224 [June, 



very old examples." Presumably they are then obscured by a thickening 

 of the chitinous denn. My British examples exhibit a narrow but closely 

 continuous series, containing from 70 to 80 pores, which extends almost 

 up to the level of the rostrum (see fig. 5). As observed b}^ Newstead, 

 they vary in size and sometimes coalesce. There are also many small 

 and slender spines scattered over the dorsal surface. These condi- 

 tions agree more nearly with Newstead' s description of the nymph ; 

 but my examples are certainly adult females and contain embryos. 

 I have nymphs also, almost as large as the adults, but distinguishable 

 by the smaller anal opercula and a complete absence of the pores. 

 Possibly Newstead's supposed nymphs are reallj'- early adult females. 

 In all other particulars (antennae, limbs, form of anal operculum, 

 marginal and stigmatic spines, etc.^ my examples agree closely with 

 Newstead's description and with preparations from the type material 

 that I have in my collection. 



The male puparium is of the iisual form : transparent, glassy, divided 

 into three median and four pairs of lateral plates. Length 2 mm. 



Mr. Kaye informs me that the particular plant upon which the 

 insect was found, " is a natural hybrid from the island of Desterro, 

 S. Brazil," and that it " must have been in this country for very many 

 years, as this orchid has not been imported for years — 20 at least, and 

 probably 30 — because it has been superseded by home-raised hybrids." 

 It must not be inferred from this that the insect must have existed in 

 our plant-houses, undiscovered, during this long period. It may very 

 well have been introduced upon some other plant and have established 

 itself upon its present host since its importation. Its host, in British 

 Guiana, was Aricennia. 



Lecanium zehrimim Green. 



To the other recorded host-plants of this species I have now to 

 add Salix. 



The species is very much infested by Chalcid pai-asites, of two 

 species, which have been identified by Dr. Luigi Masi, of Geneva, as 

 Corny s scutellata Swed. and Prionoviitus sp. — probably new. 



Lecanium hesjjeridum L. 



Occurring abundantly upon Acalypha, in plant-houses at Tring. 

 This is an addition to the already long list of hosts of this widely 

 distributed species. 



