138 Dr. Fritz Miiller's Notes on the Cases 



the leaves of Bromelm, there are generally five or six bits 

 of leaves on the ventral, and one more (six or seven) on 

 the dorsal side of the tube. Before its change the larva 

 closes the mouth end by fastening one more bit of leaf to 

 the ventral side. 



This is also done by the third species, intermediate 

 between the other two in size as well as in the number of 

 leaves used in the construction of its case ; there are 

 generally three or four on the ventral and four or five on 

 the dorsal side. This species lives principally in very 

 small rivulets; with hardly any water, trickling along a 

 declivitous rocky ground. 



To the different habitat of these three species corre- 

 sponds a remarkable difference in the feet of the pupa?. 

 In the first species there are not only dense fringes of 

 long hairs on the second pair, but similar hairs, though 

 much less developed, exist also on the feet of the fore-legs. 

 These fringes are rather rudimentary in the third species, 

 and completely wanting in the Bromelia species, which in 

 this respect agrees with the waterfall Trichoptera. 



The pupa? have more dorsal patches than any other of 

 our Leptocerid(B ; for there is a pair on the eighth ab- 

 dominal segment also, and besides this, there is on the 

 back of the ninth segment a pair of long spear-shaped 

 horny processes. 



The first species emerges from the pupa in the evening, 

 as most Leptoceridce do, but the Bromelia species usually 

 during the first hours of the afternoon (at least in cap- 

 tivity). The branchiffi of the pupa subsist, in a rudi- 

 mentary condition, in the perfect insect. 



The three species agree, not only in the construction of 

 their cases, in the structure of their larvje and pupjE, but 

 also in the neuration of the wings and other characters of 

 the perfect insects (in all the wings the radius is confluent 

 at its apex with the first apical sector ; in the posterior 

 wings the discoidal cell is open, the apical forks Nos. 2, 

 3 and 5 being present). It would be most unnatural to 

 separate them into two genera, and yet they differ in the 

 number of spurs. In the Bromelia species there are 

 2, 4, 2 in both sexes, while the other two have 2, 4, 4. 

 In any other respect the intermediate species resembles 

 more closely to the Bromelia species than to the larger 

 one, with Avhich it agrees in the number of spurs. 



