ON TRACHEAN ARACHNIDA. 527 



of the posterior feet ; these stigmata are concealed by the 

 haunches. 



The feet, eight in number, are very long, very slender, 

 cylindrical, composed of the haunch, of the thigh, of the" leg 

 formed of two articulations, and of the tarsus, whose length at 

 least equals that of the leg and thigh taken together, and 

 which is composed of a great number of articulations, the first 

 of which is very long, and the last provided with a small hook, 

 which appears simple, and arched. 



The naturalists who have treated of the phalangia, with the 

 exception of Lister and the younger Hermann, whose obser- 

 vations, however, were not published until after those of M. 

 Latreille, were not acquainted with the sexual organs of these 

 insects. These organs have a singular form, especially those 

 of the males, and in the two sexes their position is curious : 

 the male organ is a sort of elongated dart, composed of two 

 pieces, the first of which, forming the base, is short, thick, and 

 of a soft consistence ; it serves as a case to the second, which 

 is a little longer, more narrow, almost scaly, terminated in 

 Ph. cornutum by a triangular membranaceous piece, hooked 

 at the internal side, with a small setaceous point, black, and 

 arched, which proceeds from the superior angle of this piece. 

 In a state of inaction, this part is concealed in a sheath, situ- 

 ated immediately under the mouth. The sexual part of the 

 female is placed similarly to that of the male. We discover 

 there a membranaceous tube, compressed, and very flexible, 

 which serves as an oviduct. By pressing a small eminence 

 called lip, which is found between the last two pairs of feet, at 

 the base of the abdomen, these parts may be made to protrude 

 in both sexes. 



These arachnida do not spin, as some authors have pretended. 

 Many species have a strong odour of the walnut-tree, and all 

 are carnivorous. They feed on little insects, which they seize 



