244 INDEX. 



37; position of egg of, on prey, 37; position of grasshopper in nest, 37; 

 condition of prey after being stung by, 38; length of time occupied in 

 making nest by, 39. 



Stigmus AMERiCANUs, uests in stumps, di; collects aphides, 44: collecting 

 journeys of, occupy three or four minutes, 44; several individuals of, 

 use the same gallery, 44; description of nest of, 44; position of egg of, 

 on aphis, 44; number and condition of aphides found in nests of, 44; 

 parasites of, 45. 



ARGENTiFRONS, provisions nest with aphides, 45. 



TROGLODYTES, ncsts in straws and preys upon larva of a Thrips, 45. 



Stinging habit in solitary wasps, variation of, in different species, 222; 

 species that use it to kill, 223; purpose of, 226, 227; origin of, 225. 



Stink-bug, refused by spider, 161. 



Tachytes sp?, date of appearance of, 167; remarkable method of progres- 

 sion when carrying prey, 167; prey of, 167; variation in number of 

 grasshoppers stored by, 168; position of egg of, on grasshopper, 168; 

 length of egg and larval stages in, 168; condition of grasshoppers stung 

 by, 168; perfection of method of paralyzing prey in, 168; has difficulty 

 in finding way back to nest after capturing grasshopper, 213. 



Trypoxylon, immense numbers of spiders destroyed by, 87. 



ALBOPiLOSUM, takes larger spiders than r^<6roc^■ncifM?«, 85; preparation 



of nest by, 85; condition of spiders in nest of, 85; "parasites of, 8C. 



BIDEXTATUM, habits of, 86; stinging habits of, 86; order in which per- 

 fect insects emerged from cocoons of, in one set of cells, 86; cocoon of, 

 differs from those of ruhrocinctum and albopilosum, 86. 



RUBROCINCTUM, usicg holcs already excavated, 77; preparation of nests 



of, 78; length of time occupied in storing nest by, 78; cooperation of 

 males and females of, 79; protection of nest by male of, 79; method of 

 taking in spider of, 80; male of, sometimes assists in storing nest, 80; 

 the packing in of the spider by, 80; number of spiders used by, de- 

 pendent upon their size, 80; accuracy shown by, in never selecting a 

 spider too large for calibre of straw, 81; refuses to sting in captivity, 

 81; position of egg of, on spider, 81; condition of spiders found in nests 

 of, 82; table showing length of life of spiders that have been stung by, 

 83; length of egg and larval stages in, 83; eating habits of larva 

 of, 84; locality sense of, 84; length of cocoon stage, 84; order in which 

 perfect insects emerged from cocoons of, in one set of cells, 86. 



Venom of wasps, experiments with Polistes fusoa on grasshopper, 33; ex- 

 periments on cray-Ssh, spiders and caterpillars with Pelopaeus ce- 

 mentarius, Polistes fusoa and Vespa macMlata, 193-195, 



Vespa maculata, experiment on venom of, with caterpillar, 195 



