of some South Brazilian TricJioptera. 137 



abdomen of the pupa are very long ; the number of the 

 dorsal patches is as in Grurnicliella, &c., those at the basis 

 of the 4th, 5th and 6th segments have two or three teeth, 

 but those at the basis of the third and at the end of the 

 fifth segments have two pairs of teeth, those of one pair 

 being much smaller. 



In one of the three species the slightly-arcuated brown 

 tubes are covered with very fine sand ; the larvas of this 

 species swim very well, their hind legs being furnished 

 with long; frinsces. The imaffo is the most beautiful 

 Trichopterous insect I have ever seen. 



In the second species the straight tubes are covered 

 with narrow bits of wood or other vegetable fibres ; those 

 on the back are arranged longitudinally, projecting con- 

 siderably beyond the mouth-end of the tube; those on the 

 sides and beneath are disposed in an oblique direction. 



In the third species to either side of the back of the 

 straight tube there are fixed a row of bits of wood, pro- 

 jecting laterally, and generally decreasing towards the 

 tail-end. 



Genus IV. 



From the great length of its hind legs I suppose that 

 a little larva, which makes curious nearly cylindrical 

 cases with the seeds of Callitriche, must be placed in this 

 section. 



SECTION IV. 



The cases of the three species of this section, wath the 

 larvae of which I am acquainted, differ fi'om those of all 

 other Leptoceridoi by their inner silken tube being much 

 flattened, the height being equal, or nearly so, to half the 

 breadth. The external aspect of the cases is yet much 

 more flattened and broad ; for they are covered with bits 

 of leaves, which laterally project more or less beyond the 

 inner tube. 



In the largest species the cases of adult larva? are 

 usually made of four leaves (sometimes thei'e are but 

 three), two forming the ventral and two the dorsal side ; 

 the anterior dorsal leaf is produced far over the ventral 

 one, so as to protect the larva when moving about. 

 This species lives in rivulets. The case of the pu])a is 

 fixed at the mouth-end, either extremity of the interior 

 tube being closed with a sieve. 



In the smallest species, which lives on trees between 



