l8 IVAR TKÄGÄRDH, (Schwed. Südpolar-Exp. 



The hypostoina rather long (PL II, fig. 15) with the usual four pairs of hairs. 



Maxillary lobes rather large, sharply pointed. 



The mandibles (PI. II, fig. 8); the lower jaw slightly shorter and more curved 

 than tlie upper one, with two anterior, small, and one posterior, large tooth, besides 

 the terminal tooth. The upper jaw with two small teeth opposite the terminal tooth 

 of the lower jaw, two others exactly opposite the median ones of the lower 

 jaw; between these the sense-hair, behind them a small incision and a high, 

 sharp edge. 



The palpi rather long, measuring 0,23 mm, with 5 free joints; the first four joints 

 of about equal length, the third (second free) somewhat swollen; the terminal joint 

 more narrow and only half as long as the fifth, richly provided with hairs. 



The legs. Legs I a little longer than the body, 0,65 mm, II 0,39 mm. III 0,4^ mm, 

 IV 0,54 mm, all richly provided with setiform hairs. 



Anibulacres I with smaller claws than the others and a caruncle which is only 

 two-lobed (Text- fig. 33). Ambulacres II — IV with larger claws and three-lobed 

 caruncle; the median lobe more pointed than the lateral ones (Te.xt-fig. 32). 



Locality: No. 8. One nympha. 



Tectopenthalodes nov. gen. 



General shape like that of Penthalodes MURR. Capitulum reduced. Epirostral 

 plate present, three-lobated. No pigmented, eyelike structure. Palpi 4-jointed. 

 Tyi)e: T. villosus Trt. 



In the description of P. arcticiis Tgdh. [13, p. 42] I already pointed out that 

 that species differed from the other species of the genus PentJialodes in some essential 

 respects. The differences are; the reduction of the capitulum and the presence of 

 an epirostral plate. In Penthalodes and indeed in most of the other genera of the 

 sub-family Eupodinae, except Ereyuetes and Stereotydeus, there is at the base of 

 the rostrum a spherical so-called capitulum, with two hairs; but on the other hand 

 there is no epirostral plate. 



In P. arcticus Tgdh. the capitulum is greatly reduced and modified into a 

 circular, depressed area, with two small hairs and there is a slight indication to an 

 epirostral plate in shape of a cuticular fold of the anterior edge of the céphalothorax. 



In T. villosus Trt. it is still more reduced, being only represented by a small 

 oval area with two small hairs, situated at the base of the epirostral plate; the area 

 is not distinctly demarcated as in the case of P. arcticus, but its texture differs from 

 that of the other cuticle in being smooth, while the cuticle round it is sculptured. 



