AEDES GR0S8BECKI 711 



and with many pale setas ; venter largely white scaled, posterior angles black and 

 on the posterior segments joined to a median black mark. Cerci black. 



Wings broad, slightly infuscated, especially on the costa; petiole of second 

 marginal cell shorter than its cell, that of second posterior cell about equal to its 

 cell ; basal cross- vein rather less than its own length distant from anterior cross- 

 vein; scales of the veins very broad, triangular, black and white evenly inter- 

 mixed, the black ones much the more numerous except on the subcostal vein; 

 outstanding scales comparatively small, lanceolate ; fringe unicolorous, blackish. 

 Halteres whitish, with white scaled black knobs. 



Legs moderate ; femora largely white scaled intermixed with black ones, which 

 predominate on upper side and towards tip ; knees white ; tibiee black and white 

 scaled nearly evenly intermixed, hind tibise blackish towards tip; tarsi black 

 with white basal rings, first joint with many yellowish white scales intermixed, 

 particularly at base and beneath, the other joints black with a broad white 

 basal ring; fore and middle tarsi with narrower rings, the last two joints of the 

 fore and the last of the middle ones entirely black. Claw formula, 1.1-1.1-1.1. 



Length : Body about 5.5 mm. ; wing 5 mm. 



Male. — Proboscis moderate, straight. Palpi longer than the proboscis, the 

 last two joints thickened; vestiture black, the long joint broadly banded with 

 white at middle, a large white mark near base and at apex; last two joints 

 largely white scaled except at tip ; long hairs at end of long joint and on last two 

 joints black and yellowish. Antennae plumose, the last two joints long and 

 slender, black, rugose, pilose, the others white, brown at enlarged insertions of 

 hair-whorls ; hairs of whorls long, dense, brown with yellowish luster. Color- 

 ation similar to the female. Wings narrower than in the female, the stems of the 

 fork-cells longer, the vestiture less abundant. Abdomen elongate, depressed, 

 atraight-sided, the segments more heavily banded with white at base; lateral 

 dilation long, abundant, pale yellowish. Claw formula, 1.1-1.1-1.1. 



Length : Body about 7 mm. ; wing 5 mm. 



Genitalia (plate 37, fig. 187) : Side-pieces over twice as long as wide, 

 rounded at tip; distal lobe rounded, very prominent, situated slightly sub- 

 apically, basal lobe quadrately expanded, with many small setae and a stout spine 

 at the base. Clasp-filament long and slender, slightly enlarged medianly, serrate, 

 with three small setas towards tip, a long terminal articulated spine. Harpes 

 elliptical, concave, inner margins thickened and revolute, apex narrowed and 

 terminating in a point which is bent outward. Harpagones with a slender col- 

 umnar stem, slightly curved, with a stout seta near the base and a long terminal 

 filament, broadly spatulate with a slender tip. Unci approximate, revolute, 

 forming a narrow, slender cylinder with rounded tip. Basal appendages small, 

 bearing several stout setae. 



Larva, Stage IV (see figure of the entire larva, plate 69). — Head rounded, 

 widest through eyes, a notch at insertion of antennae, the front margin broadly 

 arcuate. Antennae slender, slightly curved, well spined, a small tuft a little 

 before middle ; three irregular spines, a stout spine, and a digit on a pedicel at 

 tip. Upper pair of dorsal head-hairs in fours or fives, lower pair in threes ; 

 ante-antennal tufts multiple, large. Mental plate long and triangular, with a 

 central tooth and ten on each side, the basal ones more remote and pointed. 

 Mandible quadrangular, spined outwardly at base ; two filaments before tip ; an 

 outer row of cilia from a collar ; a dense row of filaments on outer margin ; den- 

 tition of four teeth on a process, the first the longest; a broad spine before, a 

 double tooth at base, a broad, smooth filament and row of feathered filaments 

 within ; process below widely furcate, with a row of hairs on outer margin and 

 a tuft at tip of each limb; basal angle distinct; a row of hairs with one detached 

 within and a basal row. Maxilla subspherical, divided by a suture ; inner half 

 with a row of stout spines on margin, becoming long towards apex and replaced 



