FAMILY PSYCIIODID.E TPIE MOTH FLIES 



79 



occurs in South and Central America. The causative organism is 

 Leishmania hrazilicnsis but it is not known definitely which species of 

 Flehotomus carry the disease. It is possible that most of them are 

 capable of doing so. The statement has been made that the adults of 

 Flehotomus are nocturnal and that protection against disease may be 

 obtained by remaining indoors at night. Most of the nocturnal blood- 

 sucking flies may be found on the wing on dull cloudy days. 



The larvffi live in decaying vegetable matter, dung, or water and 

 are peculiar in possessing ])oth open spiracles and tracheal gills; the 

 head bears eye-spots; in the aquatic forms there are sucking discs on 

 the segments behind the head, but no feet. 



KEY TO GENERA 



1. Two longitudinal veins behind the posterior forked vein 2 



Three longitudinal veins behind the posterior forked vein 3 



2. Two forked veins in front of the middle of the wing.*Flebotomus Rondani 

 One forked vein in front of the middle of the wing (3).. .Maruina Miiller 



3. Wings with scales or scale-like hairs on the veins or membrane 4 



Wings with hairs only 5 



4. Wing membrane with broad scales over most of the surface. 



Parabrunettia Brunetti 

 Wings with scales on the veins only Brunettia Annandale 



5. Two longitudinal, unforked veins between the anterior and posterior 



furcate veins 6 



Only one longitudinal vein between the anterior and posterior furcate 

 veins (4) Trichomyia Haliday 



6. The second simple vein behind the anterior furcate vein ends in the 



tip of the wing ( 1 ) Psychoda Latreille 



The second simple vein ends behind the tip of the wing (2). 



Pericoma Walker 



Phlebotomus of authors. 



Psychodidie. — 1, Psychoda; 



figures 2-4. 



Pericoma; 3, Maruina; 4, Trichomyia. Hairs omitted from 



