EE VISION OF STEEPSIPTERA PIERCE. 19 



2 female wasps with 2 female parasites= 2 parasites. 



7 female wasps with 5 male, 3 female parasites= 8 parasites. 



266 wasps with 306 male +164 female parasites =470 parasites. 



65.1 per cent of parasites are males. 

 34.9 per cent of parasites are females. 



Of the 164 female parasites only 71, or 42.6 per cent, occurred in 

 hosts containing no male parasites. Brues (1905) has pointed out 

 that hosts from which male parasites have emerged can not pass 

 through the winter. Furthermore, it seems that few male wasps 

 ever endure the winter season. This reduces the number of females, 

 then, which would have survived to reproduce their species, to 

 2, or .2 per cent, of the total number of females. 



These figures lack one powerful coefficient, however. It is not 

 known how man}' parasitized female wasps had left the nest at the 

 time it was taken. 



The location of the parasites may be summarized as follows: 



1 male protruding from the first segment, dorsal; total, 1. 

 21 males protruding from the second segment, dorsal L. ota i 9 p 



5 males protruding from the second segment, ventral/ 

 132 males protruding from the third segment, dorsal "1. , , , *„ 

 14 males protruding from the third segment, ventral / 

 85 males protruding from the fourth segment, dorsal \. , , -.*, 

 16 males protruding from the fourth segment, ventral/ 

 29 males protruding from the fifth segment, dorsal \. . , „q 



1 male protruding from the fifth segment, ventral / 



2 males protruding from the sixth segment, dorsal; total, 2. 



2 females protruding from the third segment, dorsal \. , , . 



2 females protruding from the third segment, ventral/ 



29 females protruding from the fourth segment, dorsal 1 , . , .,.-, 



3 females protruding from the fourth segment, ventral/ 



106 females protruding from the fifth segment, dorsal \ . . , -.,- 

 9 females protruding from the fifth segment, ventral/ 

 10 females protruding from the sixth segment, dorsal; total, 10. 



These figures show that the majority of the males protrude from 

 behind the third and fourth segments, while the females mainly find 

 exit behind the fifth segment. 



Brues (1905) at Paris, Texas, took in July 36 female wasps, from 

 which he secured 91 male parasites and 3 female parasites; 35 wasps 

 contained males, while 3 wasps contained females. Both sexes were 

 found in only one wasp. On October 3, from 36 female wasps he 

 took 81 male parasites and 44 female parasites; 25 wasps contained 

 males, 27 contained females, 3 contained larvae; 8 wasps contained 

 males only, 10 contained females only, 17 contained both sexes, and 

 1 contained a larva only. 



• At Orlando, Florida, Mr. W. A. Hooker found, on November 28, 

 1906, 1 dead male wasp which contained 3 male exuvia located in 



