DR. J. C. H. DE MEIJERE, STUDIEN ÜBER ENZ. 1 85 



apparently thus thrusting their eggs into the backs of the 

 beetles through the thin dorsal skin beneath the wing-covers. 



The tip of the abdomen of the female fly is admirably 

 adopted to this object, being hard and subconical, and 

 directed downwards at a right angle to the axis of the bod}'. 



The relations of these insects were experimentally deter- 

 mined by confining, June 9, 1906, adult Ma}--beetles in a 

 breeding cage with several of the flies. These would light on 

 the backs of the feeding beetles, which would at once drop 

 to the ground with the flies clinging to them. Whenever a 

 beetle spread its wing for flight the insect on its back inserted 

 the tip of its abdomen between the May-beetles' wing, evidently 

 depositing an egg in its back. Beetles so treated lived for 

 some days and then began to die. On the 2']^'^ of June, 

 five of the beetles were dead, and in the bodies of two of 

 these, dipterous maggots were found. July 10, three of the 

 beetles contained each a dipterous puparium, which remained 

 unchanged until May of this year (1917), when all produced 

 adults of Pyrgota undata. The puparia of these parasites 

 are dull black, broad ovate, widest at the posterior third. 

 At the tip is a small shallow excavation encircled by a rugose 

 ridge, which is elevated latero-dorsalh' into a pair of short 

 irregular tubercles, the tips of which are about a millimeter 

 apart. Length 7 — 8 mm.; greatest diameter 4.5 — 4.8 mm.; 

 diameter of anterior end, about 3 mm." 



Es freute mich besonders, dass vor kurzem einer der in 

 Niederländisch-Indien tätigen Entomologen mir einige Fliegen 

 zur Bestimmung sandte, welche er aus javanischen Lamelli- 

 corniern gezogen hatte und in welchen ich gleich eine 

 Caiupylocera, also gleichfalls eine Pyrgotine, erkannte. 



Es handelte sich um Campyloccra robusta V. D. WuLP. 

 (Tijdschr. V. Entom. Bd. XXIII, p. 190, XXVIII, p. 218). 

 Herr VAN DER GOOT, wem ich die Tiere verdanke, schrieb 

 mir, dass er sie aus Adoretus compi'essiis gezogen hatte ; 

 bei einer ziemlich grossen Anzahl der gefangenen Käfer 

 konnte er nach einiger Zeit die Puparien dieser Fliege, welche 

 das ganze Abdomen ausfüllten, auff'inden. Auf meine Bitte 

 war er so freundlich, mir später auch einige leere Puparien 

 zuzusenden; die Gelegenheit, näheres über die früheren Stände 



