868 MOSQUITOES OF NORTH AMEEICA 



has disclosed the presence of from one to three setae on the postnotum of most 

 of our specimens. These setae are present also in Hwmagogus albomaculatus, 

 but not in other members of the genus (see page 864) . 



HWMAGOGUS ALBOMACULATUS Theobald. 



Hwmagogus albomaculatus Theobald, Mon. Culic, ill, 308, 1903. 

 Hwmagogus albomaculatus Theobald, Entomologist, xxxvi, 283, 1903. 

 Hwmagogus albomaculatus Blanchard, Les Moustiques, 413, 1905. 

 Hwmagogus regalis Dyar & Knab, Proc. Biol. Soc. Wash., xix, 167, 1906. 

 Cacomyia albomaculata Theobald, Mon. Culic, iv, 556, 1907. 

 Hwmagogus regalis Busck, Smiths. Misc. Colls., quart, iss.. Ill, 64, 1908. 

 Cacomyia albomaculata Theobald, Mon. Culic, v, 494, 1910. 

 Hwmagogus regalis Theobald, Mon. Culic, v, 493, 1910. 



Stegoconops albomaculatus Howard, Dyar & Knab, Mosq. No. & Centr. Amer. & W. 

 Ind., i, 53, 65, ii, pi. 23, fig. 163, pi. 126, fig. 439, 1913. 



OBIGINAI, DESCBIPTION of hwmagogus AiaOMACXTLATUS: 



Head blue, metallic; thorax shiny black, with bronze, green and blue scales; 

 abdomen metallic violet, the penultimate and antepenultimate segments with a 

 median patch of white scales, laterally with white basal spots, largest at the base 

 of the abdomen, forming almost a white line, venter basally white banded. Legs 

 unhanded, ungues equal and simple. Wings unspotted, the first sub-marginal cell 

 with its stem longer than the cell and the base of the second posterior cell nearer 

 the base of the wing than that of the first sub-marginal. 



?. Head black, covered with metallic blue fiat scales and with black bristles; 

 proboscis and palpi covered with deep blue and black metallic scales; antennae 

 black, basal joint deep brown, second joint with some dull peacock blue scales. 



Thorax shiny black (denuded), with fiat black, blue, and dull ochraceous scales 

 and some white ones in front of the roots of the wings, also a tuft of black scales 

 and numerous black bristles over the roots of the wings; back of the mesonotum 

 notched at the sides. Scutellum deep brown, with a few large central bristles and 

 several large lateral ones, very much separated from the mesonotum; pleurae with 

 flat silvery-white scales. 



Abdomen covered with rich metallic violet scales, the penultimate and the ante- 

 penultimate segments with a silvery-white median basal patch, laterally the seg- 

 ments have basal white elongated triangular spots, forming almost a distinct 

 lateral line; venter with basal white bands; the fourth segment with two large 

 posterior border-bristles, the fifth with one very long black bristle, arising from the 

 middle of the segment and passing over the sixth and with two border-bristles; re- 

 maining segments with a few much shorter ones. 



Legs unbanded, bronzy brown and metallic blue and violet, with numerous black 

 bristles; ungues equal and simple. 



Wings with brown scales and tinged with brown; the first sub-marginal cell very 

 slightly longer, but narrower than the second posterior cell, its base nearer the apex 

 of the wing than that of the second posterior cell, its stem a little longer than the 

 cell; stem of the second posterior cell, which is broad, nearly as long as the cell; 

 posterior cross-vein about twice its own length distant from the mid cross-vein; 

 scales at the base of the wing violet. Halteres with ochraceous stem and fuscous 

 knob. 



Length. — 5 mm. 



Habitat. — Cara Cara, Demerara River, and Pomeroon River, British Guiana (Dr. 

 Low). 



Observations. — Described from a single ? taken by Dr. Low. It differs from 

 H. cyaneus in the wing venation and in having two white median abdominal spots. 

 The curious abdominal chaetotactic character is also not seen in B. cyaneus, as 

 far as I have observed. 



Dr. Low sends the following note on this species: " The Indians from the Cabaca- 

 burl Mission on the Pomeroon river used to bring me samples of this species amongst 

 the mosquitoes they caught at nights. I also caught it myself at night two miles 

 below this, at PlckersglU. When sitting at a window in the police hut there they used 

 to come in and settle on me. Time, morning 9 to 11 A. M., during bright sunlight. 

 It would seem, therefore, that It bites by night and day. I often got them with 

 blood In their stomachs. I only dissected a few, and in those there was no trace of 

 embryos of F. demarguaii or F. perstans. Fairly common." 



Obiginal Description of Hwmagogus beoalis : 



Proboscis long, black; head and thorax brilliant metallic blue and green; pleurae 

 silvery; abdomen dark blue with silvery bands on all the segments above, broader 



