CONTENTS 
ARTICLE I. THE ORCHARD BIRDS OF AN ILLINOIS SUMMER. BY 
STEPHEN A. FORBES AND ALFRED O. GROSS. (1 Map, 6. PAGE 
PE eASUH SS) yA MAIL PL Orlistat «er alste keto Naver ayaa hts, ava\e le aloyat ave Sa ata/nyeie, wiadSiwie dlalate 1-8 
In Southern Illinois: _ 
PIpMMUAACEVOLDITOS «10 SONETAL foie a,c oscars) ove wie) iv ard Sivee Wio.e oo. sles sieicre 
RH CEINONCTADUNGANT -SDCCIGS s-cre/eie a cia ere aiejeiafsia oie cle stole ole le» a.0%si0,4 alae ahs 
Farm and commercial orchards compared.............+c+eeeeeeeee 
Men anGe DINGS UT COLCELLEMCE vic. .\oisiaaisie ors. 4) 5/200 c s\eisicie'se aioe’ ote sie sean 
Matsa Cu CLALIOUA  Malacie's c/sfeisie cis ccs: sje.s aleiu lee 'vieiele bac, obese ew ciele.sre oe eve © 
arn onrow pw 
ARTICLE II. ON THE DISTRIBUTION OF THE FRESH-WATER 
SPONGES OF NORTH AMERICA. BY FRANK SMITH. June, 1921 9-22 
SULSADRIVGGTL “oh otis cas eins pain CINEREA CAR Ine et ie 9 
SP SELIGITG 6 Gch Sica oe OICae ScD SRA CIE BOR STC. SERIA igor Ge Pa a 10 
HEV EETN OS) STSCI) be Ot Gadi ripen ey cI RCaonE SC POINT AIR acne 12 
PMI IOALNOLEH AMMGTICAN: TECOLGS®. 221. \-\olc)s icles o's oeceies.e's'ee 0 Sees seis ee 14 
Tabular presentation of distribution data.............cceceeceeeeeeee 16 
Literature dealing with fresh-water sponges of North America........ 18 
ARTICLE II]. A STUDY OF THE MALARIAL MOSQUITOES OF 
SOUTHERN ILLINOIS. II. OPERATIONS OF 1920. BY STEW- 
ART C. CHANDLER. (1 Map, 2 Trext-ricures, 2 Grapus) NoveMBER, 
BLED ea Me crest Meet ot ai fu gsieiscts wo latest aiaust oda s-te tats ol Ve: ctiaysiselaliavetele:\eis opeta, # aie ke nip .'erahalet whe, 23-32 
MOSCONE CHE OLIN cea tals o's cha lelaveres oiste o sicicvole else tec wisps b\eie'e We slele we sys e eeges wiacls 23 
Description of the breeding places at Herrin..................-..0005 23 
PM CMULOUICTION «Oly INOSOUITORS aisle sire cvelacns i -alsicils iwi slo G siars ie lous w/sia\e lave, oreyatevess 26 
MaMNALrInOTOl MECEGINE | PIACES 45 os con icpisynolnve. 0.0 eier'e -e.'0ls,e/s aie oie es st oais 27 
PERMA eID ELOR LNT sera icia tm cine s epeleisre «| elu tayhlo elie svefelere-s byalele ethia'els oe elalee le dais 29 
Relation between malaria and the malarial mosquitoes............... 29 
MUECIES OL GHOSGUALORS: ab ELerrin, LOZOQ WIS. cis cee cleanest vases sce 30 
BRESILCTNES LODE OTA ois oft e eYeIeclie clare >: Clvve weave lalsee Snveiers Bi oeatac Nard evalatanatstatetavecls 32 
ARTICLE IV. CHANGES IN THE BOTTOM AND SHORE FAUNA OF 
THE MIDDLE ILLINOIS RIVER AND ITS CONNECTING LAKES 
SINCE 1913-1915 AS A RESULT OF THE INCREASE, SOUTH- 
WARD, OF POLLUTION. BY ROBERT E. RICHARDSON. Dercem- 
Pea eres LD Uae toll eleetstciiny lala, ole aie <iinfalh. «fai apcvarsAiors) a+, Sys, a} sieydinic] oyslel's,0\=\0)\e cals. wie, aie levee 33-75 
The Illinois River and Peoria Lake, Chillicothe to Wesley............ 35 
The tuinois River, Liverpool to: Havana... 0 ice ccc ces eer ccceeseccns 48 
