10 DEPARTMENT BULLETIN 1779. 
of head slightly reflexed or cariniform. First antennal segment less than one- 
half as long as second; second, third, fourth, and fifth segments of nearly the - 
same length, the second slightly the longest and most slender. Buccule long 
and prominent. Rostrum extending to hind coxe. 
Pronotum coarsely punctured and appearing somewhat rugose. Lateral mar- 
gins reflexed or cariniform. Callosities prominent. 
Scutellum coarsely punctured and appearing somewhat rugose, like the 
pronotum. ‘Three large prominent callosities on anterior border, one at each 
anterio-lateral angle, and one at the middle. Apex bluntly rounding. 
Elytra more finely punctured than scutellum with many small callous spots. 
Membrane clear. 
General form elongate. Average size of female 13.5 mm.; males somewhat 
smaller. The general _ size 
Se varies considerably. 
a ; Color normally a decided 
cc $f deep green, but varying from 
fad a pale yellowish green to red- 
dish brown. Numerous small 
white calloused spots on prono- 
tum, scutellum, and elytra. 
Lateral border of pronotum, 
basal portion of costal border 
of elytra, the three large cal- 
louses on anterior border of 
scutellum, and apex of scutel- 
lum yellow or red. As noted, 
the, color varies greatly but 
the numerous light colored 
callous spots are characteristic. 
Antenne black except for basal 
segment and basal half of 
second segment, which are 
green. Pale yellowish green 
cA Lie, beneath. Abdomen above black 
aE except borders, which are yel- 
Fic. 10.—The grain bug: Adult. Much enlarged. low and unmarked. 
LIFE HISTORY AND DEVELOPMENT. 
The observations on the life history and development of Chloro- 
chroa sayi, as detailed herein, were made at an altitude of about 
6,000 feet in northeastern New Mexico. These details probably 
would vary considerably under the different conditions of humidity, 
latitude, and altitude within the distribution of the insect. 
EGG. 
PERIOD OF INCUBATION. 
The period of incubation is from 4 to 13 days in length, depending 
upon weather influences, the average throughout the season being 
about 9 days. During the warm summer months the egg period occu- 
pies an average of from 5 to 7 days. 
i", 
