K. T. CRKSSOX, JR. 9 



that there is only one frontal bristle, and the yellow clasps of the 

 male genitalia are simple and similar to antetmwpes Say. 

 One pair. Mexico. 



C'alobata diver!<»a Schiner, Xovnia Eeise, 250, 1868. 



This species is readily distinguished by its blackish wings and the 

 short second section of the costa. 



Two females. Mexico. 



Calobata angnlata Loew, Ceutur., vii, 87, ISfiO. (IM. II, figs. 12, 13, 14.) 



Bluish-black to browuish. Front, vertex and occipu*- not differentiated by 

 ridges. Front brownish, sometimes with bluish-black reflections, suhshining, 

 thinly whitish pollinose; a round velvety-black spot in the middle just before 

 the black ocellar tubercle; this tubercle is situated about midway between the 

 post-verticals and the antennae; three frontal bristles. Vertex with bluish-black 

 subshining lateral angles. Occiput bluish-black, white pollinose above ; brown 

 and silvery below. Face shorter than wide, thinly white pollino.se, brown at 

 sides, yellow in the middle, with a narrow black transverse line between the 

 foveae; clypeus brown, shining, with white bloom ; cheeks brown, very narrow. 

 Anteuuie brown or rufous, as long as the face; third joint three to four times as 

 long as the second, infuscate at base; arista blackish-brown, bare. Proboscis and 

 palpi brown. Thorax bluish, subopacjue, caused by the whitish granular coating, 

 posterior margin and pleurae more shining; below the fore coxa- yellow. Meta- 

 notum whitish pollinose. Scutellum somewhat more shining than the thorax. 

 Halteres blackish, pedicles yellow. Abdomen brownish; *irst segment with a 

 broad pollinose posterior marginal band ;' posterior margins of second, to some- 

 times the fourth segments, white. Genitalia of both sexes similar to antennxpes 

 Say, but the clasps of male are again forked posteriorly (see fig. 12). Ovipositor 

 of female shorter in comparison and apex more attenuated, black, apical third 

 shining. Fore coxx and femora brown ; tibiae black ; tarsi white, the basal joints 

 somewhat brownish beneath. Middle femora black, apex and extreme base 

 rufous, with a distinctly oblique preapical whitish band (fig. 14) ; tibia; and tarsi 

 blackish. Hind femora similai', but l)ase broadly yellowish ; metatarsi lighter. 

 Wings brownish, with the base and two cross-bands, and more or less of the hind 

 margin hyaline; first band slightly oblique, over the small cross-vein ; the second 

 somewhat lunate, beyond the posterior cross-vein, touching the costa just beyond 

 the end of the second vein (fig. 13j ; ajjical cell open ; anal cell very long, attenu- 

 ated, ending about the length of the small cross-vein before the margin of wing. 

 Length 8-10 mm. 



Both sexes. Paramaribo, Dutch (iuiaiia (Mayo). 



C'alobata aiinulata Fab. fPl. II, figs. 15, 16 and 17.) 



Masca Fabricius, Ent. Syst., iv, ."538, 1794. 



Calobata Wiedmann, Aus. Zw., ii. .534, 1830. 

 %. — Similar to angnlnta Lw. Tlie black median frontal spot less defined in 

 outline; no frontal bristles; vertex more or less difttrenliated from the occiput 

 by a ridge, not rounded. Face without a well-defined transverse strijte at the 



TKANS. AM. KNT. SOC. XXXIV. (2) JANUARY, 1908. 



