8 
Psyche 
[February 
of living flies, without undue handling, and this led to a study 
of the external anatomy of the species, the primary aim being the 
• discovery of secondary sexual characters that might be readily 
recognized. 
The scope of this investigation has gradually increased, 
and in this paper takes the form of an exposition of the external 
morphological characters of the species. These characters are 
here designated according to the most widely accepted view of 
leading workers in insect morphology, and thereby do violence 
to the terminology in common use among taxonomic workers. 
This is perhaps unfortunate, but it is unavoidable, if morpho- 
logical accuracy is to be maintained. 
SYNONYMY. 
The species was first described by Fabricius (1794)^ as 
Musca pennipes. from material secured from the ‘‘Carolinas.’’ 
His subsequently described Thereva hirtipes (1805, p. 219.9), 
Thereva pennipes (1805, p. 219.8), and Ocypiera ciliata 
(1805, p. 315.9) have proved to be synonyms. His Dictya 
pennipes (1805, p. 327.5) is a change of genus from Musca. 
Other synonyms are Phasia jugatoria Say (1829), and Trichopoda 
flavicornis and T. haitensis of Robineau-Desvoidy (1830). The 
genus Trichopoda was erected by Latreille (1829), and both 
Wiedemann (1830) and Robineau-Desvoidy (1830) soon placed 
the Musca pe^inipes of Fabricius in this genus. The T. pyrr- 
hogaster and T. ciliata of Wiedemann (1830) have since fallen as 
synonyms, Brauer and Bergenstamm (1891) showing that these 
were but females of the species. The complete synonymy, so 
far as can be determined by the writer, is included in the biblio- 
graphy at the end of this paper. 
GEOGRAPHICAL DISTRIBUTION 
The genus Trichopoda belongs to the New World fauna. 
T. pennipes has a wide distribution in both North and South 
America and among the adjacent islands, according to Townsend 
^Dates in parenthesis refer to the bibliography. 
