464 MosQxnTOES or north America 



Male. — Proboscis gradually swollen towards tip, straight. Palpi slender, 

 nearly as long as proboscis, nearly uniform, with black setae at apex of long joint 

 and on last two joints, black scaled, a narrow pale ring before middle of long 

 joint. Antennse rather long, sparsely plumose ; last two joints long and slender, 

 rugose, pilose, black, the others shorter, but rather longer than usual, whitish, 

 with black riugs at insertions of hair- whorls ; hairs long, not very dense, brown. 

 Coloration as in female. Wings scarcely narrower than in the female, the stems 

 of the fork-cell very little longer, vestiture about the same. Abdomen com- 

 pressed, with dorsal yellowish bands, as in the female ; setae at ends of segments 

 coarse, yellowish; no lateral ciHation. Claw formula, 1.0-0.0-0.0. 



Length : Body about 4 mm.. ; wing 3 mm. 



Genitalia (plate 10, fig. 66) : Side-pieces over twice as long as broad, tips 

 conically tapered; lateral process arising from near middle, long, rather thick, 

 columnar, bearing at tip three closely united leaf -like expansions; clasp-filament 

 enlarged at tip, with a rounded excavation above crossed by a spine, from base 

 of which another spine projects; apex extending beyond excavation, hirsute, 

 with a terminal spine. Harpes with a slender inner area bearing a short comb 

 of teeth at its tip, other plates of harpes and harpagones comparatively few and 

 simple. Basal appendages small, each with three hairs. 



Larva, Stage IV (plate 113, fig. 384) . — Head subquadrate, rounded, about as 

 wide as long, sides flat; antennae slender, rather long, uniform, with a minute 

 tuft beyond middle; hooks on labrum large; dorsal head-hairs forming a nearly 

 straight row across between antennae, the upper pair multiple, the lower pair in 

 fours, the ante-antennal tuft multiple. Body with the skin glabrous; lateral 

 hairs of abdomen in fours on first segment, in twos on second, single on third to 

 sixth segments. Comb of eighth segment of six to eight single spines in a 

 straight row. Air-tube about seven times as long as wide, tapering to tip; pecten 

 of three to six short teeth near base of tube; a row of nine hair-tofts along 

 posterior margin, formed of two approximated series, none near base or apex, 

 but a very minute tuft towards apex and another on dorsal aspect. Anal seg- 

 ment longer than wide, ringed by the plate ; dorsal tuft of four hairs of different 

 lengths on each side; ventral brush well developed, confined by the chitinous 

 ring. Anal giUs about twice as long as the segment, ensiform. 



All our larvae were found in bamboo- joints that had been artificially prepared 

 to catch rain water. They probably normally occur in water in broken bamboos, 

 as Dr. Lutz describes their occurrence in such locations in Brazil. 



Central America to southern Brazil. 



Tabemilla, Canal Zone, Panama, May 21, 22, June 17, July 18, 1907 (A. 

 Busck) ; July 24, 30, August 14, 28, December 15, 1908 (A. H. Jennings). 

 Also reported from Para, Rio de Janeiro and Sao Paulo, Brazil (Lutz, Theo- 

 bald, Peryassu). 



CARROLLIA URICHII (Coquillett) Dyar & Knab. 



Melanoconion urichii Coquillett, Can. EJnt., xxxviii, 61, 1906. 



MocMostyrax urichii Dyar & Knab, Journ. N. Y. Ent. Soc, xiv, 223, 1906. 



Mochlostyrax urichii Dyar, Proo. Ent. Soc. Wash., vlii, 18, 1906. 



Melanoconion urichii Coquillett, U. S. Dept. Agr., Bur. Ent., Tech. Ser. 11, 23, 1906. 



OarroUia urichii Dyar & Knab, Can. Ent. xli, 101, 1909. 



Melanoconion ( ?) urichii Theobald, Mon. Cullc, v, 458, 1910. 



Obiqinal Descbbption of Melanoconion UBicnn: 



Proboscis and palpi black scaled, occiput yellow scaled. Thorax thinly black 

 scaled, the median part of the posterior half chiefly yellow scaled, the bristles on 

 this part and on the scutellum yellow. Abdomen black scaled, the venter with a row 

 of large violet spots on either side of segments from two to six, the middle of the 

 venter golden-yellow scaled except on the narrow hind margins of the last four 

 segments. Legs black scaled, with a purplish tinge, the under side of the femora. 



