iO 



MrS(;ELLANE()US COTTON INSECTS. 



May 13, when a single pair was ob.served. On May 20 several pairs 

 were observed en cojmla and other females were found to be full of 

 mature eggs. At this time they had left the elms and some had migrated 

 to sorghum, cotton, corn, and sunflowers, but they were still common on 

 hackberry. On June 10 the adults were numerous on sunflower and 

 pigweed; and nymphs, undoubtedly of this species, were found on 

 hackberry. On the 17th as many as fifty to the stalk were observed 

 on sunflowers; but although common on weeds at the edges of the 

 fields, none were found on cotton. During the weeks previous to 

 this date none were seen on elm or hackberry, ])ut the}' were quite com- 

 mon on Cottonwood. During June and July numerous unsuccessful 

 attempts were mad(^ to secure eggs from adults in confinement. Until 



about July 20 the adults were 

 common upon sunflower and 

 Cottonwood, but at about that 

 date they became more scarce, 

 and were found only on 3"oung 

 bush(\s. During the early 

 siunmer a few nymphs in vari- 

 ous stages of development 

 were usually found with the 

 adults. 



At Terrell several adults 

 were confined on cotton June 

 17. The next day one lot of 

 ten eggs was laid in a row 

 just under the epidermis. 

 ^ nn JT , 1- . ■ . 1 1. . 1 ,-. 1 . t These hatched June 24, and 



Fig. ZO.—JIumalo(hsca tnqucirn: adult at lelt, last stage ' 



of nymph at right, young nymph bilow— all enlarged the Uymphs moltcd OU July 

 fanthnr-s illustration). ^ ^ .^^^^| ^g ,^^^^ AugUSt 15. All 



died on August 26. After the third molt the wing pads were just 

 appearing. Judging from this fact and comparing further observa- 

 tions on nymphs tak(>n in the field August 8, which molted once 

 before becoming adult, it seems probable that had these nymphs 

 lived they would have molted twice more and become full grown 

 early in September. During the latter half of July the adults were 

 decidedly less abundant near College Station. A])Out the 1st of 

 August the cowpea was found to be a favorite plant for food and 

 for oviposition. Young were ol)served hatching on August 3 and 

 5, and at about the same time nymphs were observed to make the last 

 molt and become adult. During the first two weeks of August numer- 

 ous agg masses were laid in cowpea leaves in field cages at the college, 

 often two or three masses in a leaf. The eggs are usually laid in rows 

 on the ventral side of the leaf, averaging about twenty in a Yo^\. The 

 surface of the leaf above the eggs is covered with a whitish powder 



