Dec. 1899.] Dvar: Life-Histories of N. Y. Slug Caterpillars. 243 



the leaves are no longer fit to eat and the larvre must be at once trans- 

 ferred to fresh leaves with a moist camel's hair brush, as they will not 

 walk to the leaves themselves. The jar containing the larvje should 

 be cleaned every day, but the leaves will keep from three to six days 

 if the conditions of moisture are properly attended to. When a little 

 grown, the larvse will move themselves to the fresh leaves. The 

 Eucleid larvae are hardy, and if attended to properly and not unduly 

 crowded, grow up nicely in closed jars. Some patience is required, 

 as their period of growth usually takes two months. In raising large 

 numbers of one species it will be found useful to place them on the 

 growing tree, covered with a large bag of cheese cloth. This method 

 is often attended with great loss from the accidental inclusion of para- 

 sites, chiefly the predaceous Hemiptei-a, which as eggs easily escape 

 observation. I have lost a whole bag full of larvae from placing them 

 in a bad location where the heat was too intense. Therefore I do not 

 recommend the method except for numbers of larvae too large to 

 handle in tumblers. 



Generic Revision of the North American Eucleids 



(CoCHLIDIIDyE). 



Assuming my genealogical tree to represent the actual phylogeny 

 of the Cochlidiid?e, we may prepare a generic revision of the 

 family, using as primary characters those imaginal ones that corre- 

 spond to the large branches of the tree, and as secondary ones those 

 corresponding to the smaller branches. This will serve also to test 

 the relative phylogenetic value of the ordinary generic characters as 

 used in this family. Beginning with those that prove the more funda- 

 mental, we have : 



The character is gained once in phylogeny. 



1. The antennae of the male were originally pectinated to the tip. 

 In branch a they have become simple ; in branch B they remain pec- 

 tinate, but at branch J the pectinations are restricted to the basal por- 

 tion, the tips becoming simple. 



2. The labial palpi * may have been originally short and porrect, 

 but exceeding the frontal tuft. At branch a the character is exag- 

 gerated, at least never lessened ; but at branch C they are shortened, 

 not reaching beyond the frontal tuft. 



* Not including Isoc/icetes, which adds another exception in both palpi and tibial 

 spurs. 



