254 MR. B. F. CUMMINGS OX 



truncate at the terminal end. On segment 2 there is one tergite 

 and indications of a second in front of it. On segment 3 there is 

 a single tergite, broad at the base, narrowing rapidly in front. 

 On segments 4 to 7 there are two tergites, each being broad and 

 long but broader than long, the first the longer of the two. Only- 

 one tergite on each of segments 8 and 9. The sternites show 

 the same disposition and arrangement as the tergites, excepting 

 that in segment 2 there are no vestiges of a second sternite ; in 

 segment 3 two sternites, as opposed to the single tergite, while 

 the sternum of segment 8 is occupied by the genital plate, which 

 in its anterior part is rectangular and in its posterior part tri- 

 angular, the apex pointing backwards. The apex is minutely 

 pectinate. A dentate fringe runs on each side from this apex 

 towards the lateral margins of the abdomen. The pleurites differ 

 from those in the male. In segment 2 they are small and thinly 

 chitinised. In segments 3, 4, and 5 the lower angle on the 

 ventral surface is produced into a short process. 



Chcetotaxy. Male. — Head : On preantennal area, dorsal sur- 

 face, several minute hairs. At the rostrum two minute hairs. 

 Just in front of the antennas, dorsal surface, a transverse row of 

 hairs. Behind the antennas, situated along a well-marked trans- 

 verse groove, another row of small hairs. Along the temples a 

 longitudinal row of four hairs, the most posterior being large and 

 spiny. At about the level of these two posterior bristles, but 

 situated nearer the middle line of the dorsal surface, two small 

 hairs. On the ventral surface two small hairs on each side of 

 the mouth-parts in front of the antennas. A bristle at the base 

 of each antenna, lower surface. Thorax : A long bristle and 

 a minute hair on the inside of each spiracle. Abdomen : On the 

 lower margin of each pleurite two hairs ; these, as usual, are very 

 long on segments 7 and 8. On the dorsal surface segment 1 * 

 has two hairs. On segment 2 there are two rows of spine-like 

 hairs, two in the first row and four in the second ; in the latter 

 row the two middle hairs are much the largest and equal in size 

 the two in row 1. Along the lower margin of tergite 3 are eight 

 hairs, the two middle ones the largest, the remaining six flanking 

 each side in two groups of three. Tergites 4, 5, and 6 each have 

 a row of eight flat spines, the two middle ones the largest. There 

 is also a smaller spine on each side in the space between the 

 pleurites and tergites. On tergite 7 is one row of only four 

 spines ; another smaller spine on each side in the space between 

 tergites and pleurites. On tergite 8 there are only four spines, the 

 middle ones occupying a position one on each side of the basal 

 plate. At the extreme end of the abdomen are two small stiff 

 hairs. On the under surface there are five hairs in the first row 

 and six in the second on the sternite of segment 2 ; in segment 3 

 five in the first, and in the second six, with another one on each 

 side. The sternites of segments 4, 5, and 6 each carry a row of 

 six hairs, with another one on each side. On sternite of no. 7 

 * As is ordinarily the case in the Order, segment 1 is small and almost obsolete. 



