292 Transactions of the Canadian Institute. [vol. ix 



the third palpal segment L. tyrrelli comes nearest to L. complexa Keen., 

 from which, besides the structureless cuticle, it is most clearly distin- 

 guished by the relatively longer genital emargination and the less prom- 

 inent postero-internal angle of the last epimeral plate. 



Locality: Flathead River, August 1883. 



Leber ti a wolcotti Koen., n. sp. 

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

 XIII Bd., S. 201. 



The following description is based upon a single poorly preserved 

 specimen. 



The length of the body is about I200fi. The firm cuticle of the body 

 is very finely and somewhat densely and irregularly punctate, a feature 

 which could only be determined under strong magnification and the use 

 of an oil-immersion lens. 



The hypodermal gland-areas are inconspicuous. By maceration of 

 the mite in a 10 per cent, solution of caustic potash the glands become 

 dark brown in colour and are most easily seen through the skin. The 

 antenniform bristle is 66/x long, of moderate thickness and bent back- 

 wards. On the outer side of the antenniform bristle is a very fine for- 

 wardly directed hair. On the antero-lateral margin is seen a short pro- 

 jecting bristle, bent strongly backwards. 



The capitulum is 265/^ long and 91/"' broad. Its buccal part projects 

 but little forward. Laterally at the base of the process of the upper 

 wall is a small prominence (Fig. 17). The pharynx is conspicuously 

 broad in front, thus giving the posterior end the appearance of being 

 less widened. 



The anterior end of the mandible, which is about 300M long, is strik- 

 ingly shortened to the knee; the slender posterior end, on the other hand, 

 unusually long and curved towards the extensor side. The broad hya- 

 line process (Mandibularhautchen) is about equal in length to that of 

 the short mandibular claw. 



The maxillary palpus, like that of the following new species (L. 

 setosa), is remarkable for the elongated third segment, which is not shorter 

 than the penultimate segment (Fig. 18). The second palpal segment has, 

 on the extensor side, a moderately convex curvature. The penultimate 

 segment is almost straight and its distal end is dorsoventrally thicker than 

 its proximal end. On the former there are present on the inner side, be- 

 sides several small hairs, a sharp-pointed chitinous spine. The bristle 

 of the flexor side of the second segment is probably very stout; nothing 

 more definite can be said of it as it is broken ofif at the base from both 

 palpi. The extensor side of this palpal segment has in its anterior half 

 three stout curved bristles, the most anterior of which is densely and 



