THE CANADIAN ENTOMOLOGIST 9 



GEOMETRID NOTES — REVISION OF THE GENUS 



HYDRIOMENA HUB., GROUP WITH 



LONG PALPI. 



BY L. W. SWETT, BOSTON, MASS. 



This group may be distinguished from the groups with short 

 and moderate palpi by the greater length of these appendages, 

 which are beak-like; the slightly larger size and the slighter 

 variability in colour. The prevailing shades seem to be olive-green 

 and white with variations of black and less of the red, except in 

 Hydriomena ruherata Freyer. I have regarded H. speciosata Pack, 

 as typical of this group, because it is less confused in general 

 collections than the other species. 



14. Hydriomena speciosata Pack., (Proc. Boston Soc. Nat. 

 Hist., XVI, p. 22, 1874; Monog., p. 102, 1876). 



This large, showy, green and white, mottled species is fairly 

 well known to the average collector. The long beak like palpi are 

 typical of this group. The specimen figured by Packard in the 

 Monograph (PI. VIII, fig. 37) is a variety and not the one from 

 which the original description was drawn. I have limited the 

 type to the one from which the original description was drawn, 

 there being two distinct forms before him at that time. The type 

 is the green form with white mottlings and the one figured in the 

 Monograph is the black-bordered variety, which I described in 

 the Can. Ent. as Hydriomena speciosata Pack., variety agassizi 

 Swett (vol. XLII, p. 277, Aug. 1910). The normal form of 

 speciosata I have from British Columbia and California and I 

 should not be surprised if it had quite an extended range even 

 through South America as there are several closely-related forms 

 figured in the Biologia Cent. Amer. The typical speciosata is 

 dark olive-green with a white ground colour and five black bands 

 crossing the fore wings, and has black dots at the ends of the 

 veins and a black apical streak. The margin of the fore wing is 

 greenish where in the variety agassizi it is intense black. The 



January, 1915 



