THE CANADIAN ENTOMOLOGIST. 207 



Family VI., Lydid^. 



The genera in this family have been revised recently by Mr. F. W. 

 Konow,* who treats the gr()ii[) as a tribe, dividing it into t\vo subtribes, (i) 

 Megalodontides and (2) Lydides. He recognizes eight genera, but some 

 of these he again divides into subgenera. 



Believing that these insects represent a distinct family, I have here 

 recognized his subtribes as subfamilies, and his subgenera as genera. 



In my table of families I overlooked the fact that the Megalodontides 

 (exotic species) had no distinct intercostal vein, so that line 2, page 144, 

 should be amended to read : Costal cell most frequently with an inter- 

 costal cell. 



The following tables are based mainly upon those of Konow's, 

 although I have made some changes, and used some characters not 

 mentioned by him, which, it is believed, will render the genera much 

 more readily distinguishable. All of them are known to me, except 

 Melanopus and Tristactiis. 



Table of Subfamilies. 



Head usually without the two longitudinal grooved lines on the vertex, 

 or with only traces of them ; antennas with the middle joints de- 

 pressed or concave beneath, with more or less distinct branches 

 or processes ; front wings without an intercostal vein, or it is only 

 indicated by a streak ; cubitus originating from the middle of the 

 basal nervure ; second dorsal segment of abdomen entire, without a 

 median slit ~ Subfamily I., Megalodontina?. 



Head always with two distinct longitudinally grooved lines on vertex ; 

 antennae filifoim, simple; front wings with an intercostal vein; 

 cubitus originating from the apexf of the basal nervure or from the 

 costal vein ; second dorsal segment of abdomen emarginate or with 

 a median slit Subfamily II., Lydinas. 



Subfamily I. — MEOALODONTiNi^.. 



This group or subfamily, so far as I know, has no representative in 

 our fauna. It is more particularly confined to the Asiatic fauna, a few 

 species only being found in Europe, while but a single species has been 

 recorded from Africa. 



*Annelen des K. K. Naturh. Ilofm., XII., 1897, Heft I. 



tKonow says from tfie base, l)iit in this lie is in error, since tlie basal nervure in 

 reality represents a fork of the median vein and originates from that vein and not from 

 the subcostal vein, as his language would seem to imply. 



