217 



Subfamily PSYCHODIN^E. 



The chief distinctive features of this subfamily are (1) the 

 presence of a 7th longitudinal vein of considerable length, ahvays 

 as conspicuous as the 6th, and (2) the forking of the 2nd longi- 

 tudinal vein quite near the base of the wing instead of at or 

 beyond the middle, as in the PHLEBOTOMISE. The upper branch 

 of the 2nd longitudinal vein forks again as usual in this family, 

 but this second forking always occurs before the middle of the 

 wing. 



The secondary characters are the structure of the male genital 

 organs, consisting of two (Psychoda and Pericoma) or three 

 (Brunettia and Parabrunettia) pairs of appendages. The ovi- 

 positor of the female consists of a conspicuous horny scimitar- 

 shaped projecting appendage, forming a pair of valves. 



Table of Genera. 



1. The 3rd longitudinal vein ending exactly 



at the wing-tip '2. 



The 3rd longitudinal vein ending just 

 below the wing-tip 3. 



2. Membrane of wing never considerably cov- 



ered with scales, these being confined to 

 those forming the small wing-spots. 

 Flagellar joints of antennae without con- 

 spicuous S-shaped chaetae. Male geni- 



talia with two pairs of appendages 



Membrane of wing with considerable areas 

 covered with scales. Flagellar joints of 

 antennae with distinct, fairly conspicuous 

 S-shaped chaetae.* Male genitalia with 

 three pairs of appendages 



3. Anterior basal angle of wing not abnor- 



mally extended ; auxiliary and 1st longi- 

 tudinal veins in their usual position. 

 Membrane of wing without scales. Fla- 

 gellar joints of antennae witli the S-shaped 

 chaetae inconspicuous or absent. Male 



genitalia with two pairs of appendages . PERICOMA, Walk., p. 234. 

 Anterior basal angle of wing very dis- 

 proportionately rounded and distended, 

 so that the auxiliary and 1st longitudinal 

 veins are very much removed from the cos- 

 tal margin. Membrane of wing closely 

 and wholly covered with overlapping 

 scales. Flagellar joint of antennae with 

 conspicuous S-shaped chaetae. Male 

 genitalia with three pairs of appendages. BRUNETTIA, Ann., p. 248. 



PSYCHODA, Latr., p. 218. 



PARABRUNETTIA, Brun., 

 [p. 251. 



* I do not know that these have been obseryed in every species, but it 

 seems probable that they are generally, if not always, present, as there appears 

 to be a correlation between these organs and the densely scaled wings. 



