tllE CANAD1A.N ENTOMOLOGIST. 13 1 



For the present, it will suffice to distinguish two forms of A. diffinis, 

 thus : — 



(i.) Plates wanting ; form inhabiting Demerara, = diffinis,'^QVf'5\.. 

 (2.) Plates present ; form inhabiting Jamaica, . =: later ails, Ckll. 

 Whether these really constitute a distinct species, or should be con- 

 sidered varieties oi punicoz, must be left for future decision. The name 

 pwiicce was published about three montlis before affinis, which pre- 

 occupied name was later altered to diffinis. 



(7.) A. bi/onnis, Ckll. This scale seems to be common on cultivated 

 orchids in Jamaica and Trinidad ; it should be looked for in conservatories 

 in this country. 



$ Scale about 2 mm. diam., circular to broadly-oval, depressed, sur- 

 face granulose ; exuvi.^ nipple-like, dark red-brown, placed on one side 

 of the centre. Colour of scale dark brown to black. 



Conspicuous white patches are left when the scales are removed. 

 V With three pairs of lobes, the first two pairs moderately large, 

 well-developed, with parallel sides ; the third pair more or less rudimen- 

 tary. Scale-like plates between the lobes. On the margin, cephalad of 

 the lobes, is a pointed projection, having a spine on each side of it. 



$ Scales much smaller than those of the female, narrow, elongate, 

 with the exuvite at one end. 



This species might be confounded with A. ficus, but the form of the 

 male scale will distinguish it at a glance. 



(8.) A. juglajis-regice, Comst. Prof C. H. T. Townsend, when Ento- 

 mologist of the N. Mex. Exp. Station, found a species of Aspidiotus on 

 ' some young plum trees at Las Cruces, N. Mex. The trees were there- 

 upon destroyed, and the scale, which had evidently been imported, has 

 not been seen in the neighbourhood since. 



Some specimens, however, were preserved ; and on examining them I 

 concluded that they were A. juglans-regioe. Not having any of that 

 species for comparison, I sent a few of the Las Cruces scales to Dr. 

 Riley, asking for his opinion. He kindly replied thus: — " The specimen 

 which you send differs from Comstock's A. juglans-regice. It has four 

 lateral rows of pores on the anal plate, while there are but three in Com- 

 stock's species. The fourth or external row in the New Mexican species 

 is composed of about 20 pores, whereas in Comstock's it is composed of 

 3 to 8 only." 



In these points it resenibl^s Colvee's A. juglandh^ wh'ch has the 



