31f^ THE CANADIAN ENTOMOLOGIST. 



EXPLANATION OF PLATE 7. 



Fig. I. — Xylococcus qiiercus : adult 9 antenna and leg. 



Fig. 2. — Xylo. qiiercus : (^ fourth stage antenna and leg. 



Fig. 3. — PJienacoccus artemisicE : adult $ antenna and leg. 



Fig. 4. — P. stachyos : a, antenna; b, leg of adult ? ; c, antenna of 

 larva. 



Fig. 5. — P. bahice : a, antenna ; b, leg of adult $ ; c, first 3 joints 

 of antenna of ^ . 



Fig. 6. — Dadylopius quercus : adult $ antenna and leg. 



Fig. 7. — D. viaritimiis : adult $ antenna and leg. 



A QUESTION OF NOMENCLATURE. 



The status of Professor French's Gastrophiliis cpilepsalis, described 

 in the September number of this journal, has interested me especially, as 

 I am preparing a new catalogue of North American Diptera. 



I am convinced that it was decidedly premature to assign a specific 

 name to this larva. In the first place, it was very small and immature, 

 and the earlier larval forms of Oestridfe are much less known than the 

 later, so that we do not possess the data that would enable us to separate 

 this species, for instance, from G. nasalis. In fact, I do not think 

 Professor French's description sufficient for the recognition of the same 

 stage of the larva at all, unless the specimens were known to have come 

 from a person affected with epilepsy. It must be remembered that there 

 is every reason to assume the normal habitat of this species of fly to be 

 in some other mammal. Its occurrence in man is in the highest degree 

 unusual. Is it not hopeless, then, to anticipate that specimens taken from 

 their normal host at some future time will be correctly associated with 

 this species ? And if such a thing could be, would there not be an in- 

 congruity in the name epilepsalis ? 



The name does not deserve a place in a catalogue, unless in a foot- 

 note. J. M. Aldrich. 

 Moscow, Ida., September 6. 



SUDDEN DISAPPEARANCE OF THE PURSLANE SAWFLY, 



SCHIZOCERUS ZABRISKEL 



P.Y F. M. WEBSTER, WOOSTER, OHIO. 



On page 54 of the current volume of the Canadian Entomologist, 

 I called attention to the sudden and almost total disappearance of this 



