THE CANADIAN ENTOMOLOGIST. 299 



contrary, the first abdominal segment may be long, but it is never coarc- 

 tate, and there is never a constriction between it and tlie second seg- 

 ment, the middle coxse are not quite so close together, and, as a rule, the 

 mesosiernal suture is distinct or represented by a strong carina which 

 separates the mesosternum from the mesopleiira. If this last character is 

 not present, other quite distinct characters separate them. 



The genera falling in this family may be distinguished by the use of 

 the following table : 



Table of Genera. 

 Cubitus in hind wings originating beyond the transverse median 



nervure 5- 



Cubitus in hind wings interstitial with the transverse median 



nervure 4- 



Cubitus in hind wings originating before the transverse median 

 nervure. 



Front wings with the second cubital cell receiving both recurrent 



nervures 2. 



Front wings with the first and third cubital cells each receiving a 

 recurrent nervure ; submedian cell a little shorter than the 

 median Mellinus, Fabr. 



2. Submedian cell a little longer than the median 3. 



Submedian and median cells equal, the transverse median nervure 



interstitial with the basal nervure, stigma not well developed, the 



radius originating from its apex Harpactostigma, Ashm., n. g. 



(Type H. velutinus, Spin.) 



3. Stigma well developed, rounded off at apex, the radius originating 



before its apex or near the middle, eyes very large, strongly con- 

 vergent anteriorly on the clypeus. 



First recurrent nervure received by the second cubital cell at its 

 middle ; abdomen with the dorsal segments depressed at 



apex Entomosericus, Dahlb. 



First recurrent nervure received by the second cubital cell before 

 the middle ; abdomen with the dorsal segments not depressed 

 at apex, normal Megalomma, Smith. 



4. Stigma only moderately developed, the radius originating from its 



apex ; submedian cell a little longer than the median ; second cubital 

 cell receiving both recurrent nervures ; triangular area of metathorax 

 well defined, striated ; scutellum with a crenulate furrow across the 



base. Hypomellinus, Ashm., n. g. 



(Type G. rufocinctus, Fox.) 



