464 Mr. J. Blackwall on the Structure, Functions, (Economy, 



the observations of Siebold and Newport quoted, are quite suf- 

 ficient to demonstrate that the active larva? are transformed into 

 the inert larva?.] 



EXPLANATION OF PLATE XVI. A. 



The figures 1,4,6,7 and 8 represent the ovum of the Rhynchites some- 

 what compressed in order to show the parasites more distinctly. 

 Fig. 1. a, shows the first parasite, which is seen removed from the ovum 



and further magnified in fig. 2. 

 Fig. 3. represents the same animal a, with the interior vesicle b, which is 



the first indication of the second parasite, or of the larva of the 



Pteromalian. In the following figures a and b have the same 



signification. 

 Fig. 8. A dorsal view of the nymph of the Pteromalian; c, the thrown-oif 



skin ; d, the cocoon ; e, the shell of the egg of the Rhynchites. 



XXXVIII. — A Catalogue of British Spiders, including remarks on 

 their Structure, Functions, (Economy, and Systematic Arrange- 

 ment. By John Blackwall, F.L.S. 



[Continued from p. 275.] 



169. Walckena'cra hiemalis. 

 Walckena'cra hiemalis, Blackw. Linn. Trans, vol. xviii. p. C32. 



Numerous individuals of this species were observed running 

 actively on rails in meadows and pastures near Llanrwst in 

 December 1836 and January 1837. 



I cannot concur with M. Walckenaer in adding Walckena'cra 

 hiemalis to the synonyma of Argus cucullatus, from which it 

 differs in size, colour, and organization (Hist. Nat. des Insect. 

 Apt. t. iv. p. 510). In the form of the anterior part of the 

 cephalo-thorax and in the disposition of the eyes, the males of 

 these spiders are very dissimilar. 



170. Walckenaer a bifrons. 



Walckena'cra bifrons, Blackw. Linn. Trans, vol. xviii. p. 634. 

 Argus bifrons, Walck. Hist. Nat. des Insect. Apt. t. iv. p. 510. 



Mr. T. Glover captured an adult male of this spider, which is 

 the only specimen I have had an opportunity of examining, in 

 June 1838 among coarse herbage in Gwydir Wood, near Bettws 

 y Coed, Caernarvonshire. 



171. Walckenaer a hicolor. 

 TValckenaera bicolor, Blackw. Linn. Trans, vol. xviii. p. 635. 



M. Walckenaer is of opinion that Walckenaer a bicolor should 

 rank as a synonym of Argus elongatus (Hist. Nat. des Insect. 

 Apt. t. iv. p. 509) ; but they may be readily distinguished from 

 each other by differences in size, structure, and colour. 



