REPORT OF THE STATE ENTOMOLOGIST 1903 105 



Eremotylus arctiae Ashm. 



This species is by no means rare, though not recognized as a 

 distinct form till 1890 owing to its having been confused with 

 E r e m . m a c r u r u s , which it closely resembles. A critical 

 examination of the material in the state collection, Dr Lintner's 

 private collection, and that from Cornell University, lent by Pro- 

 fessor Comstock, has resulted in the finding of several examples 

 of this species. Two specimens were taken in the trap lanterns 

 at Cornell ; one Aug. 3 and the other Aug. 22, 1889. Owing to the 

 kindness of Messrs Howard and Ashmead, we have been per- 

 mitted to examine a type of this species. 



Hosts. This species is parasitic mostly on some of the arctians, 

 though it has also been reared from saturnians. The following 

 hosts are known : Ecpantheria deflorata Fabr., 

 Diacrisia virginica Fabr., Automeris io Fabr. 

 and Callosamia promethea Drury. 



Description. The following is Mr Ashmead's description : 



In Erem. macrurus, the wings have a decided fulvous 

 tinge and the veins are fulvous; the second recurrent nervure is 

 about twice as long as the first recurrent nervure, the third 

 discoidal cell, therefore, is much wider at apex than at base; in 

 Erem. arctiae, the wings are entirely without the fulvous 

 tinge and the basal nervure, tips of median and discal nervures 

 vary from brown to black, or piceo-black; the second recurrent 

 nervure is only slightly longer than the first recurrent nervure, 

 the cubital nervure being arcuate and the third discoidal cell, 

 therefore, is about as wide at apex as at base ; in Erem. 

 macrurus, the transverse metathoracic carina is always more 

 or less distinctly sinuated at the middle, in Erem. arctiae 

 it is straight. In Erem. arctiae the hooks on the hind 

 wings vary from seven to nine ;in Erem. macrurus they 

 are from 13 to 15; in the former the claws are pectinate; in the 

 latter simple. 



Male 26 mm long, wing expanse 35 mm; female 20 to 28 mm 

 long, wing expanse 36 to 40 mm. 



Figure 6 on plate 2 represents the wing characters of Erem. 

 macrurus. In Erem. arctiae the cubitodiscoidal 

 nervure is arcuate; in the type examined it was a nearly perfect 

 arc, but in other specimens there was a slight tendency to the 



