A NEW SPECIES OF CHIROTHRIPS FROM SOUTH AMERICA. 51 



tember, Zeller). Hagen stated that he had it from the Harz, 

 Bavarian Alps, and Styria (?). Ulmer adds Hessen. Supposing 

 it to be the true flavipennis of Pictet, it should occur in the Val 

 d'llliers, Valais. This list may require revision, as some of 

 these localities may refer to H. chapmani. I found H. flavi- 

 pennis commonly at Silvaplana (July 18th to 25th, 1904) ; Eis 

 has taken it in the Murgtal (July 27th, 1888), at Cierfs in the 

 Miinstertal (July 14th, 29th, 1909); and Klapalek in Carinthia 

 (July 31st, 1899). 



A NEW SPECIES OF CHIROTHRIPS (Thysanoptera) 

 FROM SOUTH AMERICA. 



By C. B. Williams, B.A., F.E.S. 



At the beginning of this year I received a small collection of 

 miscellaneous insects from Mr. W. 0. Backhouse, taken near 

 Buenos Ayres, in the Argentine Republic, South America. Four 

 genera of Thysanoptera were represented — Chirothrips, Franklin- 

 iella, Physothrips, and Thrips ; the Chirothrips, which is a distinct 

 species, is described below ; notes on the others are reserved for 

 the present, in the hope of getting further material to elucidate 

 some doubtful points. 



Gen. Chirothrips. 

 Haliday, Ent. Mag. 1836, iii. p. 444 ; emend. Uzel, Monog. d. 



Thysanopt. 1895, p. 79; emend. Hinds, Proc. U.S. Nat. 



Mus. 1902, xxvi. p. 133. 



Chirothrips frontalis, sp. nov. 



Female (macropterous). 



Measurements. — Head, length 0-15 mm., width (behind the eyes) 

 0-122 mm. ; prothorax, length 0-22 mm., greatest width 0-26 mm. ; 

 pterothorax, length 0'32 mm., width 0-30 mm. ; abdomen width 

 0-35 mm. ; wing, length (from basal lobe) 0-80 mm., width (about 

 halfway along) 0-045 mm. 



Antennae : — segment 12 3 4 5 



length (im) 14 36 38 34 34 

 width (/x) 36 40 24 24 21 



Total length, about 1-4 mm., antennas 0-24 mm. 



Colour uniform dark grey brown, fore tibiae and all tarsi a little 

 paler, the third segment of the antennae distinctly lighter. 



Head (Fig. 1.) longer than wide, produced beyond the eyes into a 

 long prominence more than half as long as the remaining portion of 

 the head. The sides of this at first diverge slightly and then converge 

 rapidly to a rounded point ; on the converging portion the antennae 

 are situated. There are no long hairs on the head but several small 

 ones which vary slightly in position and may not be quite sym- 

 metrical. In general they conform to the arr-angement shown in the 



E 2 



