PSYCHE 
VOL. XLVIII JUNE- SEPTEMBER, 1941 Nos. 2-3 
THE HABITS OF THE EUCHARIDSE 
By C. P. Clausen 
Bureau of Entomology and Plant Quarantine, 
U. S. Department of Agriculture, Washington, D. C. 
From many points of view the Eucharidse are the most 
interesting of the families of Hymenoptera of parasitic 
habit. Though world-wide in distribution their habits and 
host relationships are little known. Studies thus far made 
have shown a parallelism in habit and development with the 
Perilampidae, though revealing an even higher degree of 
specialization and greater variations between species. 
Accounts are being presented elsewhere of the oviposition 
habits and on the morphology of the immature stages of 
the family, and the present article deals principally with 
the host preferences and the habits of the adults and larvae. 
Host Preferences 
All species of Eucharidse are, so far as known, parasitic 
upon the mature larvae or pupae of ants. The host prefer- 
ences of the species observed by the writer, so far as they 
were determined, are as follows : 
Species 
Chalcura deprivata (Walk.) 
Kapala terminalis Ashm. 
Kapala sp. 
Eucharis scutellaris Gahan 
Schizaspidia convergens 
(Walk.) 
Stilbula tenuicornis (Ashm.) 
Host* 
Odontomachus hsematodes L. 
Odontomachus hsematodes 
insularis pollens Wheeler 
do. 
Formica fusca fusca 
japonica Mots. 
Odontomachus hsematodes L . 
Camponotus herculeanus 
japonicus Mayr. 
Camponotus herculeanus 
ligniperdus obscuripes 
Mayr. 
^Determinations by W. M. Mann 
Country 
Ceylon 
Cuba 
Cuba 
Chosen 
Ceylon 
Japan 
Chosen 
