PHLEBOTOMrS. -^'^ 



one-iointed, and much smaller, generally thin and leaf-bke the 

 lower pair are one-jointed, but narrow and elongate sl.ghth 

 curved These latter arise from a subgenital plate which repre- 

 sents the ventral surface of the ultimate abdominal segment the 

 upper parts being absent. A flexible, very slender "^troii^ittent 

 organ is present, projecting from between the intermediate appen- 

 da|es, and consists of a pair of very slender delicate valves from 

 wlfich a pair of chitinous filaments can be extended In the 

 female the external genitalia are simple, "consisting of two pairs 

 (a superior and an inferior pair) of compressed more or less leat- 

 ike appendages covered with sensory hairs (^'"'^^^"^^ ' J*^^-l 

 become distorted in dried specimens, but may be restored by 

 maceration m caustic potash. * There is "« ^«F^-\^"P°^' ^^/^"^ 

 Pstchodix,t:. Legs long and slender, clothed with small scales 

 and pubesceuce ; cox^ lengthened, tibiae with small apical bristles. 

 The relative lengths of the different joints of the legs vary accord- 

 ing to the species, t Wings rather narrow, varying with the 

 species, lanceolate, or with the tip more or less pointed Auxi hary 

 vein verv short, ending in the costa much before one-third o the 

 wiua^s length ; 1st longitudinal vein ending at about two-thirds 

 of ^he wing; subcostal cross-vein at tip of auxiliary vein; the 

 '^nd lon-itudmal vein forked near the middle, the upper branch 

 loain forked at or before half its length : 3rd vein originating 

 near base of -ving (at least in basal third ot wmg), ending at tip 

 of wing: anterior cross-vein always at basal angle of .3rd vein 

 4th vein forked more or less near its middle, the fork sometimes 

 before, sometimes bevond the fork of the 2nd vein, according to 

 the species ; 5th and6th veins long, 7th absent or extremely short. 

 All the veins nearlv straight or only gently curved. The sing.e 

 ba^al cell verv shorf . Posterior cross-vein probably present ^ in 

 all species. bJt indistinct. § All the veins finely pubescent, but 



* In the descriptions of the genital organ? under each species I am indebted 

 almos° IhoUv to ?he work of Dr. Annandale, and to a gre.t extent also ni the 

 descriptions of other specific characters. -.in, „u»„ tl,« 



7 How much value may be placed on these proport.onate l^g^^s when the 

 differences are verv slight it is i.npos^ble at present to say. It is best not to 

 place too much reliance on fractional differences. 



^ : Schiner savs it is absent, but so many figures ha-e come before me wrth 1 

 present that it probablv does exist though seen with difficulty. It is hardly 

 likelv to be present in soma species and absent in others. 



8 Xewsteld makes several errors in his terminology of he ^ "g^- /^e 

 •• subcosta •• (or auxiliary vein) does not turn down into the 1st longitudinal, Wt 

 «;,into the costa. the small connecting vein b«'"g ^'^^^''^^^^^ ^I^^™"^,,: J^„^^ 

 expression that the 2nd longitudinal - extends almost to the base of the wmg 

 L uuscientific. as all veins b\i» at their nearest pomt to the base of the wi„g. 

 not vice versa. The 3rd longitudinal d.^ not '• originate from the ^id cros»- 

 vein.'- but turns out of the 2nd at the usual angle, the ^-'^^rj^-^^; J/SJ; 

 nectincr it at the point of angulation with the 4th vem. He speak» of the oth 

 veTn" curing upwards and uniting with the 4.h" i^f'piV^^'fy'ZtnS^^^- 

 the vein to startfrom the margin of the wing Vf'"'^°^- ri'nStSa nea; 

 whereas if there is a short vein joining tlie 4th and oth longitudinal near 

 Thelr^ases. it is the posterior cross-vei.. H.s remaining remarks are therefore 

 erroneous, consequent on his misnaming the vems from the tirst. 



