122 LEPIDOPTERA. 



made a careful and accurate comparison of each larva, and 

 took as accurate a description as I could. I also secured 

 from my kind and talented friend Mr. Buckler some ex- 

 quisitely life-like coloured drawings. There appear to be 

 unvarying distinctive differences between the two larvae, and 

 I am almost satisfied in my own mind that the two species 

 are entirely distinct. At any rate I am convinced that there 

 is no sufficient evidence at present for amalgamating them, 

 though Dr. Staudinger has done so in his " Catalogue 

 of European Lepidoptera," published in September, 1861. 

 Almost every Entomologist to whom I have sent the perfect 

 insect, with the exception of my excellent friends Messrs. 

 Doubleday and Bond, who are a host in themselves, think 

 it quite distinct from Helveticata, and to my eyes it has 

 never seemed anything else. Both, however, upon seeing 

 Mr. Buckler's drawings, tell me they think, if the differ- 

 ences between the larvae are constant, they may probably 

 be entirely distinct. I subjoin a description of the respective 

 larvae. Mr. Birchall has shown me an insect taken at 

 Killarney in 1859 which seems to be this species. 



Description of Larva of Eup. arceuthata, F?^et/. 

 Stout and plump, the same thickness from head to tail. 

 Nearly one-fourth as large and long again as Helveticata. 

 Ground colour grass green. Central dorsal line dark green. 

 Sub-dorsal lines pale yellow or yellowish white, lower edge 

 dark green. Spiracular line white or yellowish. Segmental 

 divisions yellow. Belly bright green. Central ventral line 

 yellow. Head somewhat bifid, slightly curved inwards 

 when at rest, invariahlij uniform dull-green. Anal tip of 

 central dorsal line always dark green. Spaces between sub- 

 dorsal and spiracular lines darker green than rest of the body. 

 Feeds on wild juniper from the end of September to middle 



