340 



Key to Species 



1. Wings with distinct black spots or bands 2 



— Wings without spots or bands 3 



2. Wings with 3 black spots or bands; male with fore and mid tarsal 



claws equal, the hind pair very unequal in length. ... 1. nehulosa. 



— Wings with 2 black spots (PI. XXII, Fig. 11) ; male with claws of 



all tarsi subequal 2. picta. 



3. Thorax yellow or green .4 



— Thorax black 5 



4. Thorax and abdomen green, the latter with a transverse pair of 



elongate black spots on segments 3 to 5 ; all tarsal claws unequal 

 3. viridis. 



— Thorax and abdomen yellow, unspotted ; all tarsal claws minute, 



subequal 4. gilva. 



5. Small species, 1 mm. ; third vein fused with first on its basal fourth ; 



petiole of media slightly shorter than cross vein, tarsal claws mi- 

 nute, subequal 5. arctica, 9 . 



— Larger species, 1.5 mm. ; third vein connected with first by the nor- 



mal cross-vein ; petiole of media longer than cross vein ; tarsal 

 claws of female very unequal 6 



6. Abdomen and halteres black ; last joint of all tarsi with a transverse 



pair of blunt spines near base on ventral surface. . 6. anteniialis. 



— Abdomen and halteres pale 7 



7. Abdomen green; last joint of all tarsi with a pair of spines near 



base on ventral surface 7. diversn. 



— Abdomen yellow; last tarsal joint without spines. . 8. pallidiventris. 



I. Hartomyia nebulosa Coquillett 



Ceratopogon. nehulosus Coquillett, Proc. U. S. Nat. Mus., Vol. 23, 1901, p. 606. 

 Johannseniella nehxilosa Malloeh, Bull. 111. State Lab. Nat. Hist., Vol. 10, Art. 4, 

 1914, p. 226. 



This species is described by Cociuillett as having the "thorax black, 

 mesonotum opaque, densely gray pruinose and marked with large, 

 mostly confluent spots and isolated brown dots ; scntellum yellow, fore 

 corners brown." The wings have three brown spots or bands as fol- 

 lows : "the first near center of basal cell, the second beginning at basal 

 part of vein 3 and extending to apex of lower branch of fifth, the last 

 beginning on costa beyond apex of vein 3, and extending into second 

 posterior cell, also a small brownish spot near center of anal cell." The 

 media forks slightly beyond the cross vein. Halteres white. 



Length, 2 mm. 



Originally described from a male taken in New Jersey. Has not 

 been taken in Illinois to my knowledge. It probably occurs in this 



