10 



DEPARTMENT BULLETIN 779. 



of head slightly reflesed or cariniform. First anteunal 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. BucculiB long 

 and prominent. Rostrum extending to hind coxa^. 



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 

 varies considerably. 



Color normally a decided 

 deep green, but varying from 

 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. 

 AntennjB blacli except for basal 

 segment and basal half of 

 second segment, which are 

 green. Pale yellowish green 

 beneath. Abdomen above black 

 except borders, which are yel- 

 FiG. 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 saij% 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 T days. 



