by J. G. Myers (February 1931). One specimen sent to 
B.M.N.H. 
