274 [January, 



hue of the legs and antennae ; the tarsus but little more than half 

 the length of the tibia ; the antennae longer and thinner than in 0. 

 cataphracta, the terminal joint tapering; the broad caudal lamella, 

 which follows the two dorsal ridges, projecting very much in the rear, 

 but slightly rounded posteriorly, its whole surface covered by a large 

 fascicle of long, longitudinal, thin, sharp-edged lamellae, into the base* 

 of which the posterior lamella of the border merge, these latter being 

 longer throughout than in the previous stages of the insects' life. To 

 this type belong, as one distinct species (0. urtica), the ? of the 

 following : — 



? . Aphis uriicce, Linn., S. N., 736, 30 (1767). 



[Frisch, Beschr. v. allerly Insecten von Teutschland, viii. 34, t. 17 

 (1730)]. 

 $ . Coccus fioccosus, De Geer, Mem., vii, 604, 9, pi. 44, fig. 6 (1778). 

 9 . Orthesia characias, Bosc, Journ. de Pbys., xxiv, 171, pi. 1 (1784). 

 <j ? . Dorthesia characias, l'abbe d'Orthez, id., 207, pi. 1, fig. 14—16 (1785). 

 <J . „ „ Westw., Intr. Mod. Class., ii, 445, frontisp., fig. 8 (1840). 



$ . Coccus dubius, Fab., E. S., iv, 228, 27 (1794), Panz., F. G., 35, 21. 

 $ $ . Coccus characias, Fab., S. R., 311, 29 (1803). 

 $ ? . Dorthesia urticcc, Burm., Handb., ii, 76, t. 2, fig. 6 & 11 (1835). 



9 . „ „ Zett., Ins. Lap., 314 (1840). 



$ <j> . Orthezia urticai, Amy. et Serv., Hemipt., 624 (1843). 



<J$. „ „ Sign., Ess. Cochinelles, 423 (1875), {syn. partim), pi. 1, fig. 



13, $ larva; pi. 21, fig. 1, $ imago ; fig. \,g, h, i, an-i 

 tennae of embryo and <$ and ? larva ; fig. 1, on, J geni- 

 talia. 

 A few words on some of this synonymy may be permitted. Linne* 

 says of the Ap J/ ides generally : "Species difficile distinguuntur, diffi- 

 cilius definiuntur," which is especially well illustrated in his description 

 of A. urticce, as follows : — 



" Inter maximas bujus generis, tota alba, obtecta quasi setis ; subtus vero lana 

 alba, postice valde obtusa ; de genere hsereo, utrum ad Aphides aut Chermes 

 accedat." 



This is vague enough, but reference is made to the antecedent 

 work of Erisch, in which, under the title, " Yon der weissen Blat-Lausei 

 auf der Matricaria," is a description from which the following is an 

 extract : — 



" Der Nacken ist mit drey uber sicb stebenden Blatlein bedeckt. Mitten auf 

 dem Ruck en geht eine Linie durcb, welcbe neben mit zwey Reihen solcber weisser 

 Blatlein besetzt ist, deren auf jeder Reibe sieben, als Scbuppen iiber eine ander 

 liegen. Der Leib ist oval, wenn man ibn obne die Scbaube betracbtet, und ist an 

 den Seiten mit viel weissen und kurzen Biirstleiii besetzt, als mit Franzen." 



This agrees fairly with our insect : the figure is so small and in- 

 distinct, that it is worthless. 



