218 THE CANADIAN ENTOMOLOGIST. 



The median dorsal surface of the segments, from side to side, is 

 sparsely, finely pubescent with simple hairs, the anterior margin and a 

 posterior interval glabrous. The anterior margin of the pronotum 

 extending forward, and the posterior margins of the eighth and ninth 

 dorsals of the abdomen extending backward, are densely fringed with 

 tapering bristles ; the posterior margins of the thoracic and abdominal 

 dorsals, except the last two, are similarly fringed with subdepressed clavate 

 bristles of equal length, of which seventy to eighty have been counted on 

 a segment ; behind and mostly hidden under the clavate bristles is a series 

 of fine simple hairs bordering the hind margins of the segments. The 

 anterior fringe of the pronotum affords protection to the junction of the 

 head, while the fringes of clavate bristles and subordinate hairs effectively 

 defend the membranous connection of the segments from dust or minor 

 enemies. At the narrowed lateral extremities of the second and third 

 thoracic and the first to second abdominal dorsal plates are spreading tufts 

 of tapering bristles. 



The spiracles are exceedingly minute and difficult of observation, the 

 thoracic pair, as usual, before and outside the middle coxse, the abdominal 

 at the sides, below and slightly anterior to the lateral extremities of the 

 dorsal plates. 



Coxai, femora and tibiae subequal in length, the coxse narrowing from 

 base, .the femora a little thicker outwardly, the tibiae slender and tapering 

 to apex and terminated with a slender claw, which, as well as the 

 trochanter, is about one-third as long as the other joints of the leg. 



The pupation of the female only has been observed. This takes 

 place within the larval skin just as in Aiithreiius. A middorsal rupture of 

 the skin frees the imago, leaving the delicate pellicle of the pupal envelope 

 within the larval moult. 



Both sexes of Igfiotus are apterous, and the female is without elytra. 

 The male has long slender antennae and legs, which are very much shorter 

 and weaker in the female. The surface is sparsely obsoletely punctate. 

 In the male the first two dorsal segments of the abdomen are paler and 

 membranous, the following semicorneous or coriaceous and piceous ; 

 ventral sutures straight, first ventral membranous and more or less con- 

 cealed at the middle, visible and of firmer texture at the sides ; second 



