58 



THE CANADIAN ENTOMOLOGIST, 



The host plants of T. pilosiis so far as obssrv^ed are the Euro- 

 pean plum, apple, sour cherry, pear, peach and ha\vthorn. Euro- 

 pean plums are by far the favorites, 

 with apples next and then sour 

 cherries. Peaches and Japanese 

 plums are very little infested. 

 Hawthorns in a few apparently 

 exceptional cases have been severely 

 attacked. 



The foliage of badly infested 

 trees becomes covered with numer- 

 ous fine, whitish blotches very 

 noticeable on the upper surface. 

 After a time such leaves become 

 brownish and at a distance of a 

 hundred yards or more the whole 

 of the foliage has the appearance 

 of being covered with fine road 

 dust. 



This hitherto unrecorded Red Spider has been found by th.e 

 writer in most of the fruit districts of the Province. That it has 

 not been mentioned earlier appears to have been due to its close 

 resemblance to our common species, Tetranychus himaciilatiis. 





Fig. 



— Tetranychus bimaculalus. adult 



female, greatly enlarged. 

 (Drawn by Miss M. Hearle.) 



GEOMETRID NOTES.— REVISION OF THE GENUS 

 HYDRIOMENA, HUB., GROUP WITH LONG PALPI. 



BY L. W. SWETT, BO.STON, MASS. 



(Continued from page 11,) 

 17. Hydriomena bistriolata Zell. (Verh. zool. — bot. Ges. 

 Wien, XXII, p. 493, 1872; Packard, Monograph, p. 95, ' 1876, 

 PI. VIII, fig. 32). This species with long palpi was placed in- 

 correctly as a variety of H. californiata with which it has nothing 

 in common. The general ground colour is dark olive-green and 

 white. It is quite a striking species, as the entire wing seems to 

 be surrounded with olive green and has a white mesial space. It 

 appears like a specimen of autiimnalis with the entire wing suffused 

 with dark olive-green and the white centfal portion contrasting 



February, 1915 



