172 



[January, 



iig Z 



of the alimentary and other systems being clearly visible. The head 

 is elongate, with eyes placed about the middle of its length ; it 

 becomes narrower towards the mouth ; behind the eyes it contracts a 

 little, then the sides run almost parallel ; antennae long, at least two- 

 jointed, the second joint one-third the length of fii'st; a few long 

 hairs scattered over the head (mouth parts I cannot separate). Thorax 

 with three segments chitinous above, covered sparsely with long hairs ; 

 posterior legs rather long. Abdomen with four of the segments (I 

 think, 3rd to 6th) produced into lai'ge protuberances ; to these are 

 attached by short pedicels the foliaceous branchial trachese (fig. 1). 

 These protuberances are the most opaque parts of the body, apparently 

 on account of the collection therein of the bulk of the " fat-globules." 

 In the following segment, the form of the branchial trachese is 

 difPerent ; they are triangular processes arising directly from the 

 segment without constriction (fig. 2). At first I considered the 



position of these 

 organs lateral, but 

 after taking the 

 larva out of the 

 case, I am now 

 almost sure it is 

 dorso-ventral. 



Among Pictet's 

 figures, the case 

 of ItJiytrichia la- 

 mellaris agrees 

 most closely with 

 fig. 13, pi. XX 

 (without name), 

 but the larva as- 

 sociated wdth it 

 gives no indica- 

 tions of the pro- 

 tuberances, being 

 of the usual stout 

 form, although in 

 the description 

 the segments are 

 said to be " de- 

 coupes." 

 The accompany- 





f ^i (> 



