550 MOSQUITOES OF NORTH AMERICA 



Ventral tufts of 18-20 pairs. A pair of tufts and long simple setae dorsally. Anal 

 gills very long, narrow, pointed, 2 1/2 times as long as the longest hairs of the ventral 

 brush. Pupa with short, stout siphons. 



Observations. Four living larva? of this handsome species were taken from a 

 temporary pool in a logwood thicket, about 5 3/4 miles along the Molynes Road, 

 near Kingston, early in April, 1906. The larva is large and stout, the head, which is 

 much compressed antero-posteriorly, is set at right angles to the thorax, and the 

 large antennae are carried almost vertically downwards, giving the larva a peculiar 

 appearance. The description of the larva is drawn up from the larval skin casts, 

 that of the adult head, thorax and abdomen from the freshly-killed specimens. A 

 notable feature in the male is the thickly-scaled second antennal joint. 



Obiginal Description of Janthinosoma sayi, variety jamaicensis: 



A series of five $'s taken by Lord Walsingham exactly resemble the typical sayi, 

 but in all the specimens the last two hind tarsals only are white, the white not 

 spreading at all on to the apex of the second tarsal segment, as seen in sayi. 



Habitat. Runaway Bay (Lord Walsingham); Kingston, Jamaica (Dr. Grabham). 



Time of capture. April and July. 



Note. It is possibly a distinct species. 



Origin At. Description of Janthinosoma centrale: 



$ Cabeza negra, occipucio, mejillas, base de los palpos, de las antenas y de la 

 trompa testaceos; escamas detrds de los ojos doradas, las erguidas en tornillo, las 

 recostadas hacia los lados fusiformes. Antenas pardas con vellosidad y pelos 

 verticilados del mismo color. Trompa parda hacia la extremidad. Palpos cortos con 

 escamas azul obscuro. Torax piceo con escamas doradas fusiformes esparcidas en el 

 dorso y algunos pelos largos hacia la parte posterior. Escudete y metanoto testS,- 

 ceos obscuros, el escudete con tres grupos de pelos largos. Abdomen negro, 

 por arriba de un violeta purpura y por debajo con escamas doradas excepto los 

 fingulos anteriores de cada segmento que son invadidos por las escamas obscuras 

 como en el dorso. Alas un tanto parduzcas con escamas pardas; en la costa sobre 

 todo y en la 1* vena longitudinal hay escamas negras. Las dos horquetas nacen al 

 mismo nivel. Patas de un purpuero-azulado, coxas y femures (6stos en mds de su 

 mitad basal) testaceos. Los tarsos posteriores tienen sus 4? y 5? artejos asl como 

 la misma extremidad del tercero blancos. 



Long.: 6,5 mm. 



Hab. : Buenos Aires e islas del Parana. 



Description of Female, Male, and Larva of Psobophora posticatus : 



Female. Proboscis moderate, cylindrical, uniform, labellse small, conical; 

 vestiture of appressed blue-black scales and small curved black setae, those on 

 labellge more prominently outstanding. Palpi about one-fourth as long as pro- 

 boscis, clothed with blue-black scales, brilliant violet ones at tip, and a few long 

 setae at base. Antennae slender ; tori subglobose, with an excavated tip, smooth, 

 pale brown within and beneath, blackish above ; second joint a little longer than 

 the following ones, blackish, setose ; hairs of whorls sparse and rather long 

 basally. Clypeus elongate, prominent, tapered in front, convex, dark brown, 

 shining, nude. Eyes black. Occiput narrow, anterior half devoid of scales, 

 blackish, with a number of bristles; posterior heilf yellowish, densely clothed 

 with erect, golden-brown, forked-tipped scales, some broad and flattened yellow 

 scales intermixed, the sides with flat, broad yellowish scales ; cheeks silvery white 

 scaled. 



Prothoracic lobes large, well separated, with black bristles and a tuft of flat 

 golden-yellow scales at apex. Mesonotum yellowish brown, broadly black cen- 

 trally, uniformly and rather densely covered with flat, broad, pale golden-yellow 

 and lanceolate dark brown scales intermixed and rather short black bristles; 

 there is a small ante-scutellar bare space but no subdorsal bare stripes, Scu- 

 tellum trilobate, with flat golden-yellow scales and a group of about eight black 

 bristles on each lobe. Postnotum roundedly tapered behind, dark brown, nude. 

 Pleurae brown, covered with flat white scales ; coxae pale brown with white scales, 

 a few black scales on anterior pair and short black bristles. 



