July, '09] ENTOMOLOGICAL NEWS. 319 



a stump, fold or wrinkle," it is, however, used quite generally 

 by the older writers to indicate that portion of the fourth vein 

 above mentioned. 



Apical cell, the first posterior cell, i. e., that cell which is 

 bounded by the third vein, the anterior cross vein, the fourth 

 vein and the outer margin of the wing. 



Costal spine, a stout bristle present in some families of flies, 

 on the costa, near the end of the auxiliary vein. 



Middle, anterior or small, cross vein; it should be remem- 

 bered that this vein always connects the third and fourth long- 

 itudinal veins and bounds the inner end of the first posterior 

 cell. 



Spurious vein, a fold running from the base of the axillary 

 excision toward the hind margin of the wing. There is in the 

 Syrphidae also a spurious vein running from the base of the 

 wing in a more or less longitudinal direction through the first 

 basal and first posterior cells and lying across the anterior 

 cross vein. 



Pemphigus venafuscus n. sp.* 

 BY EDITH M. PATCH. 



(Plate XVII) 



On October i, 1909, large numbers of a dark winged floccu- 

 lent Pemphigus were observed by the writer to be settling 

 upon the trunks of lilac bushes (Philadelphus syringa vul- 

 garis} about half a mile from the University of Maine Cam- 

 pus. They sought the rough places in the bark and deposited 

 the minute sex forms characteristic of this genus. A Syringa 

 aphid seemed so remarkable an occurrence that the lilacs on 

 the campus were examined and were found to be similarly 

 sought by the same unknown species. This shrub was not, to 

 all appearances, a haphazard choice on the part of the aphid, 

 for maples, oaks, and numerous other trees close at hand were 

 avoided. 



It was a good flying season for aphids and a careful watch 



*Papers from the Maine Agricultural Experiment Station: Ento- 

 mology, 34. 



