"378 MRS. E. W. SEXTON ON A [Apr. 28, 



Male (PI. XIV. figs. 4 & 5). — This antenna is much longer in 

 the male than in the female, measuring 5 mm. in a specimen 

 21 '5 mm. in length, as compared with 3 mm. in a female specimen 

 of 23 mm. 



The peduncle is not so long as in the female. First joint 

 nearly twice as long as the 2nd and 3rd taken together (measured 

 along the inner surface) with the " auditory set* " as in female. 



The primary flagellimn consists of nine joints. The 1st is half as 

 long again as the others taken together ; it is incurved and 

 ■covered on its inner surface with dense masses of the long sensory 

 filaments. The six following joints are narrow proximally, 

 widening distally, and carrying on their inner margins fringes of 

 the small, stiff, curved setse, the 2nd and 3rd having the long 

 rigid, ovitstanding spines as in female, and the 5th, 6th, and 7th 

 each with a calceolus. The 8th and 9th are slender and cylin- 

 drical, the 9th tipped with one long stiff bristle, one long seta and 

 one small one. 



The accessory flagellum is much smaller than in the female, not 

 reaching to half the length of the first joint of the primary. It 

 is composed of one long laminar joint, one small joint slightly 

 constricted in the middle, and a minute apical joint. The 1st joint 

 has four small setse inset on the distal margin ; the 2nd one 

 " auditory " and one simple seta ; and the terminal joint has two 

 of the " auditory " and two or three simple setse. 



Inferior Antenna. — Female (PI. XIV. fig. 6). The 1st joint of 

 the peduncle is produced posteriorly downwards in a thick laminar 

 lobe ; it is hollowed behind, and in this hollow lies the small 

 2nd joint with its large antennal cone ; the 3rd joint is small, as 

 wide as long ; the 4th is more than twice the length of the 3rd ; 

 the 5th is not as broad as the 4th and very slightly longer. 



Setce. — The first three joints carry no setse. The 4th is fur- 

 nished on the posterior margin with seven long auditory setae 

 proximally and one at the distal angle ; with eight tufts of small 

 setce on the anterior margin. The 5th has twelve of these tufts 

 along the anterior margin, and a fringe around the anterior angle ; 

 ■^vith one small seta at the posterior angle. 



The flagellum consists of 29 joints, the first the largest ; 26 of 

 these are short, wider than long, decreasing gi^adually in size, 

 each with a row of setse inset anteriorly above the distal angle ; 

 the three terminal joints are very slender, cylindrical, the apical 

 joint having one long stiff bristle and one auditory seta. 



In the Irish specimens the proportions of the joints of the 

 peduncle are the same as described above ; the number of joints ia 

 the flagella vary — the 20'5 mm. specimen having 27 ; the 20 mm. 

 having 20 ; and the 3rd specimen of 22 mm. with 22. 



Male (PI. XIV. figs. 7, 8, 9). The first two joints of the peduncle 

 as in female ; the 3rd a little longer ; the 4th twice the length of 

 the 3rd ; the 5th as long as the 3rd and 4th taken together, more 

 slender than the 4th, narrow proximally, slightly curved, with 

 the anterior margin concave. 



