THE CANADIAN ENTOMOLOGIST. 177 



it cjftcn occurs in great abundance. On young nursery stock, 

 however, I have seen it net only stunt the growth to a very great 

 extent, but to actually kill the tender tips of the shoots. In America 

 Miss Patch says that it. is by far the mcst troublesome of the 

 leaf aphides of the apple in Maine; contrary to what w^e notice in 

 Britain. It can easily be dealt with by spraying, unlike our most 

 troublesom.e Apple Aphis — Aphis kochii. 



The hind tibiae cf the oviparous female are not swollen, as is 

 usual, and bear but very few sensoria; in fact, in m.any I have 

 been unable to find any pores at all. 



(to be continued). 



SOME 1915 NOTES ON A FEW COMMON JASSOIDEA IN 

 THE CENTRAL MISSISSIPPI VALLEY STATES.^ 



BY EDMUND H. GIBSON, U. S. BUREAU OF ENTOMOLOGY, 

 WASHINGTON, D. C. 



The past year has been especially favoura,ble for jassid col- 

 lecting in the Central Mississippi Valley, principally because of 

 frequent rains favouring rank growth of native grasses and weeds, 

 and an ever abundant supply of tender plant growth and foliage. 

 The following notes are from observations made in w^estern Illinois, 

 Kentucky, Tennessee, eastern Missouri and Arkansas. 



DrcECidacephala moUipes Say was everywhere abundant frOfm 

 early spring until late fall. During the early summer it wa.s very 

 numierous in northern Arkansas, where it caused considerable 

 injury to young corn. Great quantities were observed around 

 electric lights in the heart of the city of St. Louis early in September. 

 There is no doubt but that D. moUipes has a characteristic habit 

 of long flights at night. This is one, if not the mcst general feeder 

 of all the Jassoidea. However, oviposition seems to be confined 

 principally to grains, grasses, and grass-like plants. This sharp- 

 headed grain leafhopper was seldom, taken in sweepings from the 

 foliage of trees. 



Diedrocephala versnta Say became abundant during the late 

 summer. It was found to be of economic importance to cow-peas 

 in Missouri, where occasional injury was noted to the tender growth 

 of the vines. Alfalfa is the only other field crop upon which they 

 were found abundant. Adults were collected from many ornam.ental 



Mav. 1916 



