from the Rio Nautla, State of Vera Cruz. 21 
Rhyphide. 
24, Olbiogaster tenratus, Bell. 
Rhyphus teniatus, Bellardi, Sagg. Ditt. Mess. Append. p. 5, pl. fig. 15. 
One male, San Rafael, June 26. In sweepings. 
Length about 74 millim., measuring the curve of the 
abdomen. 
Agrees perfectly with Bellardi’s description and figure, 
except that the middle femora are mostly yellowish. It also 
agrees perfectly with Osten Sacken’s description of the genus 
Olbiogaster, and bears out his remarks on the genus at the end 
of the description (see Biol. C.-A., Dipt. i. pp. 20-21). 
Osten Sacken has there pointed out that 2. tendatus, Bell., is 
an Olbiogaster. This is the first record of the finding of this 
species since Bellardi described it in 1862. 
This very curious dipteron exactly resembles at first sight 
some of the smaller Hymenoptera, the general form, aided by 
the markings of the abdomen and the long slender antenne, 
giving the appearance presented by some of the small 
Ichneumonide. 
Tabanide. 
25. Tabanus mexicanus, var. limonus, n. var. 
One male, on flowers of the Cordia sp., San Rafael, 
July 17. 
Length 114 millim., not including antenne ; wing 10 millim. 
Entirely of a tawny lemon-yellow colour, including the 
narrow costa of wings on basal two thirds. Eyes in life 
wholly pale yellowish olive, abruptly more glassy on lower 
one third; in the dried specimen rich brown. Antenna, 
palpi, and legs with a slightly deepened tawny tinge. Second 
antennal joint one half as long as first; first as long as its 
apical breadth ; second shorter than wide, with an anteriorly- 
directed apical spur on upper edge ; third joint about twice as 
long as first and second together, with a well-marked acute 
process on base above, the process ending in an acute angle 
but not produced ; this process makes the basal width of joint 
about one third greater than width of first and second joints, 
Annulate portion of third joint rather slender and pointed. 
Face, palpi, breast, thorax, trochanters, and abdomen rather 
thickly clothed with brassy-yellow hair, that on the thorax 
and breast being longest and that on abdomen the shortest, 
the hinder two thirds of abdomen being rather sparsely clothed 
above. ‘l’arsi and ends of tibie slightly tinged with brownish, 
most pronounced on tips of tarsi. Proboscis tinged with 
