Genus Nyssorhynchus. 101 



Dr. A. Chalmers notes that there are rudimentary palmate 

 hairs on the first abdominal segment (and more rarely a very 

 rudimentary one on the thorax), at times well developed from 

 second to seventh inclusive. 



The pupa is 5 mm. long, pale green to light brown, changing 

 to dark brown. When nearing maturity the siphons are white, 

 also anal fins, which bear a long terminal curling seta. 



The pupal stage lasts just twenty-four hours in Ceylon (Major 

 Manders, H.A.M.C). 



This observer noticed that they invariably hatched out 

 between 7 p.m. and midnight, usually between 7 and 8 p.m. 



Economic Importance. 



Capt. James, I. M.S., has found that quartian, tertian, and 

 tertian malignant parasites will develop in this species artificially, 

 but it had not been found infected under natural conditions (Sc. 

 Mems. Ind. (N. S.), No. 2, p. 39, James). Major Adie has, 

 however, found the sporozoits in wild fuliginosiis (Ind. Med. Gaz., 

 xxxviii., July 7, 1903). 



Nyssoehynchus nivipes. Theobald (1903). 



The Entomologist, Vol. XXXVI., p. 258 (1903) ; Revis. Anop., p. 43 (1904), 



Giles. 



Thorax black, with snowy- white, spindle-shaped scales ; pleurae 

 mottled with dark and light brown ; abdomen black, hairy, with 

 pale scales on the last two segments and genitalia. Wings with 

 three large and three small basal costal spots, the third black 

 spot the largest, with three small spots beneath ; most of the 

 veins pale scaled, the fourth dark up to the fork. Legs deep 

 brown, the fore and the mid with apical pale bands, the hind 

 legs with the last three tarsals white and also the apex of the 

 preceding one. 



<£ . Head deep brown, with a tuft of snowy- white, upright, 

 forked scales and a slight pale border around the edges, two 

 snowy-white bristles projecting forwards and some brown ones 

 laterally ; antennae brown, with some flaxen and white plume- 

 hairs ; basal segments with brown and white scales ; palpi brown, 

 clavate, two white ventral patches on the apical swollen part and 

 some white scales ventrally on the remainder, and a few brown 

 lateral hairs on the last two segments. Proboscis thin and 

 black. 



