THE GRAIN BUG. 25 
TABLE VIII.—Daily activity and feeding habits of adults of Chlorochroa say, 
July 15, 1916—Continued. 
Wire cage 3 by 3 by 3 feet over wheat plot—2 male and 4 female adults. 
Hour. | Temperature. 
Weather conditions. Observation on activity. 
Shade.} Sun 
A. M., 2h. OR 
8 (el eee oe 2 feeding. 
8. 30 TASB NS 3 feeding. 
9 78 106 Clear... .-.----- 2-20-22 222 02 eee rere tee ee eho e eee eee 2 feeding. 
9. 30 80 114 Dorr 
10 82 Sele Clearenwindirisin esas wee wae eee Me Ae ea None feeding. 
10. 30 83 116 2 feeding. 
1 86 | 104 \Clear iia gaan te daa Ua RRM Os aa 3 feeding 
11.30 87 114 Do. 
Wleamsslie ln Giweltr dsr nese Lys lena Uae ee ecole 4 i 
12 88 feeding. 
Pa: 
12. 30 91 ad Parthycloudyashghtswind /2h222 205. 9) oe ie ae 
90 114 A * 0. 
1. 30 93 107 \Partly cloudy; no wind CRSP RSID ST Oi CET CAO O CR Oto r 5 feedin NV 
2 ‘ 94 104 Be 
23 97 102 0. 
3 90 (yp CRESS cele i HE INGE ee ep ae ue ue io Do. 
3. 30 88 90 3 feeding 
4 88 88 d Do. 
4.30 83 Saal Cloudy tSlisi bewar Ges Asien aia ee La Ae eee 4 feeding. 
5 82 82 5 feeding 
5380! >/ > 80 SimleClearingewless winds Wir wee Te ee ai ee 4 feeding. 
6 80 80 f Do. 
6. 30 SU) | Saas Clearing; Nomwind 5) 2--CE I. 2: ea oe me Lee Pal 5 feeding. 
7 (Qa betemeae 5 feeding and resting. 
7.30 GUA beatae Do. 
8 TAD | Bea see CLS AT: ATM OVA TA as Seesrere eee apd Ape NOTE es GU tae Do 
9 (es esannane Do 
Observations made at various times during the night indicate that 
the adults continue feeding after the daylight hours, providing that 
the temperature remains high enough for them to continue their 
activities, 
PREDACIOUS AND CANNIBALISTIC HABITS. 
In life-history cages the grain-bug adults frequently fed upon the 
contents of their own eggs. Under these same conditions the adults 
also fed upon the dead bodies of their companions and upon the 
issuing dipterous parasite larve. Apparently these predacious and 
cannibalistic habits are abnormal, as no observations of a similar 
character were made in the field, where on all occasions the nymphs 
and adults were observed to feed exclusively upon plants. 
GREGARIOUSNESS. 
The grain bug exhibits a marked degree of gregariousness in hiber- 
nation and to a more limited extent during its period of activity in 
the field. In May, 1916, a total of 30 hibernating adults were found 
under one “ cow chip ” about 6 inches square, and in the same vicinity 
175 adults were collected from underneath the rubbish along a 20-foot 
space in an irrigation ditch. When feeding in the field they appear 
to prefer certain food plants to the exclusion of others of the same 
kind and in the same stage of development. This characteristic fre- 
