108 



NEW YORK STATE MUSEUM 



b Chitinoiis process extending from larger chitinous spot along the pos- 

 terior margin of the glabrous area and partly around its distal por- 

 tion. Male clasps obtusely rounded. .. .-. arcuatus Felt 



hi) Chitinous process from the larger spot not extending beyond the mid- 

 dle of the glabrous area. Smaller chitinous spot nearly circular 

 and slightly posterior to the center of the glabrous area .... 



appendiculatus Felt 



Eniscopilus purgatus Say 



This species is easily recognized by the two opaque, chitinous 

 spots in the cubitodiscoidal cell. The great tenuity and length of 

 the basal two abdominal segments is very marked, and is fre- 

 quently of service in identifying the insect, though this is also 

 true of the much rarer Enis. arcuatus and E n i s . ap- 

 pendiculatus. It is the species of this genus most fre- 

 quently found in the East while collecting in the daytime and the 

 one most common in collections. 



Life history and habits. The imagos fly from the last of June 

 till the last of September. They are diurnal and probably cre- 

 puscular in habit since they are attracted to lights to a certain 

 extent, as is shown by the trap lantern experiments conducted at 

 the Cornell University Agricultural Experiment Station in 1889. 



Trap lantern records 





1889 



1892 





JUNE 



JULY 



AUG. 



SEP. 



1 



JULY 



AUG. 







20 



. 



26 



28 



1 



5 



18 



20 



21 



23 



24 



15 



20 



21 



27 



8 



11 



U 



12 



30 



19 



H 



Male 



1 

 1 









1 











1 



















3 





1 





1 





1 



2 



1 



1 



1 



2 



2 





















Female . . 





1 



1 



1 



2 



1 



1 







1 



1 



20 



1 



.... 



2 



3 



It will be seen by examining the record for 1889, that there 

 are three distinct periods, separated by a space of about two 

 weeks, in which this species was taken. Thus none were captured 

 between July 5 and 18, July 24 and Aug. 15. These two non- 

 productive periods may have been caused by climatic conditions, 

 though it is hardly probable that unfavorable weather of any 

 kind would prevent the species from flying by night for 13 con- 

 secutive days, to say nothing of the other period of three weeks. 

 It may be that this periodicity indicates three broods or at least 



