52 D1PTEKA. 



Halteres black. 



Front unusually broad, the frontal callosity transverse ; front tibiae 

 whitish at the base ; first posterior cell very strongly coarctate, 



often closed atratus, Fabr. 



Front not unusually broad, the frontal callosity not transverse ; front 

 tibiae altogether black; first posterior cell only moderately 

 coarctate. 



Narrow portion of the third antennal joint not remarkably 



elongate wiedemanni, O. S. 



Narrow portion of the third antennal joint unusually long lugubris, Macq. 



7. Tabanus bifenestratus, sp. n., $ . (Tab. I. fig. 9.) 



Black, abdomen red on the sides of the three first segments ; wings brown, the second basal, discal, and second 



submarginal cells subhyaline ; antennas and legs rufous. 

 Length 13-14 millim. 



Hab. Mexico, Ciudad in Durango 8100 feet (Forrer). 



Antenna? rufous, the scapus beset with black pile ; upper angle of the third joint well 

 marked, but blunt at the tip ; annulate portion rather stout, black, about half as long 

 as the basal. Face and palpi yellowish-red ; the latter rather narrow, with black pile ; 

 the cheeks with fulvous hairs ; front rather broad ; frontal callus reddish-brown, convex ; 

 subcallus rufous, denuded, shining. Eyes apparently glabrous. Thorax black with 

 yellow hairs, which are scarce on the back, but more dense and long on some parts of the 

 pleura?. Abdomen with the first three segments red, with black spots in the middle ; the 

 last four segments black, with narrow red borders. Coxae black ; legs rufous ; femora 

 beset with fulvous, the tibiae with black, hairs ; front tarsi brown, except at the base ; tips 

 of the other tarsi infuscated. Wings brown ; second submarginal, discal, second basal, 

 axillary, and spurious cells subhyaline ; first posterior cell broadly open ; no stump on 

 the fork of the third vein (but as the upper branch is somewhat angular at the base, it 

 is possible that a stump may occur in other specimens). A single female. 



N.B. — The specimen is somewhat injured by moisture on the head and the thorax ; 

 for this reason I have not been able to give a complete description of these parts ; the 

 very peculiar and easily recognizable colouring of the wings induced me nevertheless to 

 publish the species. 



The eyes (revived on wet sand) are green, with a single narrow purple stripe in the middle. 



8. Tabanus cribellum, sp. n., $ . (Tab. I. fig. 10.) 



Eyes glabrous, with three green cross-bands ; thorax greyish, with yellowish- white lines ; abdomen variegated 

 with brown ; wings hyaline, the first posterior cell broadly open ; antennae yellowish-red, the annulate 

 portion of the third joint rather stout. 



Length 9-10*5 millim. 



Hab. Mexico, Presidio {Forrer). 



