THE CANADIAN ENTOMOLOGIST 349 



Lygus communis var. novascotiensis n. var. Paler and more 



slender than the typical communis bat not differing materially 

 in the male claspers. Breeds abundantly on apple in Nova Scotia; 

 but in New York I have been unable to take any form of communis 

 on the apple. 



Length 5.3 mm., greatest width 2 mm., more slender and much 

 paler than the typical communis; the two black rays on the pro- 

 notum small but distinct; hemelytra more yellowish brown than 

 fuscous; lateral stripe of the body reddish or darkened with fuscous. 



This is one of the varieties or races of communis which may 

 be worked out from the forms inhabiting different plants, and 

 perhaps influenced somewhat by different external conditions. 



Described from several specimens received from ^^Ir. Wm. 

 H. Brittain, of Truro, Nova Scotia, collected from apple at Kent- 

 ville, Wolfville, and Smith's Cove, Nova Scotia, July 6 to 28, 1915. 



GEOMETRID NOTES. 

 On the Genus Xanthorhoe Hub. (Petrophora Hub.). 



BY L. W. SWETT, west SOMERVILLE, MASS. 



The names Xanthorhoe Hiib. and Petrophora Hiib. have been 

 used interchangeably, hut Petrophora Hiib. ("Tentamen, " 1805) 

 has priority over Xanthorhoe Hub. (Verz. bek. Schmett., 1816). 

 The majority of European specialists are dropping the use of the 

 "Tentamen" as they regard it more or less in the nature of a 

 circular letter of doubtful date and place. Those who care to go 

 farther into the matter should consult the excellent work of L. B, 

 Prout and C. D. Sherborn (Annals and Magazine of Natural 

 History, ser. 8, vol. IX, Jan., 1912); a^s^ Scudder (Proc. Am. 

 Acad. Sci., vol. X, pp. 91-293, 1875), C. H. Fernald (Amherst, 

 Mass., 16 pp., 1905), and Sherborn and Durant (Ann. Mag. Nat. 

 Hist., ser. 7, Vol. H, pp. 491-495, Dec, 1898.) 



The first species I propose to consider is defensaria Guen. 

 (Spec. Gen., vol. X, p. 411, 1857; also Packard, Monograph, p. 

 149, 1876). This species was described from a male taken in 

 California. Guenee says "near munitata Hiib. and especially 

 convallaria, but more obscure," etc. The form that agrees most 

 closely with this description — -and I have examined some 400 



October, 1916 



