294 Transactions of the Canadian Institute. [vol. ix 



Among the species of Lebertia with six bristles on the inner side of 

 the third palpal joint L. wolcoUi occupies an isolated position, on account 

 of the marked elongation of this segment. 



Locality : Canada (without further data) . 



Lebertia setosa Koen., n. sp. 

 Syn. Lebertia tau-insignita Koenike, Abh. Nat. Ver. Bremen, 1895, XII 

 Bd., S. 201. 



Female. 



The body without the projecting epimera measures i6'j5fi in length, 

 1245/ii in breadth and 1 1 I2ai in height at the middle. 



Its outline is elliptical in dorsal view, the frontal end between the 

 antenniform bristles truncate. A short distance behind the marginally 

 placed ijyes is a minute marginal tubercle with a short backwardly- 

 directed bristle. In lateral view the outline of the body, including the 

 epirreral shield, is oval ; the dorsum appears longitudinally strongly 

 arched; the venter, on the other hand, fiat. These statements are merely 

 tentative, their correctness depending upon whether the natural form is 

 reproduced after treatment with caustic potash. The skin is thin, the 

 cuticle smooth, appearing structureless eve^i under an oil-immersion lens. 

 The antenniform bristles are 83/x long, stout, bkuit and borne upon low 

 tubercles, sepax'ated by a distance of 282/* and bent backwards. 



The two pairs of eyes are situated behind the antenniform bristles, 

 just at the body-margin, and are separated from one another by a distance 

 of 481/^. 



The capitulum including the pharynx is 282/* long, the maxillary 

 shield strongly tumid, the posterior superficial process of the same strongly 

 directed upwards and deeply sulcate. The posterior angles of the latter 

 are provided with a slender acute process. The posterior processes 

 of the maxillary wall are of considerable length and are not divergent. 

 Their posterior end is bent inwards. The pharynx does not lie as usual 

 in the cavum pharyngis but extends far up out of it at its posterior end. 

 The pharyngeal canal is unusually broad; its posterior end is distinctly 

 constricted on each side, not bell-shaped and only slightly expanded. 



The mandible measures 365/"- in length, the claw 66/"'. The hyaline 

 process is only slightly shorter than the latter. The posterior end of the 

 basal segment is strongly bent. 



The maxillary palpus is strongly chitinized; all five segments are 

 distinctly porous. The length of the palpus is 400/u.. The third seg- 

 ment exceeds the fourth in length to an abnormal extent. The bristle 

 of the flexor side of the second is very stout; it is curved towards the 

 basal segment and is densely pectinate on the convex side towards the 

 tip (Fig. 21). The same segment shows on the extensor surface two 



