186 ENTOMOLOGICAL NEWS [June, '22 



The University of Michigan- Williamson Expedition to Brazil. 



Mr. Jesse H. Williamson's letters from February 13 to March 1 

 state that Captain Strohm and he were still at Porto Velho, Brazil 

 (see the NEWS for April, page 104). There was much rain and the 

 opinion was expressed that there would be no collecting along or near 

 the big rivers till they dropped 30 or 40 feet. On March 1 they esti- 

 mated their collections of insects as comprising 2000 specimens of 

 Odonata of S3 species and a few ants, beetles, grass-hoppers, crane- 

 flies and cicadas; also a few spiders. 



On March 5 they left Porto Velho by the Madeira-Mamore Railway 

 for Abuna, 220 kilometers to the southwest, in the State of Matto 

 Grosso. This place is given as Abunan on the National Geographic 

 Society's map ; its official name is Presidente Marquez ; it likewise is 

 on the Madeira River. At first there were only light showers here, 

 but after a week heavy rains fell putting even the woods trails a foot 

 or more under water. 



On March 15, Drs. Mann, Pierson and White of the Mulford Explor- 

 ation arrived in Abuna, on their homeward way, and continued their 

 journey to Porto Velho the next day. A "gab fest" between the two 

 expeditions is reported. 



In spite of the unfavorable weather their Odonata numbered 2945 

 specimens on March 14 and 3616 on March 26. 



On March 27 they continued up the railway to Villa Martinho, where 

 there is no hotel as at Porto Velho and at Abuna, and found quarters 

 in a restaurant. Villa Martinho is 93 kilometers from Abuna. In these 

 river towns the railway is the only foot highway. 



A Request for Exchanges with Russia. 



The Permanent Bureau of Ail-Russian Entomo-Phytopathological 

 Congresses, Liteyny, 37-39, Room 59, Petrograd, Russia, desires : 



1. To exchange printed matter (published since 1914) on ento- 

 mology, phytopathology, mycology and zoology, with American Col- 

 leagues, Scientific Societies, Agricultural Experiment Stations, Museums 

 of Natural History, Periodicals, etc. 



2. To receive from American publishers catalogues and specimen 

 numbers of various publications on the above mentioned subjects. 



3. To receive catalogues and price-lists from American firms dealing 

 in various apparatus and chemicals used in combating the plant injurers. 



The above mentioned Permanent Bureau has supplied credentials to 

 Mr. D. N. Borodin (who also represents the Bureau of Applied Botany 

 of the Russian Agricultural Scientific Committee, Petrograd) to collect 

 literature in this country and give all the necessary information t 

 American Colleagues, concerning the entomological work conducted in 

 Russia and to organize an exchange of literature. 



Air. Borodin will accept all packages of books, bulletins, etc., for 



