18 DIPTERA 



Characters, — Head clothed with flat scales and a few upright forked ones. Thorax with 

 narrow-curved and long almost hair like scales ; scutellum with flat scales only. Legs longish and simple. 

 Palpi of the q< thin, acuminate, with a few bristles, no hair tufts; those of 9 short The wings have the 

 third long vein carried on through the basal cell ; subcostal and first long vein densely scaled with 

 rather broad scales. Closely related to Stegotnyia but differ in q* palpi, venation and general appearance. 

 Larvae and pupae distinct from Stegomyia; they have short, barrel shaped siphons. 



Geographical distribution of species. — Three species are known. At present the genus is 

 confined to Asia and the East Indes. 



i. D. obturbans, Walker, Proc. Linn. Soc. Lond. Vol. 4, p. 91 (i860) (Ceylon, S. and N. India, Malay 

 Peninsula, East Indes, China. Japan, Formosa, Philipppines Islands). 

 centralis, Walker, Proc. Linn. Soc. Lond. Vol. 5, p. 144 (i860). 

 Culex obturbans, Walker. 



2. D. panalectros, Theobald, Mon. Culic. Vol. 2, p. 3i7 (1901) (Calcutta, Perak). 



3. D.fusca, Theobald, idem, Vol. 3, p. i35 (1903) (Kuala Lumpur, Philippines Islands). 



6. Genus STEGOMYIA, Theobald 



Stegomyis. Theobald, Mon. Culic. Vol. 1, p. 283 (1901). 



Characters. — Head covered with flat scales all over and a few upright forked scales. Thorax 

 with narrow-curved and almost spindle-shaped scales, scutellum with broad flat scales only. Palpi of 9 

 short, small; (f palpi rather thick with scanty tufts. Venation as in Culex but the fork-cells are rather 

 small. Scales of the wings broader than in Culex, dense as the apical portions of the veins. 



Larvae with rather short thick respiratory siphons. Eggs laid singly. One species (fasciata) is 

 the yellow fever carrier. 



Geographical distribution of species. — The genus occurs in tropical, subtropical and 

 warmer temperate zones, to about 48 on each side of the Equator. 



1. S. fasciata, Fabricius, Syst.Antl. 36. i3 (i8o5)(N. and S. America, West Indes, Asia, Australia, Most 



Oceanic Islands, S. Europe, Africa). — Plate I, Fig, 1 1. 



/rater. Robineau-Desvoidy, Essai Culic. p. 407 (1827). 



taeniatus. Wiedemann, Ausseuroop. zweifl. Ins. p. 10 (1828). 



konuoupi, Brulle, Ann. Soc. Nat. Paris, Vol. 23 (i83i) (Morea). 



formosus, Walker, List Dipt. Brit. Mus. p. 4(1848). 



excitans, Warkerv'trrs. Saund. p. 4J0 (-1-856); 



viridiirons, Walker, List. Dipt. Brit. Mus. p. 3 (1S48). 



inexorabilis, Walker, idem, p. 4 (1848)-^. 1 



annuiitarsis, Macquart, Dipt. Exot. tt». 1, (i83£).^6 



zonatipes. Walker, Proc. Linn. Soc. Lond. Vol. 2. p. 229. 



exagitans, Walker, Ins. Saund. p. 430 (i856). 



impatabilis. Walker, Journ. Proc. Linn. Soc. Lond. Vol. 3, p. 91 (i860). 



baitcroftii, Skuse, Proc. Linn. Soc. N. S. Wales, Vol. 3, p. 1740 (1SS6). 



mosquito, Arribalzaga, Dipt. Arg. p. 60 (1891). 



clegans. Ficalbi, Bull. Soc. Ent. Ital. p. 25i (1896). 



rossii, Giles, Journ. Trop. Med. p. 64 (1899). 



toxorhynchus , Macquart, Dipt. Exot. Vol. 1, p. 73 (i838). 



calopus, Meigen, Syst. Beschr. Europ. Zweit. Ins. Vol. 1, p. 3 (1818) ? 

 ■oar. mosquito, Robineau-Desvoidy, Ess. Culic. p. 407 (1827). 



var. luciensis, Theobald, Mon. Culic. Vol. 1, p. ig5 (1901). . 



var. queenslandensis. Theobald, Mon. Culic. Vol. 1, p. 297 (1901). 



2. 5. africana, Theobald, Mon. Culic. Vol. 1, p. 304 (1901) (West and Central Africa). 



3. S. thomsoni, nov. sp. (1) (N. W. Provinces, India). 



(1) Sirgi-myia t/imnsrwi ', nov. sp. 



Front of mesothorax pure silvery white, with a brown eye like spot on each side, remainder of mesonotum with many white scales, but with 

 some yellowish-brown ones over the roots of the wings. Head silvery white. Proboscis black with a broad median white band. Abdomen blackish with basal 

 white dagger-shaped median patches : fore legs brown with a white spot on the base of the metatarsi ; mid legs with metatarsi white basally and apically, 

 also the first tarsal: hind legs with white apical femoral spot, a white spot on basal half of the tibia, base of metatarsus broadly white and the other 

 cegments with basal white bands. Length 3-5 mm. Habitat ; N. W. Provinces, India. 



