66 



As my observation is i)ublis]ied in two Transactions, perhaps 

 usually quite inaccessible, I repeat the substance of it in these pages. 

 In "Correspondenzblatt cles naturforschenden Vereins zu Riga, Jahrg. 

 XI, ,1859, p. 147" is printed a part of my letter, dated July 7., to 

 the Eev. Mr. Kawall, and in "Landwirthschaftliche Jahrbuecher aus 

 Ostpreussen, Koenigsberg, 1859, Jahrg. XI, July — Aug. p. 344", is 

 printed a short report by myself on the subject. I had namely 

 received stalks containing the pupa of destructor and I placed them 

 in glass tubes well corked in order to rear and observe the perfect 

 insect. In one glass tube, containing only one pupa, a female hatched 

 out and laid about 100 eggs, and died the same evening. The eggs 

 were fixed to the glass and were perfectly diaphanous. During the 

 first 23 hours I remarked some change in the eggs which led me to 

 hope for a development of the emljryo. The changes continued 

 through a whole week and showed the unmistakable development 

 and transversal segmentation of the embryo. Unfortunately^ the tube 

 was one day left for some time exposed to strong sunlight, and then 

 the development stopped. But the transversal lines of the segments 

 were still visible in 1861, when I had the pleasure of showing the 

 eggs to Professor von Siebold. At this time Wagner's discoveries 

 were not yet made public, while Parthenogenesis itself has only since 

 a few years been generally recognized, through the admirable works 

 of V. Siebold, and this for but few insects, not Diptera. I have had 

 no opportunity since that time to renew my observation. If C. 

 destructor becomes again common, I believe the observation could be 

 easily repeated. This is the only reason which induces me to draw 

 attention again to my old and overlooked discovery. 



A new Eustpotia. 



By A. E. Grote. 

 Under the number 738 (pink label) Mr. Belfrage sends me 

 a fresh specimen of a species of .Eustrotia, closely allied to our 

 well known northern concinnimacula of Guenee. The specimen 

 was taken March 23, and is about the same size as its ally. It 

 is of a uniform pale green, and the markings and color of its 

 close ally, but it differs notably as follows : The ordinary spots 

 are greatly reduced ; the black mark surmounting tlie orbicular is 

 more distinct and definite. [The large reddish, rounded clariform 

 which, in concinnimacula, is approximate to the orbicular, is here 

 reduced to a small rounded point, situated on the submedian and 



