82 



joint beneath with scattered white scales; terminal joints entirely black. Claw for- 

 mula 1.11.11.1. 



Length: Body about 5.5 mm. 



Male: Proboscis slender, rather long, straight, black. Palpi almost of the length 

 of proboscis, perhaps a little longer; end of long joint swollen dirty-white; the first 

 long joint yellow, black at apex; the second yellow, black at base, the last two joints 

 black with long black hairs with silky luster. Coloration similar to the female. Abdomen 

 elongate, broadest on sixth and seventh segments, narrowest at third; white basal 

 bands almost as in female, but first segment more black; lateral ciliation long, 

 abundant, pale yellowish brown. Wings narrower than in female; stems of the 

 fork-cells longer; vestiture less abundant. Claw formula 2.1 2.1 1.1. 



Length: Body about 6 mm. wing 5 mm. 



Male genitalia. Side pieces almost three times longer than wide; apical lobe well- 

 developed, with some few rather short hairs. Clasp-filaments slender, slightly ex- 

 panded in the middle and bearing a long articulated terminal spine. Stem of harpa- 

 gones very long, columnar; blade broad in middle, bearing only one median ridge. 



Larva: Head rounded, strongly vaulted, wider than long with a slight notch 

 at insertion of antennae;, front margin feebly arcuate; antennae short, thin, black, 

 from base to apex slightly spinose, with the small antennal tuft (four hairs) in- 

 serted almost in the middle of the antennae. Anteantennal tuft only triple; lower 

 and upper frontal tuft consisting of only one hair. Medially and laterally are three 

 areas with a remarkable warble structure. 



Thorax subquadratic, angled at hair tufts ; hair formula of frontal border most 

 probably 3131221313, one of the hairs in tuft two, strong, the other feeble and 

 short. Lateral hairs in multiple tufts, and some single strong hairs. 



Abdominal segments rather broad, the first of them shorter than the last. 

 Lateral hairs on the first and second segments triple; on the third to seventh double. 

 Tuft of eighth segment in common arrangement; lateral comb consisting of about 

 twenty-five scales, arranged triangularly in two or three rows, the scales end in a 

 single strong spine, furnished at its base with two other shorter spines and with 

 the basal part fringed by numerous small hairs or bristles. Sipho almost three times 

 longer than broad, tapering at apex; pecten consisting of about twenty thorns, 

 furnished at base with three or four lateral teeth; between the tuft situated almost 

 in the middle of the sipho and the apex two single thorns, without teeth and with 

 much wider distance between than the teeth of pecten; a single short thorn dor- 

 sally near the apex of the sipho. - - As fig. 6b indicates, the free thorns are inser- 

 ted unsymmetrically, and their place differs from individual to individual; one side 

 may also have a thorn more than the other. Anal segment almost as long as wide; 

 the dorsal plate subquadratic, covering most of the segment; 'dorsal tuft rather 

 small with two very long stiff hairs beneath. Ventral brush consisting of about from 

 ten to twelve rays, carrying from four to six rather short hairs; before barred area three 

 or four free tufts; a lateral tuft with one single hair. Anal gills short, equal, acute. 



