Sept., 191 1.] Matausch : Effects of Parasitic Castration. 195 



did not succeed in rearing any of the parasites. The larvae, how- 

 ever, escaped from one of the onh^ three infested specimens of the 

 small species of Tclamona taken during the summer of 1910. 



July I, 1910, I found, in the locality in which I collected during 

 1909, the first of these sexual anomalies, but this belonged to the 

 large Tclamona species (near heliria). It was feeding on Liquidam- 

 bar. July 2, on the same food-plant and in the same place, I took 

 two more of the anomalies and three normal females of the small 

 Telamona, which had been much more abundant during the pre- 

 ceding year. July 5 I captured one anomalous specimen and a normal 

 male. Acting on the advice of Dr. Petrunkevitch I kept the anomalies 

 alive on their food-plant in order to give the parasites an opportunity 

 to pupate, but the Membracids all died before the parasitic larvae could \ 



effect their escape from them. 



The Tclamona taken July 5 was kept in a glass by itself, but 

 on the fourth day, when I was about to give it fresh food, I found 

 it dead. In the glass were five pale green larvae which moved about 

 like Dipterous maggots. These had made their escape through the 

 ventral integument of the ]\Iembracid. Two of them, which seemed 

 to be vigorous enough to live, I placed on some earth and preserved 

 the three others in alcohol. Fig. 3 represents one of the latter. I 

 was hindered at this time from continuing my observations. Three 

 weeks later when I looked for the larvae left on the earth, I found 

 that they had disappeared and all the earth was covered with mould. 



I have also found Carynota nicra infested with parasitic larvje 

 very similar to those of Tclamona. One specimen of the former 

 IMembracid was taken in the beginning of July, the other on the 

 twenty-eighth of the same month. The abdomen of the latter speci- 

 men was abnormally distended with the parasites. In neither case did 

 I succeed in rearing these to maturity. The same was true of 

 Thclia bimaculata which I found in considerable numbers during 1909 

 near Newark, X. J. Among these were ten individuals with abnormal 

 genitalia of the type described in my former paper and all contained 

 parasitic larvae. 



This association of parasites with a malformation or inhibition 

 of the development of the external genitalia occurs, however, not 

 only in Tclamona, Carynota and Thclia but also in Glossonoins, for 

 I have found three parasitized specimens belonging to this genus 



