No. 1.] H. H. Mann — On Helopeltis theiovora. 7 



wing has no very peculiar features. It is about 5*3 mm. long and 

 possesses, however, one spur-like vein in the membrane of the wiDg. 



Leg and Tarsus. — The hind leg is figured in Plate I, figs. 5 and 6, 

 and the tarsus separately (fig. 7) at a higher magnification. This is 

 in general, just as described by Mr. Waterhouse, u the femora dark 

 brown mottled with light brown : the tibiae light brown speckled 

 with dark brown." The lower part of the tibia is very hairy, The 

 tarsus is '56 mm. in length and is composed of three joints ; of these 

 the first is very large and hairy and overlaps considerably the second 

 joint, which is small, not being half the size of the first joint. The 

 third is intermediate in size, and like the other two very hairy. The 

 last joint bears two claws on each side of the tarsus. The femora 

 is about 2*6 mm. and the tibia 3^5 mm, in length. 



Scutellar horn. — This, which is the peculiarity of the genus 

 HelopeltiS) rises from the central segment of the thorax to a height 

 of 1*3 mm. It is bent backwards, though not nearly so much as 

 would be imagined from Mr, YVaterhouse's description. It contains no 

 duct of any sort. The tip is a cup (see Plate I, figs. 8, 9, and PI. II,. 

 fig. 10), shown highly magnified in fig. 10, and less so in fig. 8, which 

 contains a multitude of short hairs. There seems a good deal to 

 show that this is in some way a sense organ, but this point needs 

 further observation. 



Rostrum. — (Plate II, figs. 2, 3, 4, 5, and 6). — The rostrum 

 is four-jointed, and is usually held parallel to the body, and under- 

 neath it. It is 2 mm. in length. It contains, as is usual with this 

 group, four setae, which are shown in fig. 2, and one of which is 

 shown extracted in fig. 3." The rostrum is slightly hairy throughout 

 its length. The tip shown enlarged in fig. 4, and highly magnified 

 (front and side view) in figs. 5 and 6, is very hairy and can evi- 

 dently be used as a suction bell, 



Ovipositor. — The description of the ovipositor by Dudgeon 

 above quoted is complete except that he did not mention that it is 

 double. In all cases I have examined it is formed of two separate 

 instruments, quite serrated on one side of the tip, apparently to act 

 as a means of lacerating the stalk of the plant. Its length in the 

 mature insect is about 1*5 mm. 



Anus of the female. — This is depicted in Plate II, figs. 9 and 

 10 — and possesses no features of importance. The orifice itself is 

 about *3 mm. in diameter. 



The description of these features will probably be of some im- 

 portance in the classification of the species of this genus, which ha«, 

 not as yet been satisfactorily carried out. 



