52 



THE ENTOMOLOGIST. 



Chirothrips frontalis, sp. nov. 

 Head and prothorax. 



figure. Eyes dark and relatively far back. Ocelli 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. Maxillary 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. Antenna 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 

 first two. An unforked sense-cone on 

 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, tibiae also thickened. All tarsi (except for 

 a small dark spot at the base of the second segment) and fore 

 tibiae 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, 1913, by 

 W. 0. Backhouse, probably from a plant (Compositse) 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, 



