152 



THE CANADIAN ENTOMOLOGIST. 



unarmed in some species, but with spines in most, which are the stronger 

 upon the middle tibiae. Body robust, the abdomen as long as the head 

 and thorax united. Wings relatively small, stiff, the anterior ones tri- 

 angular, the posterior ones short, mostly produced at the inner angle, 

 particularly in the male. The anterior wings generally have a stigma, but 

 no costal fold ; and the tuft is absent from the tibiae. 



A. Club of antennae thick, with a sharp apical hooklet. Vein 2 



(i. e., the first branch of the median) of the fore-wings originates 

 much nearer to the base than to the hind margin of the wings, 

 and is almost twice as long as is the trunk of the median vein to 

 its end. Stigma of the male fore-wings in its normal position, 

 or absent (in the European species it is present). 



B. The last fifth of the elongated club of the antennae slender and 



bent backward, but rounded out at the end. Second vein as in 

 A. Male without the stigma. 



C. Antennae as in A. Vein 2 originates at, or a little before, the 



middle of the wing, and is not, or only a little, longer than the 

 trunk of the median. ' Stigma absent, or when present directed 

 more towards the outer margin and reaching only to the first 

 vein. 



D. Club of the antennae more slender and more fusiform, with acute 



but less sharply defined apical hooklet. The second vein starts 

 in the middle of the wing. _ Fringe light-colored ; at the end of 

 the veins spotted with dark color (in A B and C not spotted). 

 Male without the stigma. 



Our two common Central European species (Div. A) are typical of 

 this great world-wide genus, with which agree, in all essential characters, 

 such as structure of the antennae, neuration of the wings, etc., the greater 

 number (21) of the North American species known to me in nature. The 

 genus is far too comprehensive and varied to be left without analysis, but 

 this desideratum must await a general classification. In the length of the 

 antennae, the form of the club and its apical hooklet, in the spines of the 

 tibiae, cut of wings, in the presence or absence of the stigma, and in its 

 structure, manifold differences are displayed ; these, however, admit of no 

 arrangement into natural groups, if one would avoid shattering the genus 

 in an unwarrantable manner. The greater number of the species which 

 I have studied (including the American) have spines on the tibiae — in 



