CHRYSANTHEMUM MIDGE. 13 
TaBLE [V.—Length of complete life cycle. 
Length 
Cage. Eggs deposited. Adult emerged.! of life 
cycle. 
1917. Days. 
TEEN Oy eee] ete Mle oe ao Yet aia es Gee ae aa IE DANG) ey 248) HOY AY ISIN RA Se gia es Dea: RIL ee aly 27-30 
Dal ete ClO a ade Sache aanee HNee Seen JNFOORLUR ROI eNOS Rim ces ie nea Ai gl a ea a ier 28-30 
Sse GO Be Reh en Rae py Eph es PA Mays libosMiaya2 = Sipe = ares rae os Serer 29-30 
1918 
Al ll TNGOY Ths SSeS Neaeletactns Ste ests sin sealers eH ss AR a MS pry ee oe eee es een 31 
OM ECD eee ek aa ee an as lees Be Sep hen Maras CosMiar iis seta sepeae anne sa soe eee 30-33 
Gr iMiaraile ste ste meer ce ie a Oe gt ee INDE JOIN D 22 canis 8b Gun bdinasea aan dase 38-52 
7 | ACh IB GIES eee sea ie eas Reso es oo teas seta JN OPS a ee SAe Oe atieie Sor Smee soeiae aes ete 32 
See MaraG-Oheirtoce ile Feat Bek Paes Apr. 22 te Apr. 27 Been, Sercres e  e eee Ayan te 47-49 
ENTUIRS Sis, RINT Nata rte a aree Rida nice Fe cams Oe SKE OURO O NSIC) O} Fey COs a See ae ce ek te eae i 32-34 
1On eee CORE ered: ers Seta ah SSOP epee Sept. i TOSE DUE Sera ee ee Se ee 39-46 
Vibe) | ANS Oh ae So eee Se eee oan ae ore artes SLT D1 Fey OSS Ge anes As teas alae te apes come ey lees eae ls 30 
DPA BD le eran seine ete ee EE ee es a he SOD U2 oHOy O16 bd ee a ge eee ees =a a 29-38 
ASAT CMR OO eemence ycerya see ae itn ape Ste feral Sept. 26 to Oct Bohs tdi de seg alg ae lett ici! 28-35 
Ae eee ORO s a ged Se eee ete ere SKE 1b 27) TRO ONC AS ee era Ge ee eee 29-34 
US sasse GOs SOs SN Sick ae ea, Gomera (SEBS ica a a es an at SN ee 34 
IGA eee CLO Be see) on eget ney Me A er A ake OV CERES eared ec Se SoS |. see Baye SP 36 
BU fta BESSY 0) os AI BE a a A Ore OCD N LOVNO Wome te eames ee Mee 33-42 
1 Data given in Table I show that mated females deposit eggs on date of emergence. 
In the spring of 1917, 1918, and 1919, three distinct generations 
were observed. ‘The first generation started about the middle of 
February and the last adults of this generation emerged during the 
last few days of April. The second generation started about the 
middle of March and the last adults issued around April 30. The 
third generation started the latter part of April and emerged during 
the early part of June. In the fall of 1918 when the occurrence 
increased again a similar grouping of generations was evident, the 
first beginning about the latter part of August, and the last adults 
emerging during the first days of October. A second generation 
started about the middle and latter part of September, maturing the 
first days of November. The third generation was observed beginning 
about the middle of October and the last adults emerged about 
November 25. 
NATURAL ENEMIES. 
Felt (20), in speaking of the natural enemies of the midge, states 
that— 
It was very likely brought to America without the normal quota of parasites and 
for a time at least it may prove to be a somewhat difficult insect to control, though it 
would seem as if the native parasites of our large and varied gall midge fauna might in 
time prey most successfully upon this midge. 
Essig (18) mentions: 
During the summer a large number of parasites were reared from infested plants and 
one species in particular did excellent work in the university greenhouse. The 
material was sent away for determination and a few observations made as follows: 
Amblymerus sp. This hymenopterous parasite has been described by Mr. A. A. 
Girault, through the kindness of Dr. L. O. Howard, and a description is to appear 
elsewhere. The adults are black with yellow markings on the legs. The females 
vary from 1 mm. to 1.2 mm. in length, and the males are somewhat smaller. The 
