December, '10] PIERCE: WEEVIL PARASITISM 455 



The following examples in w^hich all died show how much duplica- 

 tion of energy there frequently is : 



2 Catolaccus hunteri Crawford — 7 examples. 



3 Catolaccus hunteri Cravvford — 2 examples. 



4 Catolaccus hunteri Crawford — 1 example. 



5 Catolaccus hunteri Crawford — 1 example. 



2 Catolaccus incertus Ashmead — 3 examples. 



3 Catolaccus incerlus Ashmead — 1 example. 



4 Catolaccus incertus Ashmead — 2 examples. 

 -5 Catolaccus incertus Ashmead — 1 example. 



6 Catolaccus incertus Ashmead — 1 example. 



2 Eurytoma tylodermatis Ashmead — 7 examples. 



3 Eurytoma tylodermatis Ashmead — 2 examples. 



5 Eurytoma tylodernmtis Ashmead — 1 example. 



2 Microdontomerus anthononii Crawford — 1 example. 



3 Microdontomerus anthononii Crawford — 1 example. 



4 Microdontomerus anthononii Crawford — 2 examples. 

 8 Microdontomerus anthonomi Crawford — 1 example. 



Mixed superparasitism is that phase in which two or more species 

 are brought together upon the same host. The following records will 

 show how common it is among parasites of the boll weevil. 



We have many cases with only two parasites involved in which one 

 individual survived. The sex of the survivors and the number of 

 examples are given at the end of each line: 



Unknown super. Catolaccus hunteri — 1 example. 

 Bracon mellitor super, unknown —19. 

 Catolaccus sp. super. Bracon mellitor — 19. 

 Catolaccus hunteri super, unknown — 19. 

 Catolaccus hunteri super. Bracon mellitor — -19. 

 Catolaccus incertus super. Bracon mellitor — 2 9. 

 Cerambycobius cushmani super. Bracon mellitor — 8 cf (7), 9 9 . 

 Cerambycobius cyaniceps super, unknown — 1 cf • 

 Cerambycobius cyaniceps super. Bracon mellitor — 23 cf (6), 28 9 . 

 Cerambycobius cyaniceps super. Catolaccus hunteri — 2 cT , 2 9 . 

 Cerambycobius cyaniceps super. Catolaccus incertus — 1 cf , 3 9 . 

 Eurytoma tylodermatis super, unknown — 1 c? (3), 2 9 . 

 Eurytoma tylodermatis super. Bracon mellitor — 8 & (2), 2 9 . 

 Eurytoma sp. super. Bracon mellitor — 1 cf. 

 Microdontomerus anthonomi super, unknown — 1 cf , 1 9 . 

 Microdontomerus anthonomi super. Bracon mellitor 4 cf (3), 14 9 . 

 Microdontomerus anthonomi super. Catolaccus hunteri — 19. 

 Microdontomerus anthonomi super. Eurytoma tylodermatis — 1 cf , 1 9 . 



The number of examples is much smaller where more than tw^o 

 individuals are concerned and one survives. 



2 xmknown, 1 dipteron (survivor) — 1 example. 



2 unknown, 1 9 E^irytoma tylodermatis (sur\dvor) — 1 example. 



3 Eurytoma tylodermatis, 1 9 Microdontomerus anthonomi (sur\avor) — 1 example. 

 3 Eurytoma tylodermatis (1 9sur\'ives), 2 Catolaccus hunteri — 1 example. 



6 unknown, 1 9 Catolaccus hunteri (sur\'ivor) — 1 example. 



7 Catolaccus hunteri, 1 Microdontomerus anthonomi (survivor) — 1 example. 

 16 unknown, 1 Microdontomerus anthonomi (survivor) — 1 example. 



In the majority of cases studied all superparasites died. These 

 records are here grouped according to the number of individuals con- 

 cerned. 



