282 Mr, C. H. T. Townsend on Diptera 



I suspect that T. umbra^ Walker, from Venezuela (List, 

 p. 698), is another variety of histrio. It seems very pro- 

 bable from the description of the brown bloom on abdometi, 

 becoming tawny on last segment, with a median vitta 

 separating it. The specimen described was a female. 



Pennapoda, subgen. n. 



Differs from normal forms of Tricliopoda in the abdomen 

 being nearly the same shape in both sexes, subcylindrical, 

 rounded at tip, narrowed a little at base, not flattened-sub- 

 quadrate in male. Hind tibia? much less strongly ciliate, 

 with weak cilia on apical half; claws of female very short, 

 those of male elongate but black. Wings hyaline on more 

 than inner half. Apical cell closed in margin. Characters 

 of the vibrissa? and frontal bristles same as in Trichopoda^ 

 but the bristles somewhat stouter. It has a distinct facies. 



Type T . jyhasiana , sp. n. 



The forms of Trich. histrio connect this subgenus with 

 Trichopoda proper. They are intermediate between the two, 

 very much approaching Pennapoda in certain characters, but 

 yet more nearly related to Trichopoda in general facies. 



42. Trichopoda phasiana^ sp. n.' 



Ten males and six females. San Rafael, both sexes taken 

 from June 30 to July 13. All on flowers of the Cordia sp. 



Length of male 7 to 8 millim., of female 6 to 7 millim. 



Male. — Face silvery, with a golden shade ; orbits narrow, 

 distinctly golden, extending nearly to vertex. Rest of front 

 taken up with the very wide soft black frontal vitta. An- 

 tenna? blackish or brown, second joint below and base of third 

 more or less yellowish, third joint not twice as long as 

 second. Palpi yellowish. Mesonotum golden-pollinose, with 

 three wide black vittae, interrupted at suture, and more or less 

 joined behind suture, sometimes in one transverse piece of 

 black irregularly and widely bordered behind by golden. 

 Sometimes the middle black vitta in front of suture is split 

 from behind by a line of golden. Scutellum black, silvery 

 pollinose except at base. Pleurse silvery pollinose. Abdo- 

 men black, with a large oval pale yellow spot on second and 

 third segments on each side, extending from near anterior 

 margin of second to within about same distance (one fourth 

 to one sixth length of segment) from posterior margin of 

 third, notched on inner side, more or less obliquely extended 

 posteriorly, the median black between the two spots being 

 much wider on third segment than on second. Fourth and 



