26 Mr. T. D. A. Cockerell on 



yuccce is constantly different from the type by the considerably 

 more produced median lobes ; at some future time Prof. Towns- 

 end will probably give it a varietal name. 



Aspidiotus (Chrysomphalus) Iilacinus, sp. n. 



? . — Scale light grey, the colour of the bark on which it 

 rests, about 1 millim. diam. ; immature scales show a white 

 dot and ring; old scales when rubbed show jet-black exuviae. 

 ? . — When living dull lilac, becomes bright green in caustic 

 potash, and the eyes of the embryonic larvas a rich dark blue. 

 No grouped ventral glands. Four pairs of lobes. 



Hab. On bark of oak (a species of the Quercus undidata 

 group), Dripping Spring, Organ Mts., New Mexico, April 23, 

 1898. It is parasitized by a species of Signiphora. 



A. Iilacinus resembles A. obscurus, but the scales are 

 smaller, the glandular processes at the bases of the lobes are 

 longer, there are no circumgenital glands, and the fourth lobe 

 is broad and serrulate. The anal orifice is a considerable 

 distance from the hind end, as in obscurus, not close to it, as 

 in tenebricosus, nor is the scale convex like that of tenebri- 

 cosus. A. Iilacinus has four pairs of lobes and long slender 

 glandular processes, quite after the manner of the Mexican 

 A. calurus; but the shape of the female is ordinary, not as 

 in calurus, the median lobes are entire instead of notched, and 

 the second lobes are only once feebly notched. The third 

 lobes are minutely serrate, with four notches, and the fourth 

 are serrate in the same manner. There are three little pro- 

 minences beyond the fourth lobe as in calurus. 



Melanaspis must be regarded as a section of the subgenus 

 Chrysomphalus, and extended to include A. tenebricosus, 

 Comst., A. calurus, Ckll., and A. Iilacinus, Ckll. It is to be 

 remarked that tenebricosus &c. in their longer glandular pro- 

 cesses and absence of circumgenital glands resemble the 

 penultimate stage of typical Melanaspis. 



I have a new locality to record for A. calurus, namely 

 Oaxaca, Mexico, whei-e it was found by Mr. A. Koebele on a 

 milky plant, Aug. 22, 1897. 



I wish to draw attention to a curious pigment found in 

 various Coccida?, mentioned above in the description of 

 A. Iilacinus. It is of a dull lilac-colour, but when placed in 

 liquor potassEe immediately becomes light green. My Parla- 

 toria lheo3, var. viridis, was named from this green colour; 

 but Mr. Alex. Craw lately sent me fresh specimens on stems 

 of " Ilex pedunculata " (doubtless an error for I. pedunculosa, 

 Miq.) from Japan, and I found that the female was of a 

 curious purple colour, except the mouth-parts and lobes (of 



