204 THE CANADIAN ENTOMOLOGIST 



nal segment Ernestia s. str. 



Width of the parafacials equal to the length of the third antennal segment, 



i.e., parafacials unusually wide 3 



3. A median keel-like projection at the base of the inner forceps of the male 



genitalia, i.e. ; genitalia specialized _. Subg. Metaphyto 



No such projection, i.e., genitalia generalized Subg. Fausta 



Key To the Nearctic Species in the Subgenus Meriania. 



1. Third antennal segment black B. nigrocornca sp. n. 



Third antennal segment yellow or reddish 2 



2. Width of front in male equal to less than the length of the second antennal 



segment; parafacials very hairy in the male £. chalyhea Coq. 



Width of front in male equal to the length of the second antennal segment ; 

 parafacials in the male hairy on only the upper part and the hairs very 

 thin E. {Meriania) flavicornis Br. 



Key to the Maees oe the Nearctic Species of the Genus Ernestia s. str. 



1. Genitalia yellow or rufous 2 



Genitalia dark or black 3 



2. Width of the front at narrowest place less than the length of the second 



antennal segment ; inner forceps with a short keel flattened on one 



edge platycarina sp. n. 



Width of the front at narrowest point equal to or greater than the length 

 of the second antennal segment ; inner forceps without a keel and with 

 two conspicuous projections placed side by side ampelus Walk. 



3. Width of front at narrowest point fully twice as long as the second anten- 



nal segment , 4 



Width of front at narrowest point less than twice the length of the second 

 antennal segment 6 



4. Inner forceps with a conspicuous keel aldrichi Tn. 



Inner forceps without a keel 5 



5. Base of inner forceps with two conspicuous projections placed side by 



side fissicarina sp. n. 



Base of inner forceps without such projections frontalis sp. n- 



6. The fifth sternite with a deep incision on the lateral margin of each of the 



two prongs incisa sp. n. 



The fifth sternite normal   . . .7 



7. The inner forceps with a pair of short keels placed side by side 



bicarina sp. n. 



The inner forceps with a single keel 8 



8. The width of front as great or greater than the length of the second anten- 



nal segment johnsoni sp. n. 



The width of front less than the length of the second antennal seg-f 

 ment . 9 



9. Palpi black; the fifth tergum scarcely distinguishable from the first genital 



segment with which it is united nigropalpis sp. n. 



Palpi reddish, at least at tip; the fifth tergum clearly marked ofif, at least 

 laterally by a suture from the sixth 10 



10. Keel-like portion of the base of the inner forceps of unusual length, its dor- 



