MEGARHINUS GUADELOUPENSIS 955 



with broad, flat, bright greenish-silvery scales. Postnotum brown, nude. 

 Pleurae and coxae luteous-brown, densely clothed with silver scales with a yel- 

 lowish tinge. 



Abdomen subcylindrical, dorsally depressed ; dorsal vestiture bluish-green at 

 base, passing into deep blue and then into violet-red on last two segments, a 

 series of segmental yellowish-silvery lateral spots, broadest basally ; first seg- 

 ment light metallic blue scaled with greenish reflections ; last segment with 

 black terminal bristles; no caudal tufts; venter entirely pale golden scaled. 



Wings broader than in any of preceding species, hyaline with a slight smoky 

 tinge, particularly on anterior portion ; basal cross-vein oblique, contiguous 

 with anterior cross-vein ; costal vein dark purple scaled. Halteres pale, with 

 dark silver scaled knobs. 



Legs slender, dark reddish-purple scaled ; femora brassy beneath : middle 

 tarsi with second segment white-marked on outer side ; hind tarsi with fourth 

 segment white marked to near apex. Claw formula, 0.0-0.0-0.0. 



Length : Body 8 mm. ; wing 6 mm. 



Male. Proboscis rather long, curved and tapering to a point. Palpi long, 

 about as long as the proboscis, slender; long joint about two-fifths the entire 

 length of the palpi, compressed, with a false articulation about two-fifths from 

 base, and dilated at apex ; penultimate joint about three-fifths the length of the 

 preceding and about equally stout, compressed ; terminal joint about as long as 

 long joint, slender, slightly curved and tapering to a point; vestiture deep 

 violet, false articulation and apices of all the joints but the last light shining 

 blue scaled. Antennas rather delicate, plumose, but much less densely than in 

 the other species; last two joints long and slender, the others short and stout, 

 cylindrical, luteous, with basal whorls of long, moderately abundant hairs; 

 second segment slightly over twice as long as the succeeding one and but a trifle 

 stouter, without crest of scales; tori black with silvery pruinosity. Clypeus 

 rather large and prominent, broadly rounded at the sides and very slightly pro- 

 duced at the middle, brown with silvery pruinosity. Mesonotum much denuded 

 in the unique specimen ; the remaining scales indicate a correspondence of the 

 thoracic pattern with that of the female. Abdomen elongate, depressed ; dorsal 

 vestiture dark blue with a greenish tinge at base; venter entirely pale golden 

 scaled. Wings slightly narrower than in the female ; costal vein bearing dull 

 coppery scales ; basal cross-vein oblique and reaching fourth vein nearly its own 

 length behind anterior cross-vein. Legs long and slender; vestiture nearly 

 black, with a violet reflection; bases and under sides of femora brassy. Claw 

 formula, 1.0-1.0-0.0. 



Length : Body 6 mm. ; wing 5 mm. 



Genitalia (plate 36, fig. 244) : Side-pieces over twice as long as wide, 

 sharply tapered to a narrow rounded apex ; basal lobe broad, rounded, clothed 

 with similar setae to those on side-pieces. Clasp-filament long and slender, 

 as long as side-piece, nearly uniform, smooth, with a long slender articulated 

 terminal spine and a few minute setae near tip. Harpes large, prominent, 

 narrow, concave, margins revolute, tip thickened and bent, pointed, and with a 

 few minute setae. Unci conical at base, tip produced into long points, dentate 

 within. Basal appendages forming a low broad rounded quadrate prominence, 

 with a tuft of setae at each angle. 



Larva, Stage IV (plate 127, fig. 443). Head subquadrate, slightly longer 

 than wide, sides nearly straight ; antennae on a slight prominence ; front deeply 

 emarginate at middle, a prominent lobe on each side of it. Antennae slender, 

 rather long, cylindrical, slightly curved ; two hairs and a small tuft before tip. 

 Mouth-brushes inserted beneath apices of anterior lobes, folded downward and 



