bo THE ENTOMOLOGIST. 
figure. Hyes dark and relatively far back. Ocellc distinct, the 
posterior ones behind the level of the back of the eyes. Crescents 
red-brown, distinct (in mounted specimens). Mouth cone rounded, 
reaching about two-fifths across the pro- 
sternum. Mazillary palps three seg- 
mented, the basal segment shortest, the 
apical longest ; four or five sensory hairs 
at the tip. Labial palps two segmented, 
the basal segment very short and in- 
distinct, not much more than a ridge on 
the labium. Antenne about two-thirds 
longer than the head; the first segment 
short and broad, the second much longer 
and narrower except at the apex where 
it is produced outwards into a blunt 
prominence, the third with a distinct 
pedicel, the fourth and fifth equally 
long, the sixth the longest, the eighth 
longer than the seventh. Colour: first 
and second dark, third clear, fourth to 
eighth darker but not so dark as the 
Chirothrips frontalis, sp. nov. first two. An unforked sense-cone on 
Head and prothorax. the third and fourth segments. 
Prothorax long, as wide as the head 
in front but much widened posteriorly, the whole surface of the 
pronotum finely striated and with a number of minute hairs 
scattered unsymmetrically over its surface. No long spines at 
the front angles, two at each hind angle and about six smaller 
hairs on each side along the hind margin. Pterothorax slightly 
wider than the prothorax in front, gradually narrowing behind. 
Legs normal for the genus, fore femora thickened and produced 
outwards at the base, tibize also thickened. All tarsi (except for 
a small dark spot at the base of the second segment) and fore 
tibie lighter than the rest of the legs. Fore wings pale brown, 
clearer at the base. About twenty (eighteen to twenty-one) spines 
on the costal vein, the distal ones finer and longer than the proximal; 
five or six spines at the base of the fore vein and two on its apical 
half; four, five, or six on the hind vein. The veins are usually very 
indistinct except near the base of the wings; this varies in different 
specimens. Hind wings clear, vein indistinguishable. 
Abdomen normal, hairs on the ninth and tenth segments pale 
and weak. The ninth segment short, about half as long as the 
tenth. 
Described from eleven macropterous females taken near 
Buenos Ayres, Argentine, South America, in January, 1918, by 
W. O. Backhouse, probably from a plant (Composite) locally 
known as ‘‘ cepocaballo.”’ 
Type in the Hope Department, Oxford University Museum. 
This species may be easily separated from all others of this 
genus by the great prolongation of the head beyond the eyes, 
and also from hamatus, Trybom, obesus, Hinds, crassus, Hinds, 
