MANSONIA PERTUEBANS 507 



Legs moderately long, rather stout, pale testaceous ; femora clothed with black 

 and white scales intermixed and numerous stiff black bristles, apical portions 

 entirely black scaled, a white spot at their apices, the hind femora with a white 

 ring at outer fourth; tibiae similarly clothed, the black scales more numerous 

 and the white tips larger, hind tibiae with a rather broad white band beyond 

 middle, the part beyond black scaled ; basal joint of hind tarsi black scaled, with 

 a white spot at base and a broad white ring medianly, the outer joints of hind 

 tarsi with basal halves white, apical halves black ; fore and mid tarsi similarly 

 marked, the banding narrower. Claw formula, 0.0-0.0-0.0. 



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



Male. Proboscis straight, moderate, slightly enlarged towards apex ; clothed 

 with black and white scales, white scales predominating centrally but not form- 

 ing a defined band ; apical third black. Palpi longer than proboscis, exceeding 

 it by nearly the length of the last joint ; with many very long, dense black hairs, 

 chiefly on under side of end of long joint and the two terminal joints ; clothed 

 with broad appressed scales, white and black and forming broad bands ; the base, 

 a ring before the middle, and apical part of the long joint black scaled ; apical 

 halves of last two joints black scaled. Antennae plumose; last two joints 

 long, black, clothed with dense cilia, the others short, white, with broad brown 

 basal rings ; tori globose, brown ; hairs of whorls long, dense, black with brown 

 luster. Coloration similar to the female. Wings narrower, the stems of the fork- 

 cells longer, the scales not as dense. Abdomen long and slender, depressed; 

 black scaled above, with narrow, ragged dull white basal Innately produced 

 bands, the eighth segment white scaled at sides ; lateral ciliation of rather long 

 and abundant pale-yellowish hairs. Tarsal white rings, particularly of front 

 and middle legs, broader than in the female, the last joint on all three pairs 

 nearly entirely white-scaled. Claws unequal on front and middle legs. Claw 

 formula, 2.0-3.0-0.0. 



Length : Body about 5.5 mm. ; wing 4.5 mm. 



Genitalia (plate 34, fig. 229) : Side-pieces conical, moderate, apical lobe un- 

 developed, basal lobe a triangular flap bearing a single very stout roundedly 

 ended spine which lies in center of side-piece parallel to its axis ; clasp-filament 

 strongly inflated on its outer half with a short terminal articulated spine ; harpes 

 slender, columnar, recurved at tip and furnished with six spines on outer side ; 

 harpagones wanting; unci short, thick, triangularly terminated, closely ap- 

 proximated at base and tip ; basal lobes rudimentary with a cluster of fine hairs ; 

 tip of the preceding segment with a row of eight long stout spines. 



Larva, Stage IV (see figure of the entire larva, plate 79). Head sub- 

 quadrate, mucli wider than long, eyes rudimentary ; autenuai long and slender, 

 a large hair-tuft beyond the middle arising from a notch, terminal portion 

 slender and much drawn out, one of the terminal hairs situated not far beyond 

 the tuft; dgrsal head-hairs all in multiple groups. Thorax transverse, rounded, 

 slightly angled at hair-tufts; hairs long, some single, some in multiple tufts. 

 Abdomen with the long lateral hairs single. Lateral comb of eighth segment of 

 about twelve spines in a single, irregular row; hair-tuft behind the comb of 

 three long hairs on a large tubercular plate. Air-tube about twice as long 

 as wide, the basal part broad and strongly convex, the apical portion attenuated, 

 anterior apical third channeled; two filamentous hairs arise from near base of 

 attenuated portion, the anterior wall of which is thick and finely dentate, ending 

 in terminal hooks ; no pecten, a single pair of hair-tufts at basal third. Anal 

 segment much longer than wide, ringed by a chitinous band ; dorsal tuft of many 

 long hairs, divided into a small and a large group on each side; lateral hair a 

 small tuft; ventral brush small, but of long hairs, situated behind chitinous 

 ring. Anal gills four, equal, slender and not as long as anal segment. 



