of the genus Orthezia. 85 



Notwithstanding the imperfection of diagnosis, in 

 consequence of the accidental want of lamellation on 

 the back of the female of 0. mcenariensis, the species 

 appears to be of the type of 0. urticce, but it is quite 

 distinct from it, notably by its very diminutive size (not 

 half) especially noticeable in the female, which sex has 

 9-jointed antennae, is blacker in the body, legs, and 

 antennfe, has the channels on the upper surface of the 

 marsupium proportionately slighter, the under side being 

 much more convex and more decidedly striate ; while in 

 the male there are three ocelli posteriorly on the head, 

 the pronotum has another formation, &c. 



PS. (Dec. 10th, 1883). — Since the foregoing was 

 written I have received from M. Lichtenstein another 

 example of the male, which quite confirms my descrip- 

 tion. At the same time he had the goodness to send 

 some other specimens of the species, prepared for the 

 microscope, illustrating the life-history. Of these two 

 are figured: — 



Fig. 5. An adult female deprived of its waxy covering. 



Fig. 7. An oval, luteous, naked pupa or nymph, which 

 I apprehend had only just assumed this form, and that 

 its ultimate development as a pupa, including another 

 moult, had been arrested,* for although, as might have 

 been expected, there is no rostrum yet, as compared with 

 the skin (fig. 6), the antennae are very short and the 

 articulations ill-defined, the legs are short, and there is 

 but one tarsal claw instead of two, as seen in figs. 6 

 and 6rt. Most remarkable also are the two large lateral 

 projections, one on each side of the mesothorax, which I 

 think represent sheaths containing incipient wings, such 

 as are seen in the nymph form of the Psyllkhe. They 

 appear also to be analogous to the thoracic adjuncts, 



* Jan. 22nd, 1884. This supposition may now be regarded as a 

 certainty, for in an extremely interesting article in the January 

 number of the ' Wiener ent. Zeitung,' iii., p. 11, Dr. Franz Low 

 has given in detail the results of his study of the life of Orthezia 

 urticce,, Linn., from the larva to the imago, and he has foi;nd that 

 in the male the nymph has two distinct stages, of which the first 

 (" Pronj^mphe ") lasts but three days, and the second ("wahre 

 Nymphe") lasts for eight days, and from the last form the imago 

 emerges. In the j)resent species fig. 7 represents the Pronymph 

 and fig. 6 the triie nymph. The information contained in this 

 excellent paper fills up several gaps in our knowledge of the biology 

 of the remarkable genus Orthezia, and deserves special attention. 



