REPORT OF THE STATE ENTOMOLOGIST- I907 2// 



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 Ixarded 



c Foremetatarsus not over i^^ times the tibia in length 

 7 Abdominal segments black, posterior margins sometimes gray, 

 not yellow 

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

 ments with faintly grayish margins niveipennis 



()(j Foremetatarsus i i/S or more times the tibia in length 



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



of the third Clegs fuscous; var. meridionalis) 



h y p e r b o r e u s 

 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 m'ore yellowish, smaller species 



7.5 to 9 mm in length prasinus 



cc Foremetatarsus over 13/3 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 a 1 1 e n u a t u s 



dd Foretarsi of the male not bearded 



c Male claspers unusually stout, foremetatarsus i^ times the tibia 

 in length ; abdominal segments gray, margined with yellow ; 



legs yellowish 



cc Male claspers slender 



/ Foremetatarsus about \Vj, times the tibia in length; black species, 

 legs blackish, abdominal segments with cinereous margins... 



s t a e g e r i 

 // Foremetatarsus over lYi times the tibia in length 



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

 times yellow ; abdominal segments black, posterior margins 



gray; foremetatarsus i3-/> times the tibia in length 



r i p a r i u s 

 gg Not as above in all particulars 



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



i^ times the tibia in length s i m i 1 i s 



hh Species 5 mm or more in length 



i Middle and iiind femora each with broad yellow band 



before apex c o m p e s Coq. '08 



i\ Legs not so marked 



y With foremetatarsus about xYj times the tibia in length; 



6.5 to 8 mm in length c r i s t a t u s 



yy With foremetatarsus about 1.6 times the tibia in length; 

 length 6 mm redeuns? 



