ar 
THE GRAIN BUG. Dil 
imposed on a cylindrical cluster of eggs of the New Mexico range 
caterpillar (/Zemileuca oliviae Cll.) that had been deposited around 
a sunflower stem. 
NUMBER OF EGGS IN EACH CLUSTER AND THEIR DISPOSITION. 
Counts were made of 185 typical egg clusters collected in the field 
during 1915 and 1916. The number of eggs in individual clusters 
varied from 138 to 48, the average being about 26. The smallest ege 
cluster consisted of 9 eggs and the largest, apparently deposited by a 
single female, consisted of 75 eggs. No uniformity was apparent in 
the number of eggs composing each cluster. This is a deviation from 
the published records, which indicate that in closely allied species 
there exists a uniformity in the number of eggs in each cluster. 
The eggs are deposited with considerable regularity in two or four 
parallel rows, each egg being placed in the alternate space between 
the eggs of the adjoining row (see fig. 3), and each row consisting of 
from 7 to 20 eggs. This tendency is particularly marked when plant 
stems or the awns of grain heads are selected for egg deposition. 
Frequently when eggs are deposited on the broad surface of an ob- 
ject the formation of the cluster is very irregular. 
NUMBER OF EGGS DEPOSITED BY EACH FEMALE. 
The females normally do not deposit their full complement of 
eggs at one time or in a single cluster. Twenty-one newly matured 
females collected in the field early in the season and placed in con- 
finement deposited a maximum of 107 and a minimum of 9 eggs, the 
average being 54 eggs from each female. These eggs were deposited 
in from 1 to 10 clusters over periods extending from 1 to 16 days. 
(See Table VI.) 
TABLE VI.—Oviposition habits of confined. females of Chlorochroa sayi. 
Average Days 
Number 
Total : number | between 
Houle mae of SED Mupaper Ol eee: in each of eggs Art nl 
‘ of eggs. clusters : in each last ovi- 
: cluster. | position. 
1 91 5 58-3~-7-14-14 oe eee 18.1 16 
2 56 DES ae WY oS NIG yea See a Ns Na SOte tien Bua omens 
3 32 ALi ger | Rayos Pa ae A na ee ee A od PS VAG IOV Rua eal 
5 60 6 3-4-6-44-1-2. 22 eee 10 5 
9 62 3 aL ers aye AR bic aR ae ty Uy a 20. 2 1 
10 43 2 ae Niet el gl Ae aN oN 21.5 1 
12 107 5 56-30-11-4-6...222222.....2.- 21. 2 10 
16 11 2 er TAGs GUE Iced uN Leahy 5.5 2 
17 16 1 LG Me pai NRE es yeaa eat cl aes SOP pantera ees ates 
18 58 5 ca 7k las ay coma et i AS 6 
19 55 3 Boe OE Ae age ee IMR gue 18 3 
20 56 2 Pah SALA US AN UNE AL aS 28 11 
21 53 2 AOS TSS A RG AO) NL NRE g, 26. 5 3 
22 9 3 SHO eOM aie Au Rey NEL TSAR RNS 3 4 
23 67 2 Oa Se are a 33. 5 2 
24 97 4 AGT SDE OG ie envy! 24. 2 13 
25 43 3 De D6 Oe yaar cs A ees UN 14.3 3 
26 61 6 16-9-33-1-1-1...-..22.2...... 10.1 11 
27 43 ADR SAG kaa ea ey MeL eC AB ii tay Nel NMEki a as: 
28 71 2 GOSS rea teen kG, OB a Se RIT 35. 5 i) 
30 43 10 31-2-1-1-1-1-1-1-2-2......... 4.3 2 
