THE CANADIAN ENTOMOLOGIST. 115 



The measurements given are taken from mature examples from the 

 Isle d'Orleans, P. Q., as my Ontario ones, if full-grown, are rather 

 undersized. 



I fotmd this species in considerable numbers on the Isle d'Orleans, 

 under flat stones at the bottom of a wooded hill. They were associated 

 with C. terresiris. 



The best character for distinguishing the males of this species from 

 those of the other species of this region is the emarginate hind margin of 

 the 9th dorsal segment and the peculiar shape (PI. IV., fig. i) of the sub- 

 genital plate. The fore femora are frequently more than a third longer 

 than the pronotum. 



24. Ceuthophilus pallidipes, sp. nov. 



Of medium size ai?d moderately stout. Fore femora no stouter than the 

 middle pair, one third or a little more, longer than the pronotum, and about 

 three-sevenths the length of the hind femora. Fore tarsi faintly or no 

 longer than the pronotum, rather slender. Middle femora with 1-3 spines 

 on the front carina, and with 0-3 on the hind besides the genicular spine. 

 Hind femora about as long as the body, moderately stout, about 3}^ 

 times as long as broad, the upper margin more convex than the lower, 

 which is nearly straight in its proximal half A very few raised points 

 usually present on the upper part of the inner surface. Inferior sulcus 

 very narrow, except at apex, rather deep, rounded when not altered in 

 shape by drying. The spines on the outer and inner carinse in the male 

 are very variable, both in number and size, but are never conspicuous. 

 There may be from 10 to 18 on the outer and 8 to 15 on the inner, but 

 are usually 12 or 13 on each. They are nearly equal in size, and more or 

 less irregularly scattered over the apical half or two-thirds of each carinae. 

 In the female there are about the same number, or fewer, very minute and 

 delicate spines distributed in a similar manner. Hind tibiae faintly longer 

 than the femora, moderately slender, the spurs longer than the tibial depth, 

 usually set at an angle of 60° or 70° with the tibiae, but very variable in 

 this respect. Inner middle calcaria nearly or quite as long as the first 

 tarsal joint. Extremity of male abdomen slightly swollen, the 9th dorsal 

 'segment somewhat upturned and produced into a short truncate su|)ra- 

 anal plate, its corners well rounded. Subgenital plate of male large, 

 convex and upturned, divided by a deep median fissure into two spoon- 

 shaped lobes, which slightly overlap in the middle line. Each lobe is 

 about one-half longer than broad, its upper margin nearly straight, 



