THE CANADIAN ENTOMOLOGIST. 129 



first skin nipple-like, shining. In regard to the scale, our insect does 

 not very well agree with Morgan's account of dictyospermi, but there may 

 be variation in this respect ; in fact, Mr. Newstead has already indicated 

 that there is, by describing the peculiar variety arecce. It may be con- 

 venient also to distinguish the present (orvs\hy a. m.\x\Q, jamaicefisis ; so 

 the varieties of A. didyospermi can be tabulated thus : — 



(i.) Scale elongate-oval, greyish-white, . . = dictyospermi, Morg. 



(2.) Scale circular or nearly so, reddish or orange-brown. 



(a.) Nipple-like prominence surrounded by a depression, 



beyond which is a strong circular ridge, , = arecoe, Newst, 

 (b.) Without any conspicuous depression or 



ridge, = jainaice?isis, Ckll. 



On examining the form Jainaicensis, one can see the characters which, 

 if much more developed, would give rise to arecce ; and there can be no 

 doubt that if it should become necessary to make two species out of the 

 above forms, they will be dictyospervii and arecoe, yulih. jaifiaicensis as a 

 variety of the latter. 



A. mangiferoe, Ckll., from Jamaica, has a pale scale, more like that of 

 typical didyospermi; its affinity with didyospermi is evident, and I 

 should not be surprised if it ultimately becomes necessary to sink it 

 under that species as a variety. Mr. Maskell, however, to whom I sent 

 specimens of mangiferoe, wrote that the species appeared to him to be a 

 valid one. 



There is another scale insect, which in the female presents an extra- 

 ordinary resemblance to A. didyospermi, and that is Diaspis pinnulifera, 

 Maskell, found in Fiji and Demerara. But the form of the male scale, as 

 described by Maskell, will at once separate this from any Aspidiotus. 



(5.) Aspidiotus ptinicx, Ckll. — Jn. Inst. Jamaica, 1893, p. 255. The 

 typical form of this species has the scale slightly raised, snow-white, with 

 orange-brown exuviae. The % is almost circular, plump, orange with the 

 hind end slightly brownish. In the orange, plump $ , it resembles speci- 

 mens of A. rapax found on guava. The median lobes are large and 

 elongate, close together, and notched without ; the second pair is small, 

 the third practically obsolete. In the region of the lobes, but not beyond, 

 are some scale like plates ; and beyond the rudiment of the third lobe is 

 a conspicuous spine. The margin, beyond, shows one or two spines. 

 There are four groups of ventral glands. 



In the specimens on cocoanut from Dominica (the type being from 



