14 



abdominal segment. The extreme tip is armed on each side with a 

 minute spine, directed laterally and ventrally. Between these spines 

 are four short, moderately coarse bristles. Length of specimen used 

 in description, evidently male. 11 mm; width, 3.5 mm. 



The cocoon. — Transformations take place in elliptical oval cocoons 

 constructed of particles of earth or sand, joined rather firmly together 

 by means of silk spun by the larva. One of these cocoons is shown at </, 

 fig. 1. The average measurement is about 16 mm. long, and the diameter 

 is about half that. These cocoons are usually formed in the immediate 

 neighborhood of the infested plants, and such as have been observed 

 were constructed close to the surface of the ground an inch or less 

 below it. 



The galls. — The galls at the time that the larva has reached full devel- 

 opment measure about an inch to an inch and a quarter in length, 

 that being the average length of the burrow of the larva within. In 

 diameter they measure at this time about half an inch, but some have 

 been seen later in the season that measured three-fourths of an inch. 



The opening to a gall is usually made at one end, but occasionally near 

 the middle, and of those seen a majority were placed at the lower end. 



A gall with mass of exuding excrement is shown in figure 1 at c. 



OCCURRENCE IN 1899. 



Infestation was not noticed until July 8, but undoubtedly began 

 earlier, when several vines were observed to be dying from within one 

 to two feet of their tips, the leaves drooping over and slowly withering. 

 Three or four holes were noticed on each of these vines, evidence that 

 the parent insect had deposited three or four eggs upon each at rather 

 regular intervals, and from these holes issued a small quantity of 

 yellowish-white f rass. The vines were in each case somewhat bent at 

 the point of attack and some had already begun to assume gall-like 

 proportions. Some of the vines were cut at this point and larvae were 

 found from a little less than a quarter to about half an inch in length. 

 The largest burrows were at this time a little more than three-fourths 

 of an inch long, one-eighth of an inch at the opening, and only about 

 one-sixteenth in width, or just large enough for the easy passage of the 

 larva up and down the vine. 



The infested portions of vines collected July 8 were placed in a 

 rearing jar and kept moist to prevent their drying. When examined 

 July IT, one larva, about half grown, was noticed crawling about the 

 jar. It was removed and placed in another jar with a fresh vine, and 

 was found to have bored into this the following day. It is obvious, 

 therefore, that the larva? are capable of leaving an infested stem for 

 another one as they crawl well and secrete a strong silk thread which 

 readily supports the body, and thus they are able to" let themselves 



