94 CALIFORNIA ACADEMY OF SCIENCES. 



The larval state of socialis and Terlootii is entirely the 

 same, but as to that of Menapia my information is very im- 

 perfect. It is always found in regions abounding in conif- 

 erous trees, and has been supposed to feed on them, but 

 as Madrono is usually found in the same districts, it is pos- 

 sible that its food plant is the same as that of the other spe- 

 cies, although Arbutus is as exceptional a food for Fierids 

 as a conifer would be. The peculiar silky web made by the 

 other species has never been observed in the range of 

 Menapia, and as such a conspicuous object could hardly 

 have escaped observation, the larvse (still unknown) proba- 

 bly do not form them. It may be that it is a social weaver 

 only in its earliest stages, as is the case' with Aporia crategi, 

 the food plant of which is also an anomaly in the series of 

 the Pierides. 



II. 



A NEW Cerocampide. 



By the kindness of Professor J. J. Rivers, of our State 

 University, I received a caterpillar preserved in alcohol, and 

 two living chrysalides, which in process of time furnished 

 a pair of moths belonging to the series of the Cerocampides. 



A very similar insect was described and figured in Smith 

 Abbott's Insects of Georgia, under the name Notodonta 

 concinna. 



A close examination of Professor Rivers' specimens has 

 convinced me that they canuot belong to the genus Nofo- 

 donta, but that they are most related to Bryocan^ja. It 

 may be that the species deserves generic rank, but I leave 

 this question to other Entomologists, who have in a full 

 series of this and related types better means for comparison. 



Dryocampa Riversii mihi. Imaginis statura Notodontce 

 concinnm Smith. Thorax atropurpureus, abdomen et ante- 

 rius et posterius pallidum, medium atropuvpureum. Alse 

 anticse griseae, nervosa3, atomis longitudinaliter extensis ir- 



