from the Rio yautia, Slate of Vera Cruz. 21 



Rhyphidae. 

 24. Olhiogaster taniatus, Bell. 

 lihyphus t(Pniaius, Bellardi, Sagg. Ditt. Mess. Append, p. o, pi. fig. \'>. 



Otie male, San Rafael, June 26. In sweeping.s. 



Length about 7^ millhn., measuring the curve of the 

 abdomen. 



Agrees perfectly ■with Bellardi's description and figure, 

 except that tlic middle femora are mostly yellowish. It also 

 agrees perfectly with Osten Sacken's description of tlie genus 

 Olhiogaster, and bears out his remarks on tiie genus at the end 

 of the descrij)tion (see Biol. C.-A., Dipt. i. pp. 20-21). 

 Osten Sacken has tiicre pointed out that A', tmniatus, 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 antennte, 

 giving the appearance presented by some of the small 

 Ichneumonida3. 



Tabanidae. 

 25. Tahanus mexicanus, var. limonus, n. var. 



One male, on flowers of the Cordia sp., San Rafael, 

 July 17. 



Length 11^ millim.,not including antennae; wing lOmillim. 



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 niakes 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. Tarsi and ends of tibiae slightly tinged with brownisli, 

 most pronounced on tips of tarsi. Proboscis tinged with 



