146 NATURAL ARRANGEMENT OF INSECTS. 



(136.) In a scientific point of view, the Thrips is a 

 still more interesting insect, since it unquestionably 

 unites a suctorial order with another that is masticating. 

 So naturally is this genus connected to the Aphides, the 

 Chermes, and the Cocci, that neither M.Latreille, nor any 

 of the subsequent, reformers, have materially disturbed 

 this arrangement ; they include Thrips and Aphis in the 

 same family, placing the Cocci immediately after. All 

 entomologists admit that Thrips is amandibulated type ; 

 although, from the excessive minuteness of the species, 

 and the consequent difficulty of understanding with 

 accuracy the parts of the mouth, we are somewhat de- 

 ficient in figures and descriptive details. Sufficient 

 evidence, however, is before us, to show that this genus 

 connects the Hemiptera, which is a suctorial order, with 

 some other which is both suctorial andmandibulated, or 

 furnished with jaws. The question, therefore, which 

 remains to be settled, is, to what mandibulated order this 

 genus leads. Now, there is only one in the whole of the 

 Annulosa, where the mouth, in the same manner, is 

 provided both with jaws and a proboscis ; and this order 

 is the Hymenoptera. The very aspect of the figure of 

 Thrips given by Reaumur, bears no slight resemblance 

 to the genus Scolia ; and that species figured by Mr. 

 Westwood, no less reminds us of a hymenopterous 

 insect. Great credit is due to Mr. Haliday, one of our 

 best entomologists, for his valuable memoir on these 

 insects ; although we cannot entertain his idea of 

 erecting them into an order. To his paper, and to Mr. 

 Westwood's valuable figures and dissections*, we must 

 refer the reader, contenting ourselves with retaining 

 the opinion of Latreille, that Thrips enters into the 

 circle of the Aphides. 



(137.) The Aphides present us with some of the most 

 extraordinary analogies in nature. These singular crea- 

 tures, as will appear by analogical comparison, represent, 

 in their own circle, the hymenopterous order among the 



* Modern Classification of Insects, ii. 1. fig. 57. 



