192 THE ENTOMOLOGIST. 
It is, however, in a species not found with us that Dr. 
Weisman has made the greater number of experiments, and 
arrived at some most interesting and instructive results. 
Araschnia Levana is the winter and probably original form of, 
the species which has been differentiated into Araschnia Prorsa 
as the summer form, and often intermediate specimens are 
produced which are known as A. Porima. For the details of 
these experiments the work should be referred to; they appear 
to have been carefully made and faithfully recorded. 
We look forward with pleasure to the completion of the work 
by the publication of the second and third parts.—J. J. W. 
——— 
OBITUARY. 
THEeopor Hartric.—The ‘ Entomologische Nachrichten’ for 
July 1st contains an obituary notice of this worthy Brunswick 
entomologist. From it we learn that Theodor, son of chief 
ranger Georg Ludwig Hartig, was born at Dillenburg on the 
2lst of February, 1805. In 1833 he was appointed professor 
of forestry in the University of Berlin, but removed to the 
Collegium Carolinum of Brunswick in 1838, where he worked 
hard and to his own great honour for forty years. He died, after 
two days’ illness, on Good Friday last (26th March), in the 
seventy-sixth year of his age. Hartig’s name has frequently 
occurred in the pages of this journal both in connection with the 
translation of Vollenhoven’s life-histories of sawflies, and as 
sponsor to the greater number of Cynipide in the translation of 
Mayr’s work on the European oak-galls. His chief works, all 
remarkable for their scientific method and accuracy, are ‘Die 
Familien der Blattwespen und Holzwespen’ (Berlin, 1837), and 
‘Hinleitung zur Naturgeschichte der Hymenopteren’ (Berlin, 
1860); his three papers on “ Die Naturgeschichte der Gallwespen,” 
in Germar’s ‘ Zeitschrift fur die Entomologie’ (vol. i1., pp. 176— 
209; ill, 322—358; iv., 895—422: Leipzig, 1840—3), and his 
attempt at the classification of the Aphidide (plant-lice) according 
to their wing-characters, which also appeared in the same publi- 
cation (vol. iil., pp. 359-376, 1841). The earlier volumes of the 
Stettin ‘Zeitung, and many other entomological and botanical 
serials, also contain important memoirs from Hartig’s pen; the 
Royal Society’s Catalogue indexes seventy, published between 
1885 and 1871.—E. A. F. 
