438 MR. LUBBOCK ON THE THYSANURA. 



The basal part gradually tapers to the extremity, which is sparingly clothed with short 

 hairs, but has no trace of the three long, button-bearing hairs which occur in Smynthurus 

 Buskii. The terminal segment is, as usual, free from hairs ; it scarcely tapers, but is 

 simply rounded off at the end. On the inner side are from 25 to 35 small teeth, of uniform 

 size ; between the two last is a rounded knob, which occupies the space of about three 

 teeth, but does not project beyond the general outline. 



The ventral tentacles are very similar to those of S. Buskii. They are provided with 

 the same gland-like papillae, and fulfil doubtless the same functions. 

 Papirius Saundeksii, n. s. Body globular, without a re-entering angle. The great ab- 

 dominal segment is produced backwards, so that the two terminal segments are not 

 seen when the animal is in its natiu'al position. The penultimate segment is small, 

 and only distinguishable on the ventral side. 



Variety a. — Head yellowish, with a tinge of green on the posterior part, more or less 

 distinct brownish markings on the central line, and a curved patch of the same colour 

 behind the antennae ; eye-disk black. Back greenish, mottled with brown : the size as 

 well as the darkness of the markings varies in different specimens ; but the fundamental 

 pattern is generally the same, though the proportions of the parts may differ considerably. 

 On each side of the median line on the anterior half of the abdomen is a more or less 

 interrupted band ; about the middle of the back (that is to say, at their lower extremity) 

 these are joined on the outer side by a diagonal band, and the two on each side unite, then 

 separate and pass outwards and backwards, soon however returning again to the middle 

 line, and thus enclose a more or less quadrate, or circular, space of the paler colour. In 

 the middle line, and at the posterior end of the great abdominal segment or segments, is a 

 marking which is very characteristic. There is first of all a small dark square, immediately 

 behind which are three oblongs of the same colour, and at the posterior end a dark band 

 passing backwards. The pale spaces between the oblongs vary in width, and sometimes 

 are almost obliterated. The oblongs also vary in length, sometimes increasing gradually 

 in length from the front one, like the steps of a pyramid, while at others the two last, or 

 all three, are of equal length. 



In different specimens I found every shade between brown and dirty olive-green, while in 

 some the light ground preponderated over the darker markings, and in others the reverse 

 was the case. Sometimes the darker parts were of a beautiful purple. 



The sides of the body, and the two basal segments of the antennae, are of the dark hue, 

 whatever that may be, with, however, a few spots of lighter colour. 



The two apical segments of the antennae were purple in all my specimens, which struck 

 me as a very curious fact, since I should have expected that the antennae would have 

 followed the law of colouring which prevailed on the other parts of the body. 



The posterior segment of the abdomen, the spring, the whole underside of the body, 

 and the legs are pale, the latter with a tinge of red. 



Variety b. — The dark parts more extensive, and very dark brown or purple. This 

 variety is at first sight so different from the former, that, until I compared the nature of 

 the markings and the structure of the different organs, I supposed that it was a different 

 species. 



