from the Rio Xaut/uj State of Vera Cruz. 281 



black, \Viiitj;;s pronouiicecUy black, except narrow limpid 

 liitul margin. Tlic abdomen is frenerally, especially in the 

 feniaK', more distinctly orange-coloured. 



Tills somewhat arbitrary separation of these two forms 

 must be borne with till actual licld observations prove their 

 true relationships. 



Both pennipes and pilipes were described by Fabrlcius and 

 Wiedemann from the male, and the descriptions both apply 

 well in regard to the postsutural golden markings of meso- 

 notuni. As before stated, these markings are quite con- 

 stantly characteristic of the male in both varieties. Phasia 

 jugatoria. Say, Oci//>tera ciliata, Fabr., T.pi/rrhogaster^Wied.j 

 and T. haitensisj Desv,, therefore all become synonyms of 

 T. pib'pesy Fabr., since all are dark-winged forms. Although 

 Wiedemann designated the female in his description of 

 T. pilipes, it is quite certain, from his diagnosis, that he was 

 describing the male. The others seem all to have been 

 described from the female (not inchid'm^ pennipes). 



T. Jlavicornis, Desv., is another variety of ^9e^^/^^/?es, chiefly 

 distinguished by its yellowish anteunai. 



41. Trichopoda histrio, var. indivisa, var. n. 



One male. San Rafael, June 30. On flowers of the 

 Cordia sp. 



Length 9 millim. 



Fifth and sixth segments of abdomen thickly and densely 

 deep golden-yellow poUinose. Fourth segment thinly so, 

 showing a continuous golden surface only when viewed from 

 in front parallel with the plane of the tergum. Second and 

 third segnient3 showing some silvery pollen wlien viewed in 

 same way. No fascise, therefore, are shown on the abdomen, 

 but a continuous pollinose surface, without interruption to the 

 pollen on the median line. The fuscous of costal half of 

 wing is very largely yellow, except at its base, tip, and on 

 its posterior border, where it is more deeply smoky. Other- 

 wise agrees well with Loew's description of trifasciata. It 

 is thus seen that this form varies widely from the typical 

 histrio in the pollen of abdomen, doubtless representing a 

 Mexican or neotropical variety. 



T. trifasciata, Loew, may be continued as a variety of 

 histrio. Walker's specimen, which must be taken as typical, 

 possessed only two abdominal fasciaj. It will be well to 

 designate the form with three and four fasciae by Loew's 

 name. 



The forms of histrio are entirely destitute of cilia on the 

 hind femora. 



Ann. c& Mag. N, Hist. Ser. 6. Vol. xx. 20 



