_ Localities in which Pellagra is Prcvalent. 29 l `
its  T longest, with a slight lobe on each side, outside it on each 2
>rt · side are five additional teeth gradually diminishing in size.  
¤ii  -‘ S · Case. brow,n, elongate, straight, or slightly curved, T
111 gradually expanding to its open end, from the edges of Q
which arise six more or less bent cylindrical processes con-   ‘
i tinued as ridges along the surface of the case. Processes  
_; about half the length of the case, which measures 3.5 mm. g
`c long, the expanded open end measuring 1 mm. in diameter. ‘
‘ Small cases are continued at the closed end into a slender . _ ·
  stalk, but as far as observed were-attached by the side, Q
 .. to stones, wood, andother objects, in the water. The case   .
 _ has an appearance of being composed of mud or refuse .  
  glued together, and is very fragile. The longitudinal ridges  
`of the surface appear to be produced by building out the   .
  open end of the case by adding material between the pro- l
  jecting processes. A Q V
n- i  ·’ Dr. Johannsen’s species was obtained from small  ir
g-  _ streams at Ithaca, New York. The case is, he says, com- ,;  
lg  Q posed of silk, but·those from Straight Creek are, as stated,  `  
e-  3 composed very largely of refuse. Differences between the  
t, .li  larva described by him and those collected by me are ap- " ,  
ty  . parently as follows: (1) The shorter antennae of the Ken- °_  
ie ,3  tucky species (about—halflthe length of the head); (2) the -   ‘4l‘ i
te  . acute appendages of the second antennal segment; ·(3) the #$73/
vs ef  Strongly pectinate median claws of the labrum.  
VS   No. 2.—This is a second, cylindrical, elongate larva,  
 ` taken with others on the under surfaces of rocks in rapids  
  of the Left Fork of Straight Creek. It resembles the one  
`? inhabiting the brown cases so much that it would by most l, 
__  people be considered identical. The head is pale yellowish yi 
f  brown, the two black specks of the sides of the head well    
al  ` forward and contiguous, though a line separates them.  
s.   Antennae short, less than half the length of the head; first  
in  > division long, bearing a seta at its `distal extremity, nearly ii' -
st ¤  as long as all the rest of the antenna; ‘SeCOHCl S€Q`iii€iiiS   .
e; Z Without appendages; three small distal segments tapering.  
ed   (llaws of the prolegs of the first body division numerous,  
ld  >. Siiiillie. Posterlor clawed legs long and diverging. TWO  
  . V  
—  
 ` iii.