278 



THE MONTHLY BULLETIN. 



rather, there are three, but of the third there is only one specimen and 

 in consequence I did not feel justified in describing it. 



I am calling the commoner of the two species Pipunculus iiidustrius, 

 the rarer one — of which there are three females ancl one nuile — P. raga- 

 bundus. The paper is in the hands of the Biological Society of Wash- 

 ington and I am promised that it will be out by the tirst of April." 



Prof. H. Osborn, of the Ohio State University, examined the leaf- 

 hoppers from which the different .species of Pipioiculus were bred and 

 he determined them as the sugar beet leafhoppers {Eutettix tenella 

 Baker). Dr. E. D. Ball (1, pp. 49-52) has taken several other species 

 of Eutettix, Agallia and Empoasca on sugar beets, and in all probability 

 some of our h()])pcrs cai)tur('d at raiulom by sweeping beet leaves with 

 an insect net were not EutcUix iciulla. 



"Mr. S. A. Rohwer determines the two i)arasites bred from the sugar 

 beet leafhopi)er as Gonaiopus coniorfidns Patton 9 , find Laheo 

 sp. n. ^ . He says that this male is no doubt that of the above female. 

 There is much confusion about the males of Labeo, of whicli no female 

 is known. Some male Labeo are males of females described in Gona- 

 topus and Dryinus. " 



Prof. H. Osborn also determined the leafhopper as Eutettix tenella 

 from which Gonaiopus contortulus was reared. 



On January 11, 1914, 46 leafhoppers. which were inactive on account 

 of the low temperature, were taken in viaLs from sugar beet seedlings 

 and adjacent vegetation at King City. These beet seedlings had 

 sprouted from seeds of not regular j^lantings, after the first rains in 

 November, 1913. Two Pipunculus puparia ancl four Gonatopus cocoons 

 were found later in the breeding jars. In this case 13 per cent of the 

 pests were parasitized by these natural enemies. 



On January 21, 1914, the same beet field was visited and 30 leaf- 

 hoppers were collected in vials from the sugar beet seedlings. No para- 

 sitic larva? issued from these leafhoppers. 



On June 30, 1914, 15 leafhopper nymphs were taken in a beet 

 field at Pleasanton, California. About 75 per cent of the beet seedlings 

 showed a serious condition of "curly -top." Three days after confine- 

 ment some of the nymphs passed through the la.st ecdysis. Five leaf- 

 ho])pers were parasitized by Pipunculus, four larva^' ifisuing from the 

 host on July 20, and one on July 25. 



To avoid further details the data on parasitism during the season of 

 1914 have been condensed in the following table, which shows the 

 number of leafhoppers collected, the dates and localities in California 

 where the specimens were captured, and the number and percentage of 

 parasitized hoppers : 



TABLE I. 



