PSOROPHORA JAMAICENSIS 581 



Psorophora discolor agrees in structure and appearance with other members 

 of the Janthinosoma group, the male genitalia being perfectly typical. The 

 larvae also in the structure of the comb and otherwise agree perfectly, but in the 

 air-tube and antennse they differ widely. All the other Janthinosoma larvae 

 have the antennae long, but slender, the air-tube more or less conspicuously in- 

 flated. In this species the air-tube is small, not inflated, while the antennae 

 are markedly inflated and distorted. We surmise that the inflated portion serves 

 as an air reservoir, enabling these larvse to remain longer beneath the surface 

 than they otherwise could, and it is therefore immaterial whether the air-tube 

 or the antennae are used as such a reservoir. It is a case of the adaptation of 

 difi^erent organs for a similar purpose. Other species, as Orthopodomyia 

 signifer, have an enlargement of the tracheal tubes in the thorax. This differ- 

 ence, at first sight striking, appears to be but one of adaptation, and without 

 special classificatory significance. The erection of a separate genus for discolor 

 was, therefore, unwarranted. 



PSOROPHORA JAMAICENSIS (Theobald). 



Culex perturbans Coquillett (not Walker), Proc. U. S. Nat. Mus.. xxii, 250, 1900. 

 Culex perturbans Coquillett (in part, not Walker), U. S. Dept. Agr., Div. Ent., 



Circular 40, 2d ser., 6, 1900. 

 Culex perturbans Howard (in part, not Walker), U. S. Dept. Agr., Div. Ent., Bull. 



25, n. s., 20, 30, 1900. 

 Culex jamaicensis Theobald, Mon. Culic, i, 345, 1901. 

 Culex jamaicensis Giles, Gnats or Mosq., 2 ed., 394, 1902. 

 Grabhamia jamaicensis Theobald, Mon. Culic, iii, 244, 1903. 

 Culex jamaicensis Taylor, Rev. de Med. Trop., iv, 109, 119, 166, 172, 1903. 

 Culex jamaicensis and Culex perturbans Pazos, Bull. Soc. Ent. France, 1904, 134, 1904. 

 Orabhamia jamaicensis Felt, Bull. 79, N. Y. State Mus., 391&, 1904. 

 Culex jamaicensis Coffin, in Shattuck, The Bahama Ids., 283, 1905. 

 Feltidia jamaicensis Dyar, Proc. Ent. Soc. Wash., vii, 47, 1905. 

 Culex jamaicensis Blanchard, Les Moustiques, 279, 1905. 

 Orabhamia jamaicensis Blanchard, Les Moustiques, 397, 1905. 

 Orabhamia jamaicensis Theobald, Mosq. or Culic. of Jamaica, 29, 39, 1905. 

 Ch-abhamia jamaicensis Coquillett (in part), U. S. Dept. Agr., Bur. Ent., Tech. Ser. 



11, 21, 1906. 

 Janthinosoma jamaicensis Dyar & Knab (in part), Journ. N. Y. Ent. Soc, xiv, 183, 



1906. 

 Tcpniorhynchus walsinghamii Theobald, Mon. Culic, iv, 484, 1907. 

 Aedes jamaicensis Pazos, San. y Ben., ii, 46, 315, 1909. 

 Grabhamia jamaicensis Theobald (in part), Mon. Culic, v, 281, 1910. 

 Tceniorhynchus walsinghamii Theobald, Mon. Culic, v, 419, 427, 1910. 



Original Desckiption of Culex jamaicensis : 



Thorax dark brown, with four round patches of creamy scales and a few pale ones 

 before the scutellum. Abdomen dark brown, with pale scaled apical bands, those 

 of the second segment forming a triangular pale patch, the next four with the patches 

 broken in the middle; last segment black; venter mostly yellow-scaled. Wings with 

 black and white scales; a small black spot at the third long vein. Legs brown, 

 banded, and speckled with yellowish scales; tarsi basally banded white. 



$. Head brown; occiput with scattered curved cinereous scales and black upright 

 forked ones, white and black flat ones at the sides of the head and numerous black 

 bristles; clypeus chestnut-brown; eyes silvery; antennae brown, basal joint large, 

 pale brown, arising from a dark area; first and second joints with apical grey scales; 

 palpi brown, with some yellowish scales, white at the apex, with moderately long 

 dark bristles; proboscis black at the tip and slightly darker at the base, the middle 

 with yellowish scales thickly spread over the brown surface. 



Thorax very dark brown, with long brown hairs and with deep coppery-brown 

 curved scales and a few black bristles; four round patches of creamy scales and a 

 few of the same colour in front of the scutellum ; the latter with pale curved scales 

 and deep brown border-bristles; metanotum deep brown; pleurae with patches of 

 grey scales. 



Abdomen black, the first segment with a few apical creamy scales and long yel- 

 lowish-brown hairs; second segment with a distinct creamy patch of apical scales 

 forming a triangle with its base parallel with the apical border; next four segments 



