xxxiii, '22] ENTOMOLOGICAL NEWS 11 



Mesonotal praescutum silvery gray with three conspicuous black 

 stripes, the broad median stripe divided by a slight carina; scutal lobes 

 black, the median area pminose ; scutellum black, more pruinose 

 basally. Pleura light gray. Halteres dark brown, the base of the stem 

 obscure orange. Legs with the coxae and trochanters obscure yellow ; 

 remainder of the legs brownish testaceous, the terminal tarsal segments 

 darker. 



Wings grayish subhyaline; veins dark brown; wings very large and 

 ample for the size of the insect ; anal angle very conspicuous. Vena- 

 tion : Rl thick with numerous short macrotrichiae ; the section of Rs 

 interpreted as being a spur in E. chilcnsis is here so long and of such 

 a course that it appears to be the true base of the sector, although the 

 extreme basal connection is atrophied ; the vein that was interpreted 

 as the base of the sector in E. chilcnsis would thus appear to be a 

 crossvein, presumably r; R2+3 short, about as long as r-tn ; 

 R4+5 parallel with R3 basally but soon diverging, ending immedi- 

 ately behind the wing-apex which is very obtuse ; r-r,i opposite the fork 

 of M ; no decided curvature on Ml to indicate the position occupied by 

 the atrophied M2. 



Abdomen dark brown, the pleural membrane more grayish. 



Habitat. Argentina. Holotype, $ , Rio Diamante, south- 

 ern Mendoza, January, 1921 (Dr. Carette). Allotopotype, $. 



Edwardsina argcntincnsis differs from the genotype, E. 

 chilcnsis, in its larger size, dark coloration of the body, the 

 slightly different wing-venation and the more conspicuous anal 

 angle of the wing. 



University of Michigan- Williamson Expedition to Brazil 



A zoological expedition to the interior of Brazil has been organized 

 at the Museum of Zoology, University of Michigan, through the inter- 

 est and support of Mr. E. B. Williamson, Honorary Curator of Odo- 

 nata. It is to be known as the University of Michigan-Will amson 

 Expedition. The members of the expedition are Mr. Jesse H. William- 

 son and Capt. John Strohm, U. S. A. Both men have had .wide experi- 

 ence in the tropics, and are outfitted in a most excellent manner for the 

 prosecution of their work. They will leave New York on December 

 15, 1921, and will be in the field for about eight months according to 

 their present plans. If particularly favorable conditions are encoun- 

 tered, a longer time may be spent in their explorations. 



The region to be investigated is that of the Sierra de Parecis and the 

 country westward toward the Bolivian frontier. The party will pro- 

 ceed directly to Manaos and then to Pt. Velho, which town will prob- 

 ably be their general headquarters for their explorations to the south 

 and west. 



The Odonata will receive the most detailed study, other groups to lie 

 collected are the Formicidae, Orthoptcra, I.epidoptera, Diptera and 

 Arachnida, and in addition to the Arthropoda mentioned much atten- 

 tion will be given to the reptiles, amphibians and shells. FREDERICK 

 M. GAIGE, Ann Arbor, Michigan. 



