502 



SIR JOHN LUBBOCK ON THE THYSANURA. 



D'un gris verdatre sur la tete et le dos ; dessous du corps, antennes et pattes gris pale. 

 Une tache trian°-ulaire d'un brun sombre entre les yeux, et quelques autres taches 

 de mcrae couleur sur le reste de la tete. Yeux noirs. Deux lignes longitudinales et 

 paralleles de taches a peu pres triangulares et egalement brunes, sur le dos. Poils 

 gris. Appendice saltatoire tres-court. Deux crochets recourbes en dessus a Tex- 

 tremite de l'abdomen, au-dessus de 1'anus. 



" Longueur 1 millim. et demi. 

 " Sur les eaux stagnantes ; peu commuiie." 



I have several times found specimens on a hotbed in autumn which agreed pretty well 

 , ith Nicolet's description and figure ; the spots, however, were scarcely apparent. 

 The caudal appendage of my specimens is figured in PL XXII. fig. 23. 



\cnonUTES ptjrptjrescens, n. sp. (PI. XXII. figs. 24-26.) Brownish purple, underside o: 



body rather paler. Eyes not on a black patch. Body covered with short, scattered 

 white hairs ; two clawed hooks at the posterior extremity of the body. 



Length -^ of an inch 



On a hotbed and under branches of trees, throughout the year 



It differ 



i 



I was at first disposed to refer this species to the A. armatus of Xicolet. 

 Iiom ever, in the colour of the body, and in the absence of brown spots on the back. 

 Moreover, if I have been right in identifying the preceding species with the A, armatus 

 (Podura armata) of Nicolet, it differs from the present in having larger abdominal hooks 

 and in the form of the caudal appendage, as may at once be seen by comparing PI. XXII 

 fig. 23, which represents the caudal appendage of A. armata, with fig. 26 of the same 

 plate, in which I have figured the corresponding organ of A. purpurescens. Again, in 

 t he present species the eye is not on a black patch. 



The antennae are short, and composed of four segments ; the articulations are some- 

 what oblique ; and the two terminal segments form a sort of club. The mandibles ha\e 

 respectively four and five teeth. The skin of the body, as well as of the appendages, is 

 granular, and covered with short, scattered, smooth, white hairs. 



The anterior feet (PL XXII. fig. 25) have two long tenent hairs, which, however, are but 

 little swollen at the extremity. The large claw bears a single tooth on the underside, 

 the small claw is of somewhat peculiar form, and terminates in a filament. The secon 

 and third pair of feet differ from the first principally in having three tenent hairs, which 

 moreover, seemed to me to be more enlarged at the tip than those of the anterior feet. 



The caudal appendage is simple and two-jointed, as in Pl.XXII. fig. 26. 



i 



Achortttes murorum, Bourlet. 



Achorutes murorum, Bourlet, Podurelles, p. 35. 



I have occasionally found, during winter, a small very dark species of Achorutes,* 

 I have referred with a good deal of doubt to the A. murorum of Bourlet. It is o » 

 bluish black, and, as usual, is paler below. The eyes are on a black patch. It has very 



■hicb 



minute abdominal hooks, and the feet have a single tenent hair. The skin 



nulated 



