206 THE CANADIAN ENTOMOLOGIST. 



the newly formed chrysalis has fully hardened to effect a change of form 

 in case of tharos. Last year I found that chrysalids which were exposed 

 at 9 hours after forming changed fully as much as those exposed at 6 and 

 3 hours. The temperature then was maintained at about 40°, and for 7 

 days only, and the changes were complete in nearly all the examples 

 treated, but there was no case of suffusion, as has appeared in the present 

 experiment at temp. -^Z" continued for 20 days ; though probably the 

 length of this last period had little to do with the matter, and a much 

 shorter time would have produced the same result. Even with the first 

 experiment this season as related, with an irregular temperature ranging 

 from 45° to 55° and perhaps higher, though no change of form resulted, 

 the cold completely retarded the development of the imago, as the butter- 

 flies did not emerge till their full period had passed after removal from 

 the ice. 



I think the facts I have stated throw light upon the cause, or a cause, 

 of the phenomena of suffusion, instances of which are recorded in books 

 and are occasionally seen in the field. Severe cold, as, for example, the 

 enveloping of a chrysalis newly formed with ice or snow as it lies under a 

 rock or on the ground, would apparently suffice to cause a blending of the 

 colors in the butterfly. 



TINEINA. 



BY V. T. CHAMBERS, COVINGTON, KY. 



ADELA. 



A. biviella Zell. 



I have received both sexes of this species from Prof. Feraud, of Orona, 

 Maine. It is a prettier species than A. bella Cham., with the fascia much 

 more distinct. Zeller describes only the ^ . It has the head and palpi 

 dark brown, with a very faint purplish tinge; the antennae with annulations 

 of dark purple and silvery white ; the body and legs dark purple, the legs 

 annulate with white ; hind wings pale purplish with darker ciliae ; thorax 

 and fore wings rich deep purple, appearing in some lights to be thickly 



