10 Psyche [March-June 
narrowly yellowish at base, but more broadly at the sides; re- 
mainder of tergites shiny black, with three longitudinal yellow- 
ish stripes, the median one broadest on the 2d tergite where it is 
connected with the yellow base; the lateral ones less distinct, 
more or less broken up and extending only over tergites 3 to 6 ; 
sternites mostly honey-yellow to fuscous. 
Length (not including antennae), 6 mm.; of wing, 6.5 mm. 
British Guiana: Oronoque River, in latitude 2°42'N., 
July 31, 1936, a tributary of the New River in the Courantyne 
River drainage (N. A. Weber Collector) ; holotype at M.C.Z. 
(No. 27436). — Colombia: Mitu, Terr. Vaupes, August, 1943 
(P. Allen Collector); paratype at M.C.Z. (No. 27436a), some- 
what mutilated (lacking antennal segment 3), but agreeing in 
every respect with the holotype. 
The foregoing two species have most of the structural char- 
acters (particularly the widened tibiae) and the wing pattern 
of C. latitibialis Krober. These three species may be separated 
by the subjoined key. I have compared the holotype and only 
known specimen of latitibialis , from Kamakusa, British Guiana 
(M.C.Z. No. 27437). 
1. Third antennal segment relatively short, scarcely longer 
than first, its basal portion very slightly widened. Frontal 
callus black. Mesopleura without spots. Hind femora 
mostly black. First abdominal tergite pale yellow with a 
narrow black apical margin; second tergite pale yellow 
over basal and black over apical half ; remaining tergites 
black, without markings C. renjifoi. 
Third antennal segment markedly longer than first. Frontal 
callus partly yellowish-brown. Mesopleura with pale pol- 
linose spots. Hind femora mostly yellowish-brown 2. 
2. Third antennal segment about as long as combined first and 
second, its basal portion markedly swollen (Fig. 9). First 
and second abdominal tergites each with a narrow yellow- 
ish base, the yellow of the second somewhat extended 
backward in the middle; remaining tergites black, with- 
out markings C. latitibialis. 
Third antennal segment much shorter than combined first 
and second, its basal portion scarcely swollen. First ab- 
dominal tergite pale yellowish with black apical margin; 
second tergite pale yellowish at base and on sides; re- 
