290 Transactions of the Canadian Institute. [vol. ix 



The hind leg almost twice as The hind leg ij/^ times as long 



long as the body. as the body. 



The external genitalia 99/i long; The external genitalia 116/i, long 



and Ii6yu. broad at the middle, and 149/i broad in the middle, 



narrower in front than behind. broader in front than behind. 



The three genital acetabula on The last genital acetabulum 



each side arranged in an arcuate shifted forward to the inner side 



series, the last acetabulum 30," long, of the second one, and 55/ti long. 



Lehertia tyrrelli Koen., n. sp. 

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

 XIII Bd., S. 201. 



The length of the body without the projecting epimera is 581^, with 

 the latter 630/*. 



The outline of the body is obovate, the front between the antenni- 

 form bristles, which are separated from one another by looju, somewhat 

 produced. The margin of the body is nowhere excavated (Fig. 13). The 

 cuticle is apparently without any special structure; no striation or 

 punctuation (porosity) could be perceived even with the aid of an oil- 

 immersion lens. The hypodermal glandular areas are small but stand 

 out sharply. 



The two pairs of eyes are separated from one another by lOO/* and 

 from the body-margin by 33/A. The length of a double eye measures 33M. 

 The eye-pigment is black and of slight extent. 



The capitulum with the projecting pharynx measures 150/x in length, 

 52/A in breadth and 83,u in height. The buccal part of the organ forms a 

 broad stout projection (Fig. 14). The lateral walls are bent far inwards 

 above and in lateral view give the appearance of a stout protuberance 

 at the base of the upper processes. These processes are long, not spread- 

 ing, rounded laterally behind, terminating dorso-ventrad in an acute 

 apex. The processes of the lower maxillary wall are directed strongly 

 laterad and dorsad. The pharynx lies in the concavity of the maxilla 

 and is 40/Lt broad and 35/* thick through the marginal thickenings at its 

 posterior end. 



The mandible is 130/i. long. Its basal segment is dorso-ventrally 

 strikingly deep and the slender posterior end comparatively short and 

 without a hook-like curve (Fig. 15). 



The maxillary palpus measures 33/* laterally at the second joint and 

 is distinctly slenderer than the front leg ; in height this segment measures 

 45^. The flexor side of the same segment is concavely, the extensor side 

 strongly convexly, bent. The penultimate segment is on the whole 

 slightly curved and presents a tumid enlargement on the flexor side not 

 far from the proximal end. In the vicinity of this spot are two small 



