1913] Agromyza and Cerodontha. 331 



"Individua plures adsunt colore toto et praesertim abdominis 

 dilutiore versimiliter immatura. " 



"Synes at forekomme temmelig almindelig langs hele Vestkysten 

 idet mindste op til 69° N. Br.; traeffes isasr i Pilekrattet, Larven lever 

 maaske i Pileblade. Igaliko-Fjord, Tunugdliarfikfjord, Tassiusak 

 Kristianshaab, Sydostbugten (Forf.). 



This species bears a resemblance to borealis described on a 

 previous page, the venation being almost identical in Lund- 

 beck's figure with that given in this paper for borealis, but his 

 description is lacking in several essentials, so that it is not 

 possible to say definitely whether the species are really the 

 same or not. 



Cerodontha Rondani. 



Syn: Cerodontha Rondani, Dipt. Ital. prod. Vol. IV, 1861, p. 10. 



Odontocera Macquart, Suit a BufiEon, Vol. 11,1835, p. 615 ''Preocc). 

 Ceralomyza Schiner, Wien. entom. Monatschr. Vol. VI, 1862, p. 434, 



Characters of the Genus. 

 Similar in most respects to Agromyza, but the third antennal 

 joint terminates, on the upper surface, in a thorn-like point. 

 The frontal and thoracic bristling is similar in nature to that 

 of Agromyza, but in no case have I seen more than two scutellar 

 bristles on the species I have examined; nor do I know of any 

 species in which more than two are present. The mid tibia 

 has no posterior bristles, and the costa always reaches to the 

 fourth vein. 



Cerodontha dorsalis Loew. 



Plate XXXI, Figs. 33, 39. 



Syn: Odontocera dorsalis Loew, Dipt. Amer. Sept., Indig., Cent. 1.. 1861, 

 species 99. 



Male and Female: Frons yellow, opaque, in breadth about one- 

 half that of head; orbits sometimes blackened, very narrow, on upper 

 half each not over one-sixth as wide as center stripe; three distinct 

 orbital bristles present, and on lower portions a few short hairs; procli- 

 nate ocellar bristles parallel, or slightly divergent, separated at base 

 by as wide a space as posterior ocelli; antennae yellow, third joint 

 black, one and one-half times as long as broad, ending in a thorn- 

 like point on upper side; arista black, distinctly thickened at base and 

 tapering to near its middle, pubescence indistinguishable, length of 

 arista short of twice the length of antennas; face yellow, slightly concave, 

 central keel rounded; cheeks yellow, higher posteriorly than anteriorly, 

 and at highest point about one-half as high as eye, marginal bristles 

 distinct; vibrissa strong, differentiated from marginal bristles; proboscis 

 and palpi yellow; occiput unprojecting on upper half. Meson otum 

 with disk entirely glossy black, with sometimes an indication of grayish 



