308 THE CANADIAN ENTOMOLOGIST. 



submargin ; scutellum with the basal angles, a median line and two 

 discal dots fuscous ; elytra smoky subhyaline, the nervures darker, 

 interrupted with light ; legs light, all the femora and tibiae lineate 

 with fuscous on the outer (upper) faces. 



Described from twenty-four examples from the mountains west of 

 Fort Collins, Ward, Palmer Lake, Marshall Pass and Lizard Head, Colo. 

 The larger size and darker face will distinguish the female of this species 

 from alternatus ; the enlarged femora render the male quite distinct in 

 the genus. 



Idiocerus ensiger, n. sp. 



Size and form of alternatus nearly, slightly longer, but with a 

 remarkably long ovipositor in the female. Colour pale chestnut and 

 white. Length, 5.25 mm.; width, 1.8 mm. 



Face moderately convex, retreating from the narrow vertex, front 

 short, broad, sharply angulate at antennae ; elytra with a moderately long 

 outer anteapical cell. Female segment moderately long, transverse, the 

 posterior margin straight ; ovipositor as long as the rest of the body, 

 exceeding the long pygofers by more than one-third, sometimes almost 

 half, of its length. 



Colour: vertex and face pale chestnut, a pair of small spots on 

 vertex and the ocelli dark ; pronotum and scutellum chestnut, the basal 

 angles of the latter sometimes dark ; elytra subhyaline, with a pale 

 cinnamon-brown reflection, a few of the nervures darkened and usually a 

 light stripe along the suture, which may be emphasized as a pair of spots or 

 continued as a stripe on the pronotum. 



Described from nine females taken at Home and Dutch Georges, 

 both mountain places on the Poudre River, Colo. Very few species of 

 Idiocerus are sufficiently distinct to be described from one sex alone, 

 especially the female, but the remarkable sword-like ovipositor of this 

 species would seem to warrant that distinction. 



Idiocerus nutsteus, n. sp. 



Form and structure of femoratus, but smaller. Dull cinereous, 

 clouded with pale olive and brown, a pair of spots on the vertex and 

 usually a few marks on pronotum and scutellum. Length, 5 mm.; width, 

 1.8 mm. 



Face but slightly convex, very deep, margins of genae straight 

 or slightly emarginate, not angled ; elytra long, narrow at apex ; nervures 

 with setigerous punctures ; outer anteapical cell long and narrow. Female 



