46 DIPTERA. 



the wings reaches a little beyond the proximal half of the first basal cell, and fills out 

 the proximal third of the second basal cell ; the apical spot encroaches upon the 

 anterior portion of the second submarginal cell, and is separated from the black cross- 

 band by a hyaline triangle with an oblique prolongation at the apex which does not 

 quite reach the costa ; the distal margin of the cross-band is framed in by a whitish 

 border ; the cross-band is not interrupted by any hyaline spots, it fills out the proximal 

 end of the first posterior cell (within a short distance from the inner end of the second 

 submarginal cell), the proximal third of the second, the proximal half of the third, and 

 the whole fourth and fifth posterior cells, and becomes paler near the posterior margin, 

 which it follows as far as the anal angle. 



Male. Altogether black, shining ; antennae like those of the female ; face covered 

 with yellowish-grey pollen ; callosities large, black, shining ; thorax clothed with black 

 hair ; legs black ; halteres black (knob yellowish-brown in one of the specimens only) ; 

 a minute tuft of whitish hair at the tip of the abdomen ; wings black, greyish towards 

 the anal angle ; a hyaline triangle, the apex of which does not quite reach the costa, 

 separates the apical spot from the black region ; the shape of the apical spot, as well as of 

 the distal margin of the remainder of the black region, is exactly the same as in the female. 



Six males and as many females. 



N.B. — This species has an altogether northern physiognomy ; nevertheless I have not 

 been able to identify it either among the North- American or among the South- 

 American species. It will be easily distinguished by its black antennae with an incrassate 

 first joint. 



2. Chrysops costatus. 



Chrysops costatus (Fabr.), Wiedem. Aussereur. zweifl. Ins. i. p. 198 &c. 



(?) Tabanus variegatus, Degeer, vi. t. 30. f. 7. 



Chrysops vulneratus, Rondanij Esame &c. p. 44 l [O. S.]. 



Hob. Guatemala, Teleman (Champion) ; Nicaragua, Chontales (Janson). — West 

 Indies (common) ; Brazil 1 . 



3. Chrysops latifasciatus. 



Chrysops latefasciatus, Bellardi, Saggio &c. i. p. 71, t. 2. f. 15 1 . 



Hab. Mexico 1 (Salle 1 ); Guatemala, La Tinta (Champion); Costa Eica, Cache 

 (Rogers). 



4. Chrysops tanycerus, sp. n., $ . 



First two joints of the antennae unusually long, brownish-yellow, the third joint black and shorter than the 

 second; thorax brown, with two distinct, rather distant, whitish lines; wings irregularly clouded with 

 brown, especially along the cross- veins. 



Length about 9 millim. 



Hah. Costa Rica, Cache (Rogers). 



