584 Anali/lical Notices of Books, 



cases formed of dried leaves and twigs of plants tied together by 

 threads into a cylindrical tube. It is chiefly by these characters 

 that the two species are brought together ; but, notwithstanding 

 their agreement in these remarkable particulars, we cannot regard 

 them as belonging to one genus. The first species, the Oik. 

 Kirbyi, is evidently most closely allied to Zeuzera : the form, and 

 especially the antennae, of the male are almost identical with that 

 genus : from its appearance we should not suspect any peculiarity 

 in the female, were it not for the extreme length of the penis, 

 ■which, it may be concluded, would not exist, unless rendered 

 necessary by some unusual conformation or situation of the organs 

 of the other sex. With Zeuzera, however, the second species, 

 the Oik. MacLeayi, has nothing in common : this is distinctly 

 one of the Tinece Bombyciformes, a group among which a larva, 

 that of the Psyche fusca, had long since been noticed in Europe 

 as possessing a similar habitaculum. From this dissimilarity in 

 the males of the only two species, we cannot regard the genus 

 Oiketicus as yet fully established. Mr. Guilding expects to have 

 it in his power to describe a third species : we hope that he may 

 do so, and that he will continue to direct his attention to the two 

 which he already possesses, with the view of confirming or cor- 

 recting his opinions relative to the affinity which he has assumed 

 as existing between thern. The illustrative figures are numerous, 

 and occupy three plates. 



Of the " Observations and Experiments, made with a view to 

 ascertain the means by which the Spiders that produce Gossamer 

 effect their aerial Excursions: by John Blackwall, Esq., F.L.S.," 

 we abstain from giving an analysis ; a sufficient abstract of this 

 interesting paper having been already given at page 296 of -our 

 present volume. 



One other paper alone remains to be noticed. It is " Of the 

 Insect called Oistros by the ancients, and of the true species in- 

 tended by them under this appellation : in reply to the Obser- 

 vations of W. S. MacLeay, Esq., and the French Naturalists ; 

 To which is added, a Description of a new species of Cuterebra ; 

 by Bracy Clark, F.L.S., &c." From the tone, as well as the title, 

 of this production, it is evident that its authour intended to cor- 



