1883.] 61 



M. MKDITATA, Fllll. 

 The arista has only sliort pubescence ; the nbdomen of the male is shorter and 

 more conical than in M. intermedia ; marked on the dorsum with four brown spots, 

 and furnished on the under-side of the penultimate segment with a very large pro- 

 jecting process ; the legs have tlu> coxoc, femora, and tarsi, all black, and the knees 

 and tibisD yellow. Rare. 



M. MEANS, Mcig. 



This species is very similar in form to M. intermedia, but is smaller (1 mm.) ; 

 the arista is sub-plumose ; the abdomen immaculate ; alulets rather small, but with 

 unequal scales ; the legs are entirely black, with the exception of the knees and the 

 proximal thirds of the fore femora, which are yellow. Not common. 



(To be continued). </. '/] /i'^, A^Y-^O 



FURTHER INFORMATION AS TO THE MIGRATORY HABITS OF THE 

 GALL-MAKING APHIDES OF THE ELM. 



BY JULES LICHTEXSTEIN. 



My good and learned friend, Professor Ilorvath, Director of the 

 PhyUoxera station in Budapest, is an eminent Hemipterist, well known 

 from his many good works on the Ilemiptera-IIeteroptera. He has 

 now lately entered on the study of the Ilomoptera also, and has made 

 such good ])rogress that he became in a few years the first authority 

 in his countr}' for the knowledge of the Phylloxera, and was appointed 

 director to the Phylloxera station of Hungary. 



When I had the pleasure of seeing him here, I called his attention 

 to my new ideas on the evolution of plant-lice from galls, and asked 

 his good aid to support me against some of my adversaries in Paris, 

 who consider, as a poetical fancy, my theories of migrations from 

 plant to plant, or even from galls on trees, like elms or poplars, to 

 grass roots. 



Prof. Horvath is a sharp observer, and deserves more than any 

 one the adjective of " oculaflssiinus,''' so often employed in entomology. 

 Thus, I had the pleasure, soon after having charged him with that 

 work of observation, to see in a French entomological paper (Revue 

 Francaise d'Entomologie, April, 1883) a note from Horvath announcing 

 that my theories were deserving of full confidence, for he had atten- 

 tively observed the root-louse of the Zea ma'is {Pemphiqus zeoe-mdidis, 

 L. Dufour, after F. Low), and had arrived at the conviction that it 

 flew from the maize-roots to the trunks of the elm trees where it de- 

 posited the sexual forms. 



Of course, I was highly pleased with this discovery, much more 



