( G4 ) 



a row of 2 to 4 in tlio contre, and a snliajiical row of 1^ or 0. The bristles of the 

 second sogmoiit of the antenna nearly reach tlic apex of the chib in the c?, while 

 they are longer than tlic clnb in the ?. The rostrnm only extends to the apical 

 third of the coxa, being bnt a little longer than the maxillary palpus. The first 

 segment of the latter is longer than the se<'ond. 



Tliorax. — The jirothorax bears a comb of A2 sjiines and one row of 15 {S) 

 or 18 (?) bristles. The mesonotum is nearly covered all over with small hairs 

 from the base to the postraedian row of bristles, these small hairs being less 

 nnmerons in the S than in the ?. The metanotnm bears two rows of small hairs 

 in front of the row of long bristles and some additional liairs on the back. The 

 mesosternite also has a nnmber of small hairs in front. 



Abdomen. — All the tergites bear two ( cJ) or three (?) rows of small bristles 

 in front of the row of long ones, besides a nnmber of additional small dorsal 

 bristles. The first to fourth tergites have 2 or 15 apical spines on each side. The 

 basal sternite has on each side 3 to 5 bristles in the c?, 7 or 8 in the ? ; the sternites 

 of segments three to six have a row of 3 or 4 bristles in the <? and S to lU in 

 the ? , with a number of rather long bristles in front of the row. There is one 

 long antepvgidial bristle, which is accompanied by 2 minnte hairs in the S and 

 by 2 short bristles in the ?. The seventh sternite, which in the <^ bears 2 or 3 

 bristles on each side, has more than 30 on each side in the ?. The hindniargin 

 is shallowly incurved in the ?, as shown in the figure (PI. XI. fig. 10). 



Lcc/s. — The liindfemnr bears a row of bristles on both sides, the nnmber of 

 bristles varying from G to 10. The hin<ltibia is covered with bristles all over the 

 outer surface, and has a row of G lateral bristles on the inside. The longest apical 

 bristle of the first hindtarsal segment reaches beyond the apex of the second 

 segment, and the longest bristle of the second segment lieyond the apex of the 

 fourth. The fifth segment is peculiar. It is rather short, and bears a nnmber of 

 short stout bristles on the ventral surface, 4 of them being placed at and near the 

 a])ical margin. Moreover, the first as well as the third |)air of lateral bristles 

 are distinctly shifted towards the middle line. 



Modifird Siymi'iifs. — cj. The eighth tergite has the njipor portion of tlie apical 

 margin more slanting than usual, there being at and near this margin aljout 14 long 

 bristles, while the lower proximal portion of the tergite bears about 8 long bristles. 

 The eighth sternite is long and slender. Its apex cannot clearly be made out in 

 our only specimen. The clasper (PI. X. fig. G) is long, and bears before the a])ex 

 a vertical process (p) which is rounded at the tip. The movable [>rocess (f) is very 

 stront'ly curved near its liase and slightly widens towanls the apex, the distal 

 margin lieing rounded and the proximal apical angle pointed. This process bears 

 2 short stout bristles near the base and 2 long ones near tlie a]iex. The outline of 

 the ninth sternite cannot clearly be made out. It ajjpears to be widened ventrally 

 proximally to the centre and to bear on this widened jiortion numerous minute 



hairs and a row of short stout bristles. ?. The eighth tergite has about 18 short 



bristles above the stigma, a jiatch of 4 long and 4 to G short bristles below it, and 

 about 24 bristles on the lower half. The stylet is nearly five times as long as it 

 is broad. 



Length : c? 2G, ? 3-2 mm. 



We have one ])air from the foot of the Sierra de la Ventnro, jiroviiice of 

 Buenos Aires, found on Vijilochelidon ci/unoleurus by Dr. K. W'oltihiigel, July 28, 

 1905. 



