GENUS PHLEBOTOMUS 179 



in the genus Phlebotomus is longer, and is armed for piercing ; the 

 ovipositor is hidden ; the male genitalia consist of three pairs of 

 appendages. 



WILLISTON'S KEY TO THE COMMON GENERA 



1. Two simple longitudinal veins between the forked veins ..... 2 

 One simple longitudinal vein between the forked veins ..... 4 

 2- The first simple vein arises from the forked vein much beyond 



the anterior cross-vein Phlebotomus. 



(Phlebotominae). 

 The first simple vein arises near the anterior cross-vein ..... 8 



3. The second simple vein ends at, or near the tip of the wing . Psycho da. 



(Psychodinae). 

 The second simple vein ends distinctly beyond the tip of 



the wing Periconia. 



(Psychodinae). 



4. The seventh longitudinal vein (the most posterior one) is not 



much shorter than the sixth Trie horn yia. 



(Phlebotominae). 

 The seventh longitudinal vein is very short . . . Sycorax. 



(Phlebotominae). 



Phlebotomus is often confused with Psychoda and its allies, but the 

 following points will help to distinguish them : 



Psychoda : small stumpy flies with short legs and bushy wings, 

 Phlebotomus : more elongated and have longer legs and narrower wings, 

 which are nearly always held away from the body. Should there still 

 be any doubt, drop a specimen of the fly into two per cent caustic potash 

 solution, clear it and mount it entire, or dissect off the head and 

 mount it alone. In Phlebotomus the mandibles and maxillae are serrated 

 and obviously formed for piercing ; in Psychoda they are poorly developed 

 and not formed for piercing. 



GENUS PHLEBOTOMUS, RONDANI 



Small psychodids with relatively large hairy wings which are held 

 upright, and are devoid of scales. Palpi of five joints, cylindrical 

 in shape ; according to Newstead the third palpal segment of some 

 species is provided with minute spines, probably of a sensory nature. The 

 spines may be squamiform and with short pedicels (P. minutus) or sapth- 

 uliform and with long curved pedicels (P. papatasi}. Antennae long and 

 slender, consisting of sixteen segments, the first short and thick, the second 

 rounded, the third the longest, and the remainder swollen at their proximal 

 ends; in some species several of the segments have geniculated spines 

 (Newstead). Proboscis longer than the head, and conical in shape 



