REPORT OF THE STATE ENTOMOLOGIST I907 277 



c Wings smoky, especially along the course of the veins, veins reddish 

 brown, including the cross vein, end of knob of the halteres brown; 

 (new name for caliginosus, which is preoccupied for fossil 



species) ithacanensis new name 



cc Wings hyaline, with brown cross vein 

 d Forestarsi of the male bearded 



e Foremetatarsus not over i^ times the tibia in length 

 7 Abdominal segments black, posterior margins sometimes gray, 

 not yellow 

 g Foremetatarsus i^ times the tibia in length, abdominal seg- 

 ments with faintly grayish margins niveipennis 



gg Foremetatarsus i 1/5 or more times the tibia in length 



h Legs black, fourth tarsal joint of foreleg about ^ the length 



of the third flegs fuscous ; var. meridionalis) 



hyperboreus 

 hh Legs subfuscous, third and fourth tarsal joints subequal in 



length annularis 



// Abdominal segments with yellowish posterior margins 



g Ground color of the thorax gray, stripes blackish, humeri 



yellowish, large species 9 to 12 mm in length. .p 1 u m o s u s 



gg Ground color of the thorax more yellowish, smaller species 



7.5 to 9 mm in length prasinus 



ee Foremetatarsus over i^ times the tibia in length 



/ Halteres yellow m a t u r u s n. sp. 



// Halteres dusky, third and fourth tarsal joints of the forelegs 



subequal in length attenuatus 



dd Foretarsi of the male net bearded 



e Male claspers unusually stout, foremetatarsus 1^4 times the tibia 

 in length ; abdominal segments gray, margined with yellow ; 



legs yellowish 



ee Male claspers slender 



/ Foremetatarsus about i^ times the tibia in length; black species, 

 legs blackish, abdominal segments with cinereous margins... 



s t a e g e r i 

 // Foremetatarsus over i^ times the tibia in length 



g Thoracic stripes black divided by gray lines, humeri some- 

 times yellow ; abdominal segments black, posterior margins 



gray; foremetatarsus i^ times the tibia in length 



r ip a r i u s 

 gg Not as above in all particulars 



h Small species, 3 to 4 mm in length; foremetatarsus over 



lYz times the tibia in length similis 



hh Species 5 mm or more in length 



I Middle and hind femora each with broad yellow band 



before apex compes Coq. '08 



i\ Legs not so marked 



y With foremetatarsus about i>^ times the tibia in length; 



6.5 to 8 mm in length cristatus 



yy With foremetatarsus about 1.6 times the tibia in length; 

 length 6 mm redeuns? 



