562 Analytical Notices of Books. 



parts of the preceding and following years, and are many of them 

 well adapted to advance materially the progress of Natural History 

 in its various departments. Those connected with Zoology are 

 six in number, four of which are from the pen of the Rev. Lans- 

 down Guilding, one from that of Mr. W. S. MacLeay, and the 

 remaining one from that of Mr. Hogg. The analysis of these 

 which we propose to offer, will enable the reader to appreciate 

 justly the value and importance of the information which they 

 contain. 



" The natural History of Xylocopa Teredo and Horia maculata; 

 by the Rev. Lansdown Guilding," comprises descriptions of these 

 insects, which have long been well known, but the account of 

 which is rendered interesting by the accompanying observations 

 relative to their manners and habits. The sexes of Xylocopa 

 Teredo differ considerably in colouring; that of the male?, the 

 Apis Brasilianorum of Linnaeus, being yellowish red above and 

 blackish beneath ; while the female, X. Morio ? Fab. Syst. Pie- 

 zat., is throughout of the deepest black. This species inhabits 

 the dried trunks of trees, perforating them in a longitudinal direc- 

 tion to form nests, which are never confused, though frequently 

 scarcely separated from each other, and are divided by a ring of 

 wood into distinct cells, filled with a mixture of honey and pollen, 

 a single egg being glued to each of them. These cells are also 

 inhabited by the larva of Horia maculata, Fab. which probably 

 frequents them for the sake of the nutriment provided for that of 

 the X. Teredo, to whose parent it frequently falls a victim. When 

 full-grown, the larva of the Horia appears to excavate for itself a 

 cell, (differing in form from those occupied by the Xylocopa,) in 

 which it passes through its pupa stage. Figures of the larva?, 

 pupa;, and perfect state of both insects are given in illustration of 

 this paper, together with a section of a portion of wood perforated 

 by the Xylocopa. 



The results of the succeeding Paper, " l On the Nature of the 

 marine production, commonly called Flustra arenosa ; by John 

 Hogg, Esq." are calculated to remove this substance from the po- 

 sition which it has hitherto held in the classification of animated 

 nature. Each of the cells which it contains is occupied, according 



