200 
PACIFIC SCIENCE, Vol. VIII, April, 1954 
tends almost the full length of the segment 
(Fig. 30c). This is very similar to the longi- 
tudinal seam on the second antennal segment 
which is characteristic of the Calyptratae. The 
second segment has a moderately strong bris- 
tle near the middle on the upper surface. The 
aristae are rather short, they extend scarcely 
to the apices of the third segments; their bases 
are yellow, the apices are black. The face is 
chiefly yellow except for the discolorations 
mentioned above. The face has a rather prom- 
inent tumescence in the middle marked off 
by a moderate concavity above, just below 
the antennae, and a rather deep concavity on 
the lower third of the face (Fig. 30^). A dis- 
tinct transverse furrow is present at this point 
on the face and is a chracteristic feature of the 
genus and species. The antennal grooves are 
deep and very conspicuous compared to those 
of other Dacinae. Thorax: Chiefly dark brown 
to black on the dorsum with yellow markings 
on the mesonotum as follows: A broad vitta 
on each side extending from the hind margin 
of the mesonotum to just beyond the suture, 
ending in front of the suture at a point about 
opposite the front margin of the notopleural 
callus (the vitta extends transversely along 
the suture for a short distance) ; the anterior 
lateral margins from just beyond the front 
margins of the notopleural calli including the 
humeri, except for the front margins, and a 
triangular to heart-shaped spot in the middle 
on the hind third of the mesonotum (Fig. 
30a). The scutellum is yellow except for a 
rather broad brownish band across the base. 
The yellow mark on each .mesopleuron is ex- 
panded dorsally so that the entire top margin 
of the sclerite is yellow. The sternopleura each 
have a large yellow spot above, continuous 
with the mesopleural markings, and the ven- 
tral margin is yellowish. The metapleura are 
yellow, the metanotum is black. The meso- 
notum is lightly grayish pollinose with one 
median and two submedian narrow brown 
vittae extending down the back as far as the 
median yellow spot on the hind part of the 
mesonotum. The suture is continuous or 
nearly so. In the specimens which have been 
studied it is actually narrowly interrupted in 
the middle of the mesonotum, although a 
slight depression does connect the two lines 
(Fig. 30a). The outer scapular bristles are 
strong, the inner are lacking. The humeral 
bristles are lacking, the anterior and posterior 
notopleurals and the three pairs of supraalar 
bristles are strong. The prescutellar bristles 
are lacking, and a single pair of apical scutel- 
lars are present. The halteres are yellow, light- 
ly tinged with brown at their knobs. Wings: 
With a very broad yellow costal band, filling 
all the cells anterior to Rs and extending a 
short way into this cell along the under side 
of the last section of vein R 4 + 5 - The cubital 
streak is absent except for a brief yellow mark 
in the base of the cubital cell. The costal cells 
are densely covered with microtrichia, as is 
the section of cell R directly above cell M. 
The wing venation is very distinctive and will 
distinguish this species from all other Dacinae 
known to the writers. The third costal section 
(stigma) is very elongate, it is over three 
times as long as the fourth section, and is 
equal to the combined lengths of the first 
two sections. The r-m crossvein is located 
near the apex of the discal cell (1st M 2 ) at a 
point almost opposite the lower end of the 
m crossvein. The cell 1st M 2 is strongly nar- 
rowed at its basal three fourths and is ex- 
panded at its apical portion. The first section 
of vein M 1 + 2 , from the fork to the r-m cross- 
vein, is arcuate and is nearly four times as 
long as the second section. The second sec- 
tion of Mi-F 2 , from the r-m crossvein to m, 
is just slightly longer than the r-m. The apical 
cell (R5) is distinctly narrowed at the wing 
margin. The attenuated portion of the cubital 
cell is elongate and about equal in length to 
the basal part of the cell or to the length of 
cell M. Vein Cui+lst A extends less than 
halfway to the wing margin (Fig. 30d ) . There 
is no evidence of a supernumerary lobe in the 
hind portion of the wing. Legs: Chiefly rufous, 
slightly discolored with brownish on the un- 
dersides of the femora, the coxae, and the 
