June, 1914-] Lloyd: Lepidopterous Larv.e in Rapid Streams. 151 



hair and set?e is shown in PI. IV, fig. 2. The four setcX of the frons 

 are equidistant from each other and the end punctures are the same 

 distance from the margin as from each other. 



The thorax has the first segment heavily chitinized and has two 

 lateral humps corresponding in position to the supra- and infra- 

 stigmatal gills of the following segments. Each of these humps is 

 tipped by a strong seta. These set?e and about five others on each 

 side complete a line across the dorsum. Two other punctures are 

 present behind this line of set?e, the more caudal one being the farther 

 from the median line. On the ventral side of the thorax there are 

 numerous small setse, especially abundant on the legs. 



The abdomen is widest at about its third segment and from there 

 tapers gradually to the tip. Prolegs are borne on the third to sixth 

 abdominal segments and on the tenth. Those of the tenth segment 

 are well developed, point caudad and are plainly visible from above, 

 PI. IV, fig. 3. A few small setas are present among the supra-stigmatal 

 gills. Other well developed setae on the dorsal side are represented 

 in PI. IV, fig. 3. On the ventral side there is a line of four setae 

 across the ninth segment and several small setae are present at the 

 base of each proleg. 



Five specimens of this species were taken. 



The pupa of this species is much like that of E. fulicalis, the most 

 noticeable difference being the presence of two wart-like prominences 

 bearing strong setae on the cephalic margin of the head. The setae on 

 the abdomen are longer and stronger and the caudal anchor has a 

 longer shank. Also the appendages are longer in proportion to the 

 total length of the body. The cast larval skins found in the cases 

 with these pupae furnished sufficient characters for identification. 



Both species of South American larvae were found in a swift 

 Andean stream that flows into the Cauca River about half way be- 

 tween the cities of Cali and Popayan. They were collected on the 

 19th of February. At that time the larvce collected were taken from 

 the cases represented in PI. IV, figure i. Since many pupae and one 

 empty pupal skin were found it is evident that the images were then 

 emerging, but larval cases may have been present and overlooked, for 

 at that time we were not familiar with these sheets. The pupal cases 

 PI. IV, fig. I, are similar to those found in Fall Creek but have more 

 flaring edges and the perforations, which are farther from the edge, 



