THE HOP-VINE LEAF-HOPPEB. 49 



be done without much trouble, and that this would prove the besl pos- 

 sible remedy to prevent the spread of or damage by the aphids. 



Another enemy is the larva of a Syrphus fly, which I find in small 

 numbers on the vines. This larva is of a uniform yellowish- white color, 

 about one-fourth of an inch in length, with a stout body tapering to the 

 head. It is a slimy insect, with no perceptible legs or head, but a mere 

 rounded opening for a mouth. It glues itself fast in a position where 

 lice are abundant, and, stretching its head in every direction, seizes ail 

 lice within its reach, and when it has cleared all within its reach moves 

 on to a new center of operations. 



The lice are also attacked by a disease, apparently of a fungoid na- 

 ture. I noticed several instances where all the lice on a leaf appeared 

 unnaturally large or swollen, and of a brownish-yellow color. On being 

 handled they crumbled into a very light brownish, granular dust. The 

 disease does not appear to be widespread, and I cannot give any nearer 

 details as to its nature or origin. 



THE HOP-VIXE LEAF-HOPPER.* 



{Typhlocyba sp.) 



An insect known as the " green fly" is pretty generally found in hop 

 yards all through the summer, and sometimes very numerous. This 

 insect has been said to "stiug the heads" and to cause " slide down" or 

 "foolish hills," while others claim it does no damage whatever. The 

 insect is of a greenish to yellowish color, with a short, broad head, long, 

 narrow body, and two pairs of wings, the first narrow, long, and yellow- 

 ish-green, with a dark dot on each, the hind wing broad and transparent. 

 The legs are yellow, the posterior pair very long and stout, the shanks 

 set with spines, and as a whole fitted for leaping. The young or im ma- 

 ture forms resemble the full-grown insects in all points, except that they 

 want wings. They are very active, leaping off at the least disturbance. 

 and when full-grown using their wings as well as their legs to good ad- 

 vantage. The adults hibernate in crevices, in barns, or wherever they 

 cau find shelter, and appear in spring as soon as vegetation appears. 

 They mate and breed all through the season, and become very numerous 

 occasionally. They seem to be somewhat local, as in some yards I could 

 not find them at all, while in others close by they were abundant. As 

 a rule, yards badly infested with aphids had none of these hoppers, 

 while Mr. Risley's yard, which was b\ all odds most free from aphids, 

 had these hoppers more numerous than they were elsewhere. 



These insects do not damage the hops; they are found most usually 

 on the lower leaves (*. c, not more than 5 «>r n' feet up the pole), and feed 

 by puncturing one of the ribs and sucking tiie sap. The injury done 

 by them consists in so weakening the veins that they are unable to 



*This insect i* an iindocribed Bpeoiesof Typhlocyba, but the material received and submitted to Mr 

 P. R. Uhler is considered by liim in too poor condition to permit «( proper characterisation. — (\ V. K. 



81)93— Bul. 4 4 



