THE CANADIAN ENTOMOLOGIST. 117 



Meromyza flavipalpis, n. sp. 



Similar in coloration to pratorum var. americana Fitch, the 

 palpi being entirely yellow. It differs from that species as indicated 

 below : 



Length of lower cheek margin barely equal to height of an- 

 terior profile of head, and barely two-thirds as long as height of 

 head at vertex; face distinctly retreating in 

 profile flavipalpis, n. sp. 



Length of lower cheek margin about l^ times height of an- 

 terior profile of head, and slightly more than equal to height of 

 head at vertex; face but slightly retreating, concave in 

 centre pratorum Fallice. 



In addition to the above flavipalpis is considerably larger than 

 pratorum, 4.5-5 mm. as against 2.5-3.5 mm. 



Locality of specimens of flavipalpis: Champaign, Illinois, June 

 22, 1888, two males (Marten and Hart). 



Type: Illinois State Lab. Nat. Hist, collection. 



Chloropisca Loew. 



There is present on the postero-dorsal surface of the hind tibia 

 in the species belonging to this genus an elongate oval, flattened 

 area, which occupies about two-thirds of the length of the tibia. 

 This area is slightly depressed and thickly covered with closely set, 

 short hairs, which leads me to consider that this area is the seat of 

 some sensory organ. I have examined examples of the following 

 genera and find that this organ is present in varying extent in: 

 Chloropisca, Pseudochlorops, Crassiseta, Melanochceta, and Botanobia, 

 and absent in the species I have examined in Elliponeura, Ecte- 

 cephala, Meromyza, Neodiplotoxa, Diplotoxa, Chlorops, and Epi- 

 chlorops. 



The amount of material available to me at present is not such 

 that I can form any distinct idea of the significance of this organ 

 in the classification, nor do I know what the organ may have as 

 its function; but it is not improbable that it may prove of con- 

 siderable value in classifying this rather closely allied group. It 

 appears rather strange to me that Chloropisca, which has very 

 much the general habitus of, and is very similar in food habits to 

 Chlorops, should have this organ well developed, whereas the latter 



