1953] 
Fairchild — Mexican Tabanidae 
43 
an abandoned lumber camp about 10 km. from the sawmill 
and said to be at the same elevation, though probably some- 
what higher. Here the forest, although considerably cut- 
over, consisted of very large trees with many palms. It 
was distinctly dryer than Palenque, though some rain fell 
during our stay. We were at this camp from April 10 to 
13. Collecting at both the camp and the sawmill was 
excellent. 
Much of the collecting was done with the aid of a modi- 
fied Shannon trap, although the use of a horse as described 
by Shannon (1939, Amer. J. Trop. Med. 19 (2) : 132-133) 
was dispensed with. During the day large numbers of 
Tabanidae and some mosquitoes entered the trap, while 
at night a gasoline lantern placed in the center compart- 
ment attracted nocturnal mosquitoes and some Phleboto- 
mus. In the following list those species believed to be 
hitherto unrecorded for Mexico are starred. 
*Assipala melanoptera (Hine). 19 $ Sta. Maria, taken 
attempting to bite the collector at La Puerta camp. 
None were taken in the Shannon trap. Previously 
known only from Guatemala. 
Chrysops latifasciata Bell. 3 $ Palenque, taken attempting 
to bite in the forest around the ruins. 3 $ Sta. Maria, 
attempting to bite around La Puerta camp. 
Chrysops pachycnemia Hine. 1 $ Sta. Maria, in forest near 
sawmill. 
Chrysops scalarata Bell. 1 9 Palenque, in swampy forest 
near village. 
Chrysops variegata de Geer. 9 $ Palenque, in swampy 
forest near village and wet forest below ruins. 
'^Chrysops willistoni Hine. 1 $ Palenque, in swampy forest 
near village. Previously known from Guatemala. 
Scione aurulans Wied. 25 $ Palenque, very abundant at 
the ruins, biting man avidly and taken in Shannon 
trap during the day. 9 $ Sta. Maria, abundant at La 
Puerta camp, but less annoying than at Palenque. 
More specimens could easily have been taken at both 
localities. 
