ON THE LIFE DURATION OF THE HETEROCERA. 339 



Palpi in length about equal to the diameter of the eyes, clothed with thick, 

 bristly, dark brown hairs, some of which are white tipped ; apical joint short, 

 conical, projecting a little beyond the hairs. 



Locklet black, curving about half-way over the eyes. Front of head dark brown. 



Thorax above and beneath clothed with long brown hairs, concolorous with 

 the posterior wings. 



Abdomen darker brown, reaching only to the pale baud of the hind wings. 



Legs dark brown ; the posterior pair have the femur and tibia of the same 

 length, bearing brown hairs which nearly equal them in length , tibiae armed 

 with two pairs of spurs ; tarsi twice as long as the tibias, moderately spinose. 



Expanse of wings, 1.65 in. ; length of body 0.55 in. 



Described from a single female received from Mr. W. II. Edwards. The 

 specimen was captured in Hamilton, Ontario, by Mr. J. Alston Moflfat, in 1877, 

 in company with another like it, which escaped capture. 



In the Hesperidm the antennal club affords excellent generic features. It is 

 unfortunate that in this unique specimen, the half of one antenna and the ter- 

 minal half of the club of the other, have been lost. It being also of the female 

 sex, we are without knowledge of the presence of a costal fold in this species. In 

 the absence of these characters, it is referred, with some doubt, to the genus 

 Eudamus, in which Dr. Herrich-Schseffer, Dr. Speyer and others arrange species 

 with rounded hind wings and those in which they are greatly prolonged. Of 

 the three groups in which Dr. Speyer has divided the genus, viz., *Hind wings 

 on submedian nervure little or not at all produced, — ''•'■'■Prolonged in a lobe, — 

 ***Caudated, — E. Electra falls in the first group. 



The detection of the above species is a very interesting discovery for this por- 

 tioi]uof the United States. 



IFromthe Canadian Entomologist, November, 1881, xiii,pp. 218-330.] 



ON THE LIFE DURATION OP THE HETEROCERA (MOTHS). 



Read before the American Associatioa for the Advancement of Science, at its Cincinnati 



Meeting, August, 1881. 



I have been requested by Mr. Edwards, who has presented to the Association 

 an interesting and valuable paper, "On the Length of Life of Butterflies,'' to 

 supplement it with some remarks on the Li/'e Duration of the Ueterocera. 



The period of time passed by insects in their perfect stage is an item in their 

 history to which, so far as I know, very little attention has been paid. It has 

 not hitherto been made a special subject of inquiry. When we seek to answer 

 the question, we find that very few of our published observations bear upon it. 

 The little that is known upon this point, in the Heterocera, Avould not authorize 

 the presentation of these notes before this body, were it not that a confession 

 of our ignorance should, and I hope may, serve as an incentive to the exami- 

 nation of the interesting question. 



It must prove a difficult field of investigation. Observations made upon species 

 in confinement, deprived of food and subjected' to other unnatural conditions, 



