the Life History of Tricho^ptihis pahuhim. 151 



tapering of 6th abdominal onwards is by a curved outline with 

 sharper finish in 9th and 10th segments. The head in front is 

 rounded but has two lateral and a double (or two minute) frontal 

 eminences between them. Seen dorsally when the form has been 

 fully acquired, but the pink colour of the dorsal tubercles persists, 

 it is a most beautiful object from the elegance of its outline and 

 delicate but bright colouring. The liairs are of some assistance to 

 the pleasing effect. Before describing the hairs, it may be best to 

 note that there is the usual double dorsal -flange or ridge beginning 

 behind middle of mesothorax with a rounded eminence succeeded by 

 a lower one, then running across metathorax and abdominal segments 

 in line of tubercles and ending with tubercles on 3rd abdominal 

 segment. It is not high and marked as it is in some plume pupae, 

 but is quite definite and distinct, the tubercles on the following 

 abdominal segments (4th, etc.) are in line with it but represented 

 only in the middle of each segment, there being no continuous ridge 

 between them. 



The hairs on the mesothorax are, on either side, two in line of the 

 dorsal ridge but in front of it, and about the distance apart that the 

 last one is from the initial hi;mp on the ridge, outside each of these, 

 is again another hair, all equally spaced, so that there are two rows of 

 four hairs across mesothorax in front of anterior end of ridge. The 

 prothorax has a row of six hairs across it, three on either side. One 

 or two of the head (antenna-basal ']) hairs come into this same dorsal 

 view. These hairs are all colourless and about 07 or 0"8 mm. long 

 (two-thirds thickness of pupa). On the head are, in front above, two 

 hairs on each side and one on each side below, above the labrum. 

 These are 0-3-0*4 mm. long, colourless. On the metathorax are two 

 hairs, one on either side, white, about 0'6 mm. long, porrected and 

 arising at front margin of segment from the ridge. They appear to 

 correspond with the first of the two hairs in the following abdominal 

 segments which have the same appearance, nearly the same length 

 and direction (porrected) but arise further back on the segment. The 

 metathorax has no posterior hair as the other segments have. 1st, 

 2nd, 3rd, and 4th abdominal segments have each two hairs on either 

 side, apparently I and II, not arising very close togetherbut still on a 

 common eminence which on 1st, 2nd, and 3rd is part of the dorsal 

 ridge, the hairs are at an angle to each other of about 90°, the first 

 directed forward, the latter backwards and increasing the angle by a 

 little curvature, the posterior one is black, quite 0'6 mm. long, whilst 

 the front one is shorter on each segment, up to the 4th abdominal. On 

 the 5th and beyond there is only the posterior one, on to the 9th 

 segment, when it is at posterior margin of segment. It has about 

 the same length (0'6 mm.) on each segment. On these segments is 



