Studies in Fruit Flies. Part L Dacini — Hardy and Adachi 
199 
Fig, 30 . Monacrostichus citricolus Bezzi. a, Mesonotum; b, lateral view of head; c, second segment of antenna; 
d, wing; e, front femur; /, extended ovipositor; g, apex of piercer. 
grooves; a reddish-brown spot in the center 
of the face, just above the oral margin; a dark 
spot on the cheeks at the lower margin of 
each compound eye and another pair on the 
lower part of the front at about the middle 
of the eyes and opposite the bases of the 
antennae. The hind portion of the occiput is 
slightly discolored with reddish brown. The 
head is almost devoid of bristles, only the 
outer vertical bristles are well developed. The 
superior fronto-orbital bristles are rather poor- 
ly developed and inconspicuous, they are 
about 0.5 as long as the vertical bristles, and 
are thin and hair-like. The ocellar bristles are 
less than one third as long as the verticals. 
The antennae are elongate, they are three 
times as long as the face and 1.33 times as 
long as the vertical length of the head. The 
first two segments are elongate, they are about 
equal in length, and the two combined are 
about two thirds as long as the third segment 
(Fig. 30^). The second antennal segment is 
very distinctly furrowed on the top margin, 
and at least an indication of the furrow ex- 
