ORDER PARASITA. 153 



side, and their four biliary vessels are thickened towards the 

 middle of their length. Those of the trichodictes and philop - 

 teri do not exhibit this sort of swelling, and their testicles 

 are only four in number, two on each side. In these two 

 genera, besides, there are ten ovaries, five on each side. 

 In the female liothea, as far as the above-mentioned philo- 

 sopher was able to observe, there are but six, three on 

 each side. There is no positive knowledge concerning 

 the number of those of the female gyropi, nor of that of the 

 testicles in the males. In all those genera the thorax is 

 bi-parted, that is to say, the prothorax and mesothorax 

 compose the apparent trunk ; and its third division, or the 

 metathorax is united and confounded with the abdomen. 

 Mr. Kirby was the first, as I believe, who thus designated 

 this segment ; but M. Nitzsch appears to me to have also 

 employed the first of the other two denominations. See the 

 generalities of the class of insects. The limits of this work 

 interdict us from the exposition of the sub-genera which he has 

 established. We shall only remark, that that which he has 

 named goniodes, the fourth of the genus philopterus, is 

 solely peculiar to the gallinacea. In the collection of me- 

 moirs which terminates our history of the ants, we have 

 described in detail a species of ricinus — philoptere. 



M. Leon Dufour has formed, of the pediculus melittcB 

 of Mr. Kirby, already well observed by Degeer, who took it 

 for the larvae of the meloe proscarabeus, as well as by this 

 celebrated English entomologist, a new genus, ( Triongu- 

 lin des andrenettes,) of which he has published and repre- 

 sented the characters in the thirteenth volume (19, B.) of 

 the Annals of Natural Science. If this insect was not the 

 larva of this meloe, as Mr. Kirby thinks, there is no doubt 

 that it should form in the order of the parasites a proper 

 sub-genus ; but according to the researches of M. INI. Lepe- 

 letur and Servile, the opinion of Degeer is confirmed. 



