1887.] 



21 



NOTE ON SOME BRITISH COCCID^ (No. 7). 

 BY J. W. DOUGLAS, T.E.S, 



ISCHNASPIS, n. g. 



? scale very long and narrow, sides parallel, larval exuviae with a fringed 

 margin, followed by two moults, of which the latter is very long : pygidium without 

 spinerets in groups, but having a design of irregular lattice-work, composed apparently 

 of tliickeuing of, or under, the integument, in that pattern. 



$ scale not half the length of the ? , of like form, but only one moult beyond 

 the larval exuviae : imago not known. 



Fig. 1. 



^ IsCHNASPIS riLIFORMIS, n. sp. 



Fig. 3. 



Fig. 2. 



? scale jet-black, shining, straight, filiform (Fig. 1) ; larval exuviae oval, small, 



ochreous, witli a concolorous, small, ilat, angularly-lobate marginal fringe (detached, 



Fig. 2) ; the third pellicle at least twice the length of the second, widely rounded 



at the extremity, the successive minute increments of development perceptible 



throxighout the scale : pygidium occupied with a lattice-work formation of iiTcgular 



pattern, similar but not quite identical in all examples, yet on the posterior portion 



always alike ; a few isolated spinnerets near the margin : posterior margin with two 



median, distant, large, posteriorly rounded lobes, then on each side one smaller 



curved outwardly, and then another larger, but not so large as the median, with a 



small one adjoining ; some small spines between the lobes and five or six large ones 



beyond, the margin there having dentate plates (Fig. 3). 



Length, 3 — 3"5, breadth, 0-iO mm. 

 (? scale narrower and not half the length. 



The figures are from photo-transfers of camera-drawings by Mr. 

 G. S. Saunders. 



Altogether one of the most remarkable forms of Diasplna that I 

 know, both in respect of the scale and the character of the pygidium. 



Abundant in the conservatories of the Royal Botanic Society on 

 the leaves of various palms, Strychnos, Myristica, and other plants, 

 looking like little bits of silk thread accidentally affixed. 



Mytilaspis pinn^foemis. 

 Aspidiotus pinncBformis, Bouche, Stett. ent. Zeit., xii. 111, 5 (1851). 

 Mytilaspis pinncrformis, Sign., Ess. Cochin., p. 141, pi. vi, figs. 4 and 8. 



