197 



Drake (C. J.). Two New Tingids from the West Indies (Hem.-Heter). 

 — Ohio Jl. Sci., Columbus, xviii, no. 5, March 1918, pp. 174-176. 



The species described are Leptodictya bambusae, sp. n., taken on 

 the leaves of bamboo, Bambusa vulgaris, in Porto Rico and probably 

 closely allied to L. tabida, H.-S., the sugar-cane Tingid, and Leptostyla 

 macelfreshi, sp. n., from Haiti. 



Fenton (F. a.). The Parasites of Leaf-hoppers, With Special 

 Reference to the Biology of the Anteoninae. — Ohio Jl. Sci.f 

 Columbus, xviii, nos. 6, 7, 8, April. May, June 1918, pp. 177-212, 

 243-278, 285-296, 5 figs., 6 plates. 



Leaf- hoppers are subject to attacks in all stages by various parasites, 

 including Hymenoptera, Diptera and Strepsiptera in North America, 

 the Anteoninae being the most important Hymenopterous ones in 

 northern Ohio. These Dryinids are found in all parts of the world 

 and, so far as is known at present, confine their attacks to the Fulgorids, 

 Cicadellids and Membracids. They are themselves parasitised by 

 Encyrtids and Eulophids. 



The oviposition period begins soon after emergence and lasts probably 

 a month in nature, the largest number of eggp obtained in captivity 

 being 13. The egg is very minute and often thrust deeply into the 

 body of the host. It is probably true that the great majority of 

 Dryinids hibernate as larvae within the cocoon, there being apparently 

 no difference in the structure of the winter and summer cocoons. 

 The number of generations a year depends upon the species of host 

 attacked and upon the climate. 



The larva of Aphelopus introduces some toxic substance into the 

 tissues of the host or otherwise stimulates the abnormal development 

 of the hypodermal tissues into a hypertrophied cell mass, at the 

 expense of the gonads, which fail to develop. Species of Gonatopus, 

 Hoplogonatopus and Chelogynus parasitising the nymphs prevent 

 further development of the host. Adults that become parasitised by 

 membefs of these genera, may still reproduce at first, but reproduction 

 is rapidly impaired or entirely stopped. 



The classification of this subfamily is dealt with, keys to the genera 

 and species being given. 



Davidson (W. M.). U.S. Bur. Entom. The Convergent Ladybird 

 Beetle {Hlppodamia convergens, Gu6rin) and the Barley-corn 

 Aphis {Aphis m/xidis. Pitch). — Mihly. Bull. Cal. State Commiss. 

 Hortic, Sacramento, viii, no. 1, January 1919, pp. 23-26, 2 figs. 



A brief record is given of experimental work undertaken in the 

 Imperial Valley of California in 1918, to determine the value and 

 practicability of the natural control of Aphis maidis by Hippodamia 

 convergens. Early barley appears above the ground in this locality 

 before Christmas and continues to grow until June. In 1918, every 

 field examined was infested with Aphids, the attack beginning when 

 the barley was four or five inches high, and reaching its maximum 

 intensity between mid-February and mid-April. From 70 to 95 per 

 cent, of the heads became infested, but as the time for heading out 

 approached, the Aphids became much more scarce, developing wings 

 and forsaking the host, and grain well headed was generally free from 



