CTJLEX 8IMILIS 339 



conical, divided by a suture ; inner half with a row of spines along margin and 

 two rows of cilia within ; a row of long hairs at apex running down along the 

 suture ; outer half with two filaments near middle, a spine on other side and a 

 row of small serrations on margin. Palpus small, tapered, with four minute 

 digits at tip. Thorax rounded, wider than long; abdomen moderate, anterior 

 segments shorter ; sldn with slightly elongate granules ; lateral hairs multiple 

 on first two abdominal segments, double on third to sixth ; subdorsal hairs double 

 on third to sixth segments ; tracheae broad. Air-tube stoiit, distinctly tapered on 

 outer half, three and a half times as long as wide ; pecten of about nine teeth, 

 reaching one-third of tube ; single tooth a broad spiue with three basal branches ; 

 four large hair-tufts on posterior aspect of tube, and a fifth on sides between last 

 two. Lateral comb of eighth segment of many spines in a trianguar patch; 

 single spine elongate, widened at tip and fringed with spinules. Anal segment 

 as long as wide, ringed by the plate ; dorsal tuft a group of long hairs on each 

 side ; a single lateral hair ; ventral brush well developed, confined to barred area, 

 posteriorly situated. Anal gills moderate, about as long as anal segment, rather 

 blunt at tips. 



The larvffi live in ground-pools of foul water. Mr. Busck bred the type speci- 

 men from a lagoon pool of dirty ill-smelling water, associated with Culex coro- 

 nator. The larva resembles that of Culex quinquefasciatus but is distinguish- 

 able on minor characters. The adult, which we know only from a single female, 

 is also distinct. 



Island of Trinidad, West Indies. 



South coast of Trinidad, June 30, 1905 (A. Busck). 



CULEX SIIVIILIS Theobald. 



Culex nigritulus Taylor (not Zetterstedt) , Rev. de med. trop., iv, 107, 117, 165, 171, 



1903. 

 Culex similis Theobald, Mon. Culic, ill, 207, 1903. 



Culex nigritulus Pazos (not Zetterstedt), Bull. Soc. Bnt. Prance, 134, 1904. 

 Culex scolasticus Pazos (not Theobald), Bull. Soc. Ent. France, 134, 1904. 

 Culex similis Theobald, Journ. Econom. Biol., i, 33, 1905. 

 Culex similis Theobald, Mosq. or Culleld. Jamaica, 26, 1905. 

 Culex factor Dyar & Knab (in part), Journ. N. Y. Ent. Soc, xiv, 212, 1906. 

 Culex regulator Dyar & Knab, Journ. N. Y. Ent. Soc, xiv, 206, 213, 1906. 

 GrabJiamia scJiolasticus Coquillett, U. S. Dept. Agr., Bur. Bnt., Tech. Ser. 11, 21, 1906. 

 Culex palus and Culex similis Coquillett, U. S. Dept. Agr., Bur. Ent, Tech. Ser. 11, 



23, 1906. 

 Culex similis Theobald, Mon. Culic, iv, 448, 1907. 

 Culex similis Aiken, Brit. Guiana, Med. Annual, xv, 64, 1907. 

 Culex aikenii Dyar & Knab (in part), Proc. U. S. Nat. Mus., xxxv, 61, 1908. 

 Culex lachrimans Dyar & Knab (in part). Smiths. Misc. Colls., quart, iss., lii, 259, 



1909. 

 Culex similis Dyar & Knab, Proc. Ent. Soc. Wash., xi, 37, 1909. 

 Culex similis Pazos, San. y Ben., ii, 49, 557, 1909. 

 Culex palus Pazos (not Theobald), San. y Ben., ii, 50, 1909. 



Culex aikenii Aiken (in part, not Aiken), Brit. Guiana, Med. Annual, 1908, 9, 1909. 

 Culex similis Theobald, Mon. Culic, v, 361, 1910. 

 Culex aikenii Theobald, Mon. Culic, v, 616, 1910. 



Obiginai, Desceiption of Cuij;x similis : 



Thorax reddish-brown, with a very minute dull golden brown and a few black 

 scales, and three double rows of black bristles ; pleurae pale ochraceous ; metanotum 

 pale. Abdomen deep brown, with narrow pale basal bands, which on the last three 

 segments spread out laterally. Legs deep brown, unhanded, coxae and venter of 

 femora pale; ungues small, equal and simple. Wings with typical Culex scales; 

 stem of the first sub-marginal nearly half the length of the cell. 



2. Head brown, covered with narrow-curved very pale creamy scales and flat 

 lateral ones and with numerous black upright forked scales; antennae deep brown, 

 with brown verticils and pale pubescence, basal joint and base of the second joint 

 pale testaceous; palpi deep brown; proboscis deep brown, apex testaceous. 



