TABANIDA OF OHIO. 15 
NATURAL ENEMIES. 
Some years ago Hart reared a hymenopterous parasite, Pan- 
urus tabanivorus, from the eggs of T. atratus. This appears to 
be a common parasite, and | have reared more than a hundred 
specimens from a single cluster of eggs. 
It is very common to find clusters of eggs of both Tabanus 
and Chrysops more or less injured by being eaten into and some 
of the eggs destroyed. Various predaceous insects have been 
observed to be responsible for this condition of things. 
Around ponds where Tabanids are issuing many specimens 
fall a prey to predaceous insects of different orders. Tabanids 
fresh from the pupa case are not active and require time for their 
wings to harden before they fly readily. I have observed two 
species of Hemiptera, Limnobates marginatus and Phytocoris 
nubilis, preying upon teneral adults of “‘Chrysops callidus; and 
E. B. Williamson has sent in teneral specimens of Chrysops vit- 
tatus taken from Mesothemis simplicicollis, one of our com- 
monest dragonflies. Robber flies of the family Asilida, which 
appear to have no choice of species when capturing their prey, 
have occasionally been captured with specimens of Tabanus in 
their possession. 
A PARTIAL BIBLIOGRAPHY OF LITERATURE ON NORTH AMERICAN 
TABANIDZ PUBLISHED PREVIOUS TO OSTEN SACKEN’S PRO- 
DROME OF A MONOGRAPH OF THE TABANID® OF THE UNITED 
STATES. 
Bellardi, Luigi. 
1. Saggio di ditterologia messicana. Two parts and Supplement; five 
plates. 1859-1862. 
Degeer, Baron Charles. 
2. Mémoires pour servir 4 l’Histoire des insectes. 7 volumes. 1752-858. 
Only the 6th volume contains descriptions of Tabanidae. 
Drury, Drew. 
3. Illustrations of Natural History. London, 1770-82. Three volumes. 
(A new edition of this work was published in 1837, by Westwood, 
under the title of Illustrations of Foreign Entomology.) 
lelzlaveieneis, Iq (C 
Systema Entomologiae. Flensburgi, 1775. 
Entomologia Systematica. 4 volumes. WHafniae, 1 
ment 1798. 
Systema Antliatorum. Brusvigae, 1805. 
Forster, J. R. 
Novae Species Insectorum. Centuria I. London, 1771. 
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