288 THE CANADIAN ENTOMOLOGIST. 



the Dept. Agriculture, remarking at the same time that the relationship 

 between convexiis ■a.wA juglans-regice needed investigation. 



Mr. Pergande, when my letter was received, proceeded to look into 

 the matter, arriving at the following remarkable results : — 



MR. PERGANDE's report. 



"Prepared a number of females of A. jiiglans-regice var. albus, and 

 compared them with typical Juglans-regice, but failed to find any struc- 

 tural differences between the two. 



" The slides on which Comstock's types of A. coiivexus were mounted 

 are not in our collection, and were probably taken to Ithaca. I pre- 

 pared, therefore, 13 females, taken from twigs which had been labelled by 

 Comstock A. convexus, ' type ; ' and also 6 females, which had been 

 placed by Comstock in alcohol, while examining the species in California; 

 but, when they were examined under the microscope, it was found that 

 not one of them had any groups of pores, and that they agreed exactly 

 with the description and figure of A. rapax. * 



'• To be certain that they really are rapax, I prepared also a large 

 number of females, taken from twigs which had been labelled by Com- 

 stock A. rapax ' type,' and f(jand, after comparing those marked rapax, 

 that all of them are absolutely identical. 



" Comstock must have made a mistake while describing the two 

 species ; he had evidently by mistake taken hold of another species, 

 while working on rapax. It is quite possible \.\\2ii\\\?, convexus \% identical 

 with €\\}!\tx juglans-regice or ancylus. This point could be settled if Com- 

 stock would allow UP to examine the slides." (Pergande). 



Since A. convexus is thus founded on the scale of rapax 4- the $ 

 insect of another species, the name must apparently drop. The name 

 " convexus " refers to the convex scale of rapax, and should be placed in 

 the synonymy of that species — which is itself, according to Mr. Morgan, 

 of Oporto, a synonym of A. camellice (Boisd). 



It is to be observed that in the Dep. Agr. Rep. for 1880 (188 1), A. 

 convexus is described on p. 2q^, A. juglans-regice on p. 300, and A. rapax 

 on p. 307. Therefore, tho'^e who consider rapax distinct from cajnellicB 

 may have to consider whether the name convexus, which has priority of 

 place, should not be preferred for it. On the other hand, if it turns out 

 that convexus, apart from the scale, \V2i^ juglans-regice, it again has priority 

 of place, should any one care to use the name for a scale which is almost 

 flat, 



