32 PARASITES OF THE COTTON BOLL WEEVIL. 
Taste XIX.—The seasonal distribution of the parasites—Continued. 
| Bracoueel(Gatolacens Eurytoma | Ceramby- 
Total) mellitor. | incertus. |*Y!oderma-| cobius cy- 
num- tis. aniceps. 
Locality. Date. [srr ———— = = 
para- Per- Per- | Per- Per- 
sites Ao cent- eats cent- eal cent- Nu cent- 
line age age. | ~~ * | age "| age 
| 
1906. | | 
WiACtOnia Bexar ess ase e Afibbarsy Wy es eo aooane Ne Eee (teresa [ae tera Is eee ecto ce later Be cee ena ae 
One eere eciee cee see JUNE Zoe see eee 9 | 5 | 55.5 DAN a? 7A ete aol We A eee So 
DO ees sock esses JUNG 20 eee sci s itil 2 | 18.0 CR (ea Faye lene | [as aad ee le ea 
Dion Beta teeta cee UME 268 See eee 20 10 | 38.4 WN 2639) Wize epee es eel sree coe | eee 
1D XC Rea sas Se UME: 2S yn eee Si) |) aly |) 22! 8 | 24.2 1 B30) hese eee ae 
DOx Az 4a. sSactecereee JUNCWS ee eee ee DAN eS Soe cael te SN Sa Le De | 
DOM ee pee ee liven Pete eee PN este ea| posal be ay st tek Coma fons al Se ee IR a 
DOR eee ae tees ully/5 22a peste OE TN Fe ares] Peres [ese ariel eneteeees (esters es |S Ses ee 
DOS e ees cee cee tly sO tes eee ee re 13 | Sezai |e 2 ele EM eee ee ees eee 
DOueesn Soe sere ces July 852) 222235 32 | 18 |} 56.2 2) 6.2 dW eho Oe ete leet ns 
ID NOYE ot As ae en euaianae at Jnalye22n. eee se ee 5 34 OOO | ayer | rape | rctvcees)| eee | eee ne | a 
DOS ee ete ce NEE September 1...-... 75 45 | 60.0 3 | 4.0 3} 4.0 a fs ale 3) 
WISCOM Meme) fad = ohne Julbyg 20s eects ne | 78] 25 | 32.0 6726 Si isis} 4 5.1 
1 Da} ees wee ee INpesuSHE 7/2 = 5 5 ee ee ates} 1 | 20.0 1 | 20.0 ||: 20501)) 5 sees |e eee 
Oars ee etn ee eee August 28........- 83 Aa D4. 2 lore cess aco. | S824 25 | 29.8 
DO eee se eres Musust2 oe ee | 114] 64] 56.1 11} 9.6 3] 226 12) 10:5 
IL) OS er crsiae eee ae September 19...... 36 19 | 52.7 Z|) eD20 8 | 22.2 20} 55.5 
DOS Sas sera cakee October l2easesee=- irae) oe (ees oer bee esr ems tee (Mea ft gop el | oe 
These figures show very plainly the range of each species and 
have therefore been used to form a map of the two predominant 
species throughout the State. The centers of the areas predominated 
by Catolaccus are Brownsville, Tex., and Orange, La. The influence 
of Bracon radiates from Goliad and Corsicana, Tex. The center of 
predominance for Cerambycobius is Marshall, Tex. Eurytoma 
becomes an active agency at Dallas and Overton, Tex. 
BIOLOGICAL NOTES ON THE PARASITES. 
1. Microdontomerus anthonomi Cwfd. The Torymide have always 
been considered by Dr. William H. Ashmead as parasitic on Diptera. 
In addition to the records of parasitism upon the boll weevil, which are 
given on a preceding page, one other specimen was bred September 
13, 1905, at Mexia, Tex., by F. C. Pratt from Brachytarsus alternatus 
Say, breeding in the stems of Sideranthus rubiginosus. The species 
is not at all abundant, and has only been collected in cotton forms 
between August 28 and September 3. It is perhaps a one-genera- 
tion species, although it may have some other and still unknown 
host. There is but one individual to each host, and the host may 
be in the larval or pupal state when attacked. The sexes occurred 
in the proportion of 2 males and 11 females. 
In order to ascertain the length of the developmental periods, the 
following scheme had to be used: The maximum period from col- 
lection to maturity is the nearest approach possible to the total 
developmental period, and next to this is the total period in a Bracon 
cocoon in case of hyperparasitism. The maximum period from the 
observation of the larva to maturity is the nearest approach possible 
