516 MOSQUITOES OF NORTH AMERICA 



curved, shining, silvery scales on lateral area of disk midway between pro- 

 thoracic lobe and root of wing; bristles coarse and black, denser before wing 

 insertion; lateral margins with small, narrow, curved black scales and a similar 

 vestiture surroimding ante-scuteUar bare space. Scutellum trilobate, each lobe 

 with a group of bladi bristles, mid lobe basaUy with curved silver scales and 

 black ones distally. Postnotum nude, dull luteous, blackish at base. Pleurae 

 and coxae yeUowidi brown, with small patches of silver scales and a few black 

 bristles. 



Abdomen subeylindrical, depressed, terminal segments slightly tapering, the 

 last rather sharply truncate and with many coarse hairs; dorsal vestiture of 

 blue-black scales; on sides a row of basal segmentary triangular patches of 

 brilliantly bluish- white silvery scales; first segment with a patch of black scales 

 and numerous yellowish hairs; venter mostly dark scaled, with a number of 

 rather coarse yellowish bristles and a few silvery-white scales which tend to form 

 basal bands, especially centrally. 



Wings moderate, slightly smoky, veins very slightly darker; petiole of second 

 marginal cell about half the length of that cell, that of second posterior cell 

 nearly equal in length to the cell ; basal cross-vein more than its own length dis- 

 tant from anterior cross-vein; vestiture of dense, obsoletely truncate, elongate- 

 ovate and broadly lanceolate, blackish-brown scales; fringe of same color; a 

 minute silver spot near base of first vein. Halteres with basal part of stems 

 pale, knobs blade, with a patch of silvery-white scales on one angle. 



Legs slender and rather long, black scaled ; femora pale-yellow scaled beneath, 

 with small white tips ; mid and hind pair with a small silver spot at outer third ; 

 fore pair with a pale ring at outer third ; tibiae more narrowly pale beneath, with 

 a silver tip on upper side ; hind tarsi with white bands involving both ends of 

 joints, basal portions of bands on hind tarsi broad, the last tarsal joint entirely 

 white on upper side ; front and middle tarsi with first two joints narrowly white- 

 ringed at their bases, the succeeding joints entirely black scaled. Claws small. 

 Claw formula, 0.0-0.0-0.0. 



Length : Body about 4.5 mm. ; wing 3.75 mm. 



Life history and habits unknown. 



Panama. 



Bocas del Toro, September 25, 1903 (P. Osterhout). 



The lateral spots of abdomen have iheir apices resting on the bases of the 

 segments, the broadest part distally. 



MANSONIA TITILLANS (Walker) Blanchard. 



Oulex titiUans Walker, Cat. Brit. Mus., Dipt., 1, 5, 1848. 



TcBniorJiynchus tmniorhynehus Lynch Arrib&lzaga (not Culex tmniorhynchua Wiede- 

 mann), Rev. Mus. de La Plata, 11, 148, 1891. 



Culex titilans Giles, Gnats or Mosq., 233, 1900. 



Culex tceniorJiynchus Giles (in part, not Wiedemann), Gnats or Mosq., 245, 1900. 



Panoplites titillans Theobald, Men. Culic, 11, 175, 1901. 



PanopUtes titillans Giles, Gnats or Mosq., 2 ed., 352, 1902. 



Mansonia titillans Neveu-Lemaire, Archiv de Parasitol., vi, 20, 1902. 



Mansonia titillans Theobald, Mon. Culic, ill, 273, 1903. 



PanopUtes pseudotitillans Parker, Beyer & Pothier (not Theobald), Yell. Fever Inst, 

 Bull. 13, 37, 1903. 



Mansonia titillans Lutz In Bourroul, Mosq. do BrasU, 69, 1904. 



Mansonia titillans Pazos, Bull. Soc. Ent. France, 1904, 135, 1904. 



Mansonia titillans Blanchard, Les Moustiques, 377, 1905. 



Mansonia titillans Theobald & Grabham, The Mosq. or Culic. of Jamaica, 33, 1905. 



Tmniorhynchus titillans Dyar, Proc. Ent. Soc. Wash., vil, 47, 1905. 



Mansonia titillans Goeldl, Os Mosq. no Par&, 114, 1905. 



Mansonia titillans Felt, Bull. 97, N. Y. State Mus., 462, 190B. 



Mansonia titillans Coquillett, U. S. Dept. Agr., Bur. Ent., Tech. Ser. No. 11, 25, 1906. 



