Juli 1887. 



No. 7. 





il. Jahrgang. 



Societas entomologica. 



->-;K-»"^f— 



Journal de la Société entomologique 

 internationale. 



Organ für den internationalen Organ for the International-Entomolo- 



Entomologenverein. gical Society. 



Toutes les eorrrsporuianres itrvrunt rhr aiii's^reis Alle Zuschriften an den Verein sin«! an lien Vcr- All letters l-u- llir Smiely are t(» lie direeteil tu Mr. 



à Mr. le président Fritz RUhl à ZuricllHottingen. stand desselben Herrn Fritz RUhl in Zürich- Hot- Fritz RÜhl at ZUrich-Hottingen. The linn, members nl 



.Messieurs les membres de Irt soeiétc sont priés d'en- tiligen /.u riehten. Die Herren Mitgllieder des Ver- the Society are kindly requested to send original 

 vnye. deseontribution50rif,'inalesi)ourla partieseienti- eins sind freundlieh ersucht, Originalbeiträge für i contributions for the scientific part of the paper, 

 licpie ilti journal. di-n wissenschaftlichen Theil des Blattes einzusenden. 



Tlie Fly Species on the Rovuina 

 ill Central Africa. 



By John Lewis. 



The river-sy.steni of tlic mighty lîovuniii is 

 oxfccilingiy varied in tlic dcvelopemeiit of its 

 Hor.i as well as in its rockformations. llolliiig' 

 hills rest the eye from the sight of vast and broad 

 valleys. ]\ich green forests, almost inaeccssible 

 on account of the thorny clinging vines stretch 

 far beyond the view and itlternate with hi.Kurious 

 and well cultivated jdantations. Caoutcliouc trees 

 and Stercularia stand alone along the hedges 

 which surround the Bangha and tobacco-plantations. 



The flies of these regions afford to the careful 

 observer a rich and instructive held of observation 

 in those districts not infested by the Tsetse tly. 

 Happily certain regions are free from this terrible 

 ennemy of the beasts of burden so needful to the 

 traveler. Where this fly is found in swarms the 

 e.xistancc of men and animals is endangered. 

 .Uready on the shores of lake Nangadi as well 

 as along the liver of the same name every twig 

 is covered with the Odontomyia species, a black 

 Oxycera is very frequent and the jN^emotelus species 

 are every where to be found. The neighborhood 

 of a settlement is generally betrayed by the pre- 

 sence of the Pangonia species which is easily 

 distinguished from the Tabanns. These bloodsiitdces 

 fall upon men and animals and give the traveler 

 no rest. They are specially noted for endurance 

 and rapidity inflight. Notorious are the : Tabanus 

 fasciatus F., auripunctatus F., vittatus F., carbo- 

 narius Mg. dorsivittata Walk., secedens Walk., 

 coiiformis Walk. Upon the Mandarin ]dants tliat 

 arc cultivated instead of potatoes, arc found 

 Thereva nubus Wieil. and Xcstomyza higubris 

 Wied. 



The fauna of tlie Kovuma is [ujor in species 

 of Hilaris and i*'mpis Init all the ritdicr in inilivi- 



duals. The clinging plants offer a goodly catch in 

 the way of Eumerus species which much resemble 

 European forms. Among these are found now and 

 then : Paragus and Ocyptamus species. On the 

 swamp-rceds a Rhingia, which is perhaps new, is 

 frequent. Myriads of Syrphus, such as S. nubus 

 Wied., incertus Wied., ericetorum F., Hit from 

 leaf to leaf. One can scarcely form an idea of the 

 busy life of the Eristalis which are found in great 

 quantities and together with the numerous Ilelo- 

 philus render the catching of other Dipteva diffi- 

 cult. Whenever the slaughter of a beast of burden 

 is rendered necessary by lack of fodder or over 

 exhaustion, the insect-life reaches its acme. In a 

 very few minutes the jiarts tlirown away are co- 

 vered with thousands of flies, hundreds of which 

 mav be cauglit if any one prepared with six or 

 eight nets can support the heat of the sun and 

 the bites of the flies. 



Zu Eurymene dolabraria. 



Von Aniidf ILillcr. 



]_)er im Mai und Juni fliegende Schmetterling 

 wurde wohl nocli nirgends in Mehrzahl beobachtet; 

 obgleich in Europa weit verbreitet, wird er allent- 

 halben einzeln gefunden, tadellose Exemplare sieht 

 man verhältnissmässig nur in wenigen Sammlun- 

 gen. Die meisten Stücke sind gefangene Thiere, 

 an Schönheit weit hinter den gezogenen zurück- 

 stehend, welche stets von Liebhabern und Samm- 

 lern begehrt sind. Die Zucht ist sehr leicht und 

 gibt bei entsprechender Pflege fast keine Verluste; 

 doppelt angenehm ist sie insofern, als keine die 

 Raupen dezimirende Ueberwinterung zu über- 

 stehen, und das Raupenleben kein längerdauern- 

 des ist. Am 12. Juni begann ein am U). dieses 

 Monats gefangenes schon gänzlich abgeflogenes 

 Weiiiclien mit der .Absetzung seiner Eier, es waren 



