130 THE CANADIAN ENTOMOLOGIST 



A PARTIAL KEY TO SPECIES OF THE GENUS AGRO- 



MYZA (DIPTERA.) 



Second Paper. 



by j. r. malloch, urbana, ill. 



The species included in the present key are distinguished from 

 their congeners by having the costa discontinued at or slighth- 

 beyond the apex of the third vein, and the hal teres yellowish or 

 whitish. 



The larval habits of very few of the species are known and 

 their known distribution indicates, not their actual range of oc- 

 currence but, rather, the fact that very little attention has been 

 paid to the group by collectors. The same fact is in evidence 

 throughout the genus. 



This group contains species placed by other authors in Napo- 

 myza Haliday, and Domomyza rondani. Melander records the 

 European species anomala Strobl. from Idaho and Washington. 

 I have not seen this species. 



1. Frons lemon-yellow; cross-veins very close together 2 



Frons red or black 4 



2. Lateral margins of mesonotum broadly pale yellow; anterior 



2 pairs of dorso-centrals much weaker than the posterior 

 2 pairs, the front pair much cephalad of suture. Food- 

 plant unknown. Montana; 



Idaho (brevicostalis Malloch) plagiata Melander. 



Lateral margins of mesonotum not yellow, coloured as disc 3 



3. Antennae black; length of costa from humeral vein to apex of 



first two-fifths as long as next section; third vein ending 

 little more than length of preceding section of costa be- 

 fore apex of wing. Larvae mining in Ranunculus ahor- 



tivus. Ind.; Ill davisi Walton. 



Antennee black; length of costa from humeral vein to apex of 

 first over three-fourths as long as next section ; third vein 

 ending over twice as far as length of preceding section of 

 costa from apex of wing. Larvae mining in Verbena, 

 Centaurea, etc., Col.; Ariz.; Alaska; 

 Europe lateralis Fallen 



April, 1918 



