92 THE CANADIAN ENTOMOLOGIST. ^. 



middle legs yellowish, fleeced with reddish-brown. Antennae dusky 

 paler at base. 



Length of antenna: ^ 5.5 to 7 mm., 9 6.8 to 7.5 mm. 



" " head and pronotum : (J 6 to 7 mm., $ 6.8 to 8 mm. 

 " " hind femora : ^ 9 to 9.5 mm., 9 10 to 12 mm. 



" tegmen : (^ 3 to 3.5 mm., ? 3.5 to 5.5 mm. 

 " " body: (^ 14.5 to 16.7, 9 20 to 24 mm. 



This species is very closely allied to Af. manais, Smith, from which 

 it can be distinguished as follows : In maiiais the cerci of the male are 

 much longer than in abortivus, reaching quite to the end of the supra-anal 

 plate, sometimes beyond it, while in abortivus they are always distinctly 

 shorter. In manais they are fully twice as long as broad, generally more 

 than this, the apex considerably expanded and distinctly incurved ; the 

 furcula is much longer than in abortivus^ being a fourth as long as the 

 supra-anal plate, while in the latter they are never more than one-sixth as 

 long. In abortivus they are about as broad as long, slightly convergent 

 and constricted in the middle, while in tnancus they are distinctly longer 

 than broad and somewhat divergent. The females aie extremely difiicult 

 to separate from those of mancus, there being scarcely one permanent 

 distinguishing character. 



The lateral carinas of the pronotum are more prominent in abortivus^ 

 there being a distinct angle between the dorsum and lateral lobes, while 

 in ftiancus this angle is rounded off. In abortivus the posterior margin 

 of the pronotum is more or less angulated with the lower margin, in 

 mancus there is generally no semblance of an angle here. 



Described from fifty-five specimens, of which twenty-five are males 

 and thirty females. Most of these were taken at De Grassi Point, Lake 

 Simcoe, Ontario, and in neighboring localities. The only other locality 

 where I have seen it is Aurora, Ontario, about 22 miles further south. 

 It is found in openings in rich shady woods and on their borders, 

 especially where the timber is of a coniferous growth. I have found it 

 most common in paths in swampy woods composed of spruce, balsam fir, 

 tamarack, paper birch, etc. Seldom more than one or two are seen at 

 once, though by diligent search specimens can be secured any day during 

 the proper season, which lasts from the first week in July, or a little later, 

 to the beginning of October. The earliest date upon which I have taken 

 a specimen is July 2, 1896. 



Figures of this species will appear later, in connection with my 

 " Notes on Some Ontario Acridiidse." 



