Dec, 1920 Bulletin of the Brooklyn Entomological Society 147 



A NEW GENUS OF AGROMYZIDiE (DIPTERA). 



By J. R. Malloch, Urbana, Ills. 



The species described herein has been in my possession for 

 four years, but I have delayed publication of the description as it 

 was my intention to publish at the same time a key to the species 

 of the genus Agromysa which have the knobs of the haheres 

 black and the costa continued to apex of fourth vein. An ex- 

 amination of the specimens discloses the fact that the species may 

 l)roperly be removed to another genus and I therefore describe it 

 as the type of a new genus. 



The species of Agromysa with black halteres have recently been 

 removed from Agromysa by Hendel. Those with a median facial 

 keel are placed in Ophiomyia Braschnikow, with the genotype 

 curvipalpis Zett., and those without a facial keel in Melana- 

 gromyza Hendel, with the genotype ceneiventris Fallen. From 

 both of these genera the one now described may be separated by 

 its hairy frontal lunule. 



It may be pertinent to note here that Hendel has indicated that 

 hurgessi Malloch is in his opinion a synonym of mieiventris. 

 This is not so, but it is not at all improbable that virens Loew js 

 as it runs down to ceneiventris in Hendel's key while hurgessi does 



" hot. 



* Limnoagromyza gen. n. 



Generic characters : Similar to Melanagromysa Hendel, with 

 black halteres and no presutural dorsocentral. The eyes are 

 bare in both sexes, and there are some microscopic hairs on 

 the frontal lunule which I have not seen in any other speceis 

 of the old genus Agromysa. 



Genotype, the following species. 



Limnoagromyza diantherae sp. n. 



Male and female.— Glossy black. Interfrontalia opaque 

 black ; orbits, lunule, and face slightly pruinescent. Dorsum of 

 thorax and abdomen with a slight bluish or greenish metallic 

 tinge. Legs entirely black. Wings slightly suffused with 

 brown, veins bark brown and conspicuous. Halteres black. 

 Calypt'rffi and their fringes white. Ocelli in an almost equi- 

 lateral triangle, the bristles long ; each orbit with 4 or 5 bristles 

 and, laterad of these, with dense short hairs which are not 



