1929 ] 
Stylopized V espidse 
249 
STYLOPIZED VESPID ^ 1 
By George Salt 2 and Joseph Bequaert 3 
It is becoming increasingly difficult to prepare a complete 
account of the various insects infested with Strepsiptera. 
Many of the early writers on these parasites gave lists of 
hosts without stating definitely whether they had them- 
selves seen stylopized specimens or whether their records 
were copied from earlier workers. Taxonomists have 
mentioned infested specimens in monographs of various host 
groups, so that many records have become scattered in 
articles not at all concerned with the parasites, where they 
are likely to be found only by a student of the hosts. Mis- 
takes in the identification of host species have caused much 
confusion ; and the change of names, which seems inevitable 
in taxonomic revision, has greatly complicated the existing 
lists. 
As one of us (J.B.) has been for a number of years 
interested in the Vespidse, while the other (G.S.), in the 
course of studies on stylopization, has found it necessary to 
keep lists of stylopized wasps, we have thought that it would 
be useful to publish jointly an annotated list of the Vespidse 
known to be infested with Strepsiptera. From the data 
contained in our list we have been able to draw several con- 
clusions which are of some interest and importance to the 
general subject of the inter-relation of parasite and host. 
We have examined stylopized material mainly from the 
Academy of Natural Sciences of Philadelphia, the American 
Museum of Natural History, the Boston Society of Natural 
1 Contributions from the Entomological Laboratory of the Bussey 
Institution, Harvard University, No. 305. 
2 Department of Tropical Medicine, Harvard University Medical 
School. 
3 National Research Fellow in Zoology, 1927-1928. 
