284 



same that the spider later covers with a thick layer of sand. 

 Dr. Kr. gives three ways to come to a satisfactory result 

 with the question. I have tried all three and have come 

 to the same results as Br. and K. 



Pezomachus Gr. -|- Heiniteles Gr. No attempt has 

 been made as yet to determine the greater part of the 

 species of these genera, and I am of the opinion that at 

 present it is quite hopeless. From the results I have 

 obtained by breeding I again confirm that Gravenhorst's 

 arrangement of these species in two genera cannot hold 

 good. As will be seen from my list of parasites, I have 

 been able to show in about 25 — 30 cases that a Pezomachus 

 and a Hemiteles belon« to the same species. The are bred 

 from the same nest, several instances males and females 

 together, most commonly singly, although always breeding 

 from the same kind of nest a Pezomnvhus ^ or a Hemiteles 

 (^. In order to further prove that they were really males 

 and females of the same species I have tried to get a 

 Hem it. $ and a Pez. ^ to pair when I was of the opinion 

 that they were the same species. In this 1 have been suc- 

 cesfuU, and I have in my collection a specimen of Pez. zon. 

 that has paired with a species of Hem. art. bred from the 

 same kind of spider's nest as Pez. zon. 1 have further Pez, 

 and Hemit from the eggs of Lycosa and Pez. and Hemit. 

 from the eggs of Eryatis beniyna, that have paired under 

 my own observation. It may be remarked here, that it was 

 quite useless to put individuals together from the same 

 generation as brothers and sisters do not pair with each 

 other. It will also be noticed from my list that the 

 females are apterous (Pezom.j and the males winged ( Hemit. i 

 although both sexes can have wings or both apterous. The 

 most usual case is to find a winged example occur amongst 

 the apterous Pezomachus or that a single Hemiteles occurs 

 without wings. Single instances have occured where a species 

 of Hemiteles with both sexes winged had individuals of 

 both sexes also apterous (Nr. 59) and again single 

 instances where all the specimens that were bred of one 



