VOL. 54, NO. 1, JANUARY 1978 
13 
Stenotabanus .” Their attempts, however, to check this by genitalic 
dissections in each sex eventuated unsuccessfully, possibly be¬ 
cause the specimens were somewhat teneral. This surmise regarding 
primitive diachlorine relationships was confirmed in a delicate, 
genitalic preparation from the allotype male during a recent visit of 
Dr. Sixto Coscaron, La Plata University, Argentina, to the California 
Academy of Sciences. The allotype and genitalic mount have been 
returned to Canadian National Collection, Ottawa. 
In addition to the postulated autogenous development, because of 
discovery of eggs in the sectioned abdomen of the apparently 
somewhate teneral holotype female, other unusual features are the 
biannulate antennal styles in both sexes and the female frons with a 
deep notch at vertex but no calli below, as figured by the describers. 
The collector did not recall the circumstances of the original 
capture, but it must have been near some breeding site where botn 
sexes were present, at just over 2100 meters altitude, in Chiapas near 
San Cristobal. It is disappointing that no additional, fully mature 
specimens have turned up in subsequent collections by several 
collectors of Tabanidae in the general area. 
I am indebted to Dr. Coscaron for the genitalic studies and con¬ 
firmatory opinion regarding diachlorine relationships. 
Literature Cited 
Philip, C.B. 1976. New North American Tabanidae (Diptera). XXII. New species in the Tribe 
Diachiorini in Mexico. Wasmann J. Biol. 34:43-51. 
Philip, C.B. and G.B. Fairchild. 1974. A peculiar new genus of Diachiorini (Diptera: 
Tabanidae) from Mexico. Canad. Entomol. 106:985-986. 
Philip, C.B. and L. Floyd. 1974. New North American Tabanidae. XXI. Another new Bol- 
bodimyia from Mexico. Pan-Pacific Entomol. 50:145-147. 
Stone, A. 1954. The genus Bolbodimyia Bigot (Tabanidae, Diptera). Ann. Entomol. Soc. 
Amer. 47:248-254. 
Tidwell, M.A. and C.B. Philip. 1977. A new Bolbodimyia from Mexico’s central plateau 
(Diptera: Tabanidae). Pan-Pacific Entomol. 53:97-100. 
