Vol. xxiii] ENTOMOLOGICAL NEWS 463 



New North American Diptera. 



By W. R. WALTON, Bureau of Entomology, 

 Washington, D. C.* 



Agromyza davisii n. sp. (AGROMYZIDAE). 



Length 2 mm. Front, cheeks and proboscis yellow. Antennae, 

 palpi, occiput and ocellar triangle black. Thoracic dorsum, scutellum 

 and pleurae opaque blackish, strongly bristled. A line over the meso- 

 pleura pale yellow. Abdomen black, somewhat shining, sutures pale 

 greenish yellow. Genitalia shining black. Legs and feet entirely 

 black. Squamae, halteres and bases of wings yellow. 



This species belongs to Meigen's group "C" (c) in which 

 the cross veins are approximated and confined to the basal 

 fourth of the wing, front yellow. 



Described from two specimens, male and female, reared 

 from the leaves of Ranunculus abortiviis, in which it mines, 

 by J. J. Davis, Lafayette, Indiana, and in honor of whom it is 

 named. 



Type deposited in U. S. Nat. Museum, Washington, D. C. 



Microdon craigheadii sp. nov. (SYRPHIDAE) 



Microdon laetus Walton (not Loew), Ent. News, XXII, p. 319, 191 1. 



In Vol. xxii, p. 319, of ENTOMOLOGICAL NEWS the author 

 published a note on Microdon laetus Loew. Additional mate- 

 rial has since been received and in going over this, in com- 

 parison with a specimen in the U. S. National Museum which 

 is labelled "M. laevis Loew," the two forms are evidently 

 abundantly distinct. Now as there is no such species as "M. 

 laevis Loew," and as the specimen referred to above agrees 

 closely with Loew's description of laetus and is furthermore 

 from Cuba, the type locality of laetus, it becomes obvious 

 that the Pennsylvania specimens constitute a new species to 

 which the name Microdon craigheadii is herewith given. To 

 the previous description (/. c.. p. 320), the following details 

 may be added: 



Male. Head about as wide as thorax, face three-quarters as 

 wide as eye ; eyes nearly bare. 



*Published by permission of Chief of Bureau. 



