12 INTRODUCTION. 



probably £i Lepidocyrtus j P. fasciata, a Degeeria; and 

 P. bicolor, perhaps, an Isotoma. 



In 1831 M. Dufour described,^ in the ' Ann. des Sci. 

 Nat.,' two new species of Leinsmidce. 



Latreille's memoir on the " Organisation exterieure 

 et comparee des Insectes del'ordre des Thysanoures,'' in 

 the ' Nouvelles Annales du Museum d'histoire naturelle,' 

 1832, is principally occupied with a description of the 

 external anatomy of the Lejnsinidce. As regards the 

 Poduridce, he very justly questions the accuracy of the 

 description of their manducatory organs given by Fabri- 

 cius, which, indeed, he does not hesitate to characterise 

 as " absolument fictive." He is, however, himself in 

 error when he considers the gastric tube as the ex- 

 ternal generative organ. 



Boisduval and Lacordaire, in their 'Faun. Ent. des 

 Env. de Paris,'"^ adopted Latreille's group of Thysanoures, 

 and repeat the specific descriptions given by previous 

 writers. 



The first volume of the ' Transactions of the Ento- 

 mological Society of London ' contains a very valuable 

 memoir' on Irish Thysanuea by Mr. Templeton. This 

 paper is accompanied by two excellent plates. 



He founded two new genera, Orcliesella and Achorutes, 

 both of which have been adopted by succeeding 

 writers. 



Orcliesella : 



Antennae 6- or 7-jointed, nearly as long as the 

 body, filiform ; fork developed. 



And Acliorutes : 



Antennae 4-jointed, shorter than the head; fork 

 obsolete. 



He described briefly the following species : 



Orcliesella filicornis = Orcliesella cincta. 



„ cincta „ „ 



1 'Ann. des Sci. Nat.,' 1831, p. 419. 

 - ' Faun. Ent. des Env. de Paris,' 1835. 

 8 ' Trans. Ent. Soc. London,' 1834, p. 92. 



