8 [January, 



TWO NEW SPECIES OF STEPHANOCIRCUS FROM SOUTH AMERICA. 

 BT THE HON. N. C. EOTHSCHILD, M.A., F.L.S. 



Plate I. 



1. — JStephanocircus wolffhuegeli, spec. nov. (fig. 1). 

 Closely allied to S. minerm, Rothsch. (1902, Nov. Zool., p. 219), 

 from Paraguay. 



Head : — Tlie anterior edge of the helmet is less curved than in S. minerva, the 

 posterior edge bearing 17 teeth. The genal comb consists of six ( c? ) or seven ( ? ) 

 teeth. The first segment of tlie maxillary palpus is longer than the second and 

 third together. The rostrum reaches to the apical third of the fore coxa. 



Thorax .- — The comb of the pronotum contains 16 or 17 spines on each side. 

 The epimerum of the nietathorax has three rows of bristles, each containing two to 

 six, five or six, and five to seven respectively, the anterior row being reduced to two 

 bristles on one side of one of our specimens, while it contains five bristles on the 

 other side in this individual. 



Abdomen : — There are more bristles on the abdomen than in S. minerva, the 

 anterior row on the fifth tergite containing 16 bristles in the ¥ and 17 in the <? on 

 the two sides together, the sixth tergite bearing 13 in the $ and 14 in tiie J. On 

 the seventh tergite there are some additional bristles in front of the two rows, which 

 latter are very irregular in the ? . At the apex of the seventh tergite there is on 

 each side one long bristle in the S , while there are three in the ? ; some of our? ? , 

 however, bear three bristles on one side and four on the other. These three 

 bristles of the ? are practically of equal length, while in ■'9. minerva the lower one 

 is much shorter than the others. On the sternites of segments three to six there 

 are several short bristles in front of the postmedian row, the seventh tergite bearing 

 in the ? 23 to 26 bristles on the two sides together, these bristles being much less 

 numerous in the ^ . 



Legs: — The legs are similar to tiiose of .S'. minerva, but some of the bristles are 

 longer; the longest apical ventral and dorsal bristles of the midtibia reach almost 

 to the apex of the first midtarsal segment. The longest apical bristle of the hind 

 tibia extends to four-fifths of the length of the first hind tarsal segment, while the 

 longest dorsal apical bristle almost reaches to the apex of that segment in the $ , 

 being proportionately a little shorter in the ^ than in the $ . The longest apical 

 bristle of the first hind tarsal segment reaches to the tip of the second segment, 

 while the longest bristle of the second segment extends a little beyond the apex of 

 the third. 



Modified segments : — ^. The eighth sternite bears two rows of bristles, the 

 anterior row consisting of eight bristles, the posterior row of nine, on the two sides 

 together. The clasper (fig. 1) is irregularly elongate-oval, being apically produced 

 into a short tooth-like process, and bearing on the outside a number of bristles as 

 shown in the figure, the four bristles placed at the dorsal edge of the clasper being 

 long and strong. The finger (F) is short and nearly evenly arched. The manu- 

 brium (M) is broad and obtuse. The ventral (= horizontal) portion of the ninth 

 sternite (IX st.) is narrower than the internal arm, bearing a row of five bristles 



