96 PROCEEDIXGS OF THE NATIONAL MUSEUM. tol. 51. 



Discal cell on first basal 656 



Discal cell on second basal 50 



Oblique apical side of anal 240 



Miocene shales of Florissant (Geo. W. Wilson). 

 Holotype.— Cat No. 61992, U.S.N.M. 



TABANUS MERYCHIPPI, new species (Tabanidae). 



Length 13 nim., abdomen 5.5 mm. broad: anterior wing 10 mm. 

 long. Size and appearance of T. lasiophfhalmus Macquart. (from 

 Garrison, New York), but eyes not hairy; apical (small-jointed) 

 portion of antennae more conical, broadened basally instead of cylin- 

 drical; distance between eyes a little less (about 0.8 mm. instead of 

 1 mm.). Spots on wings placed exactly as in lasiophthalmus (with 

 the addition of slight dusky suffusion at ends of second and upper 

 branch of third veins), and the abdomen also has a rather obscure 

 dark median band. Comparing the venation with that of lasiofh- 

 thdlmMs., the discal cell is narrower basally, the fourth posterior cell 

 is contracted apically (its width at margin of wing 384 microns, but 

 at lower apical corner of discal cell 640), and first posterior cell is 

 narrower (its width near apex 480 microns). Miocene shales of 

 Florissant; (Geo. W. Wilson). 



Eolotype.— Cat. No. 61993, U.S.N.M. Easily known from the pre- 

 viously described species of Tabarms from Florissant by the smaller 

 size and spotted wings. 



CHILOSIA SEPULTULA, new species (Syrphidae). 



Length about 8.5 mm., width of thorax about 3.5 mm. ; wings 8 mm. 

 long. Head and thorax dark ; abdomen pale, thinly hairy, with black 

 or very dark narrow sutural bands; no longitudinal band. Costa 

 thick, with two rows of minute bristles, as in C. miocenica. Apical 

 angle of first posterior cell more acute than in C. mioeenica. 



The following measurements are in microns; the corresponding 

 measurements of C. miocenica are given within parentheses: 



Width (depth) of marginal cell 800 from end 352 (272) 



Length of first posterior cell from lower basal corner to upper 



apical corner 4,000 (4,080) 



Submarginal cell on first basal (not allowing for curve) 1, 200 (1, 280) 



First basal on second posterior : 830 (1, 090) 



Second basal on second posterior 270 (320) 



Second basal on third posterior 304 (256) 



Holotype.— Cat No. 61994, U.S.N.M. 



The type is from the Miocene shales of Florissant (Geo. W.Wilson). 



The smaller specimen, assigned to C. miocenica'^ and collected by 

 Mr. Rohwer, belongs to this species. 



»Bull. Amer. Mus. Nat. Hist., vol. 26, 1909, p. 72. 



