10 AMERICAN l:)IPTERA. 



oral rnaij;in ; lieavily silvered in certain aspects; fovese dark brown to black; 

 clypeus dark brown, polisbed and pollinose. Palpi distinctly marfjinated ante- 

 riorly with white. Antennae brown; base of third joint reddish, as is also the 

 base of the arista. Thorax bluish, more or less shining:, pollinose posteriorly, not 

 opaque; pleurae more shining and silvery; njetanotum black, silvery below. 

 Scutellum brownish, shining, but brownish pollinose in certain aspects. Knob 

 of halteres black. Abdomen shining, brownish; base of first segment broadly 

 whitish pollinose; hind margins of second and following segments more or less 

 narrowly yellowish. Genitalia not prominent, similar to antennxpes Say in that 

 the clasps are simple (fig. 17). AJl femora are black or brown ; the basal third 

 and a preapical ring of hind and middle femora, not oblique (fig. 15), translucent 

 whitish-yellow; the fore femora with an indistinct reddish ring just beyond the 

 middle; all tibire blackish; anterior tarsi snow white. Wings hyaline, with a 

 blackish cross-band between tlie anterior and including the posterior cross-veins ; 

 sometimes a trace of another band before the anterior cross-vein ; a blackish 

 apical spot, darker on the basal margin, and more or less hyaline towards the 

 apex, separated from the preceding band by about the width of the band (fig. 

 16) ; apical cell open ; anal cell long, attenuate, reaching to within one-half the 

 length of the posterior cross-vein from the margin. Length 9-10 mm. 



Several males. Paramaribo, Dutch Guiana (Mayo). 

 This species can be readily separated from angulata Lw. by the 

 characters given in the table, and by the above description. 



Calobata lai^civa Fab. (PI. II, fig. 18). 



Musca Fabricius, Ent. Syst. Suppl., 574, 1798. 



Calobata, Wiedmann, Aus. Zw., ii, 535, 1830. 

 Similar to angulata Lw. Front flattened above; the black velvety median 

 spot, especially of the 9 is more pointed and nearly reaching the antenna?; ver- 

 tex and occiput separated by a distinct ridge. A black velvety spot between the 

 antenna; and the eyes, touching the latter. Third joint of antennae yellowish- 

 red at the base, on the inside. Genitalia similar to antemisepes Say, but the 

 clasps of male are stouter and wider apart on a broad base. The preapical rings 

 on the middle and hind femora are very narrow, and not at all, or only slightly, 

 oblique; fore metatarsi black. Wings similar, but the apical, lunate, hyaline 

 hand is nearer the apex; the apical cell closed; anal cell not as long. Length 

 7.5-8 mm. 



Both sexes. Jamaica (Johnson and Fox), Lower California. 



Mr. Johnson records his capture and gives synonyms in hi.< 

 list of the "Diptera of Jamaica," Proc. Acad. Nat. Sci. Pliila., 

 271), l.Si)4. 



Cardisicepliala loiiKipcs Fab. 



Mi(nc.a Fal)iicius, Ent. Syst., iv, 338, 1794. 



Cardiacrphala Macquart, Dipt. Exot., ii, 3, 243, 1843. 

 <renerally brownish. Front shining, dark brown, with an opaque, brown, me- 

 dian vitta, in which are situated the ocelli about midway between the post-ver- 

 ticals and the antennie; sides of front, especially the lower portion, wrinkled, 

 with three frontal bristles; vertex polished, very much produced posteriorly 



