70 



geneous, the blackish brown stripe being less conspicuous and often almost obsolete. 

 The scales on the lateral parts of the thorax are more greyish than those of 0. punctor. 



The abdominal bands are pure white, not creamy, forming straight lines 

 without any contraction in the middle line even on the apical segments. Underside 

 of abdomen usually all white. Femora darker than in O. punctor. Tibiae and tarsi 

 with more numerous pale scales. 



Size 6 mm. 



Male. Palpi entirely black; mesonotum covered with an almost homogeneous 

 greyish-brown tomentum. Abdomen and legs as in female. Genitalia: Side pieces 

 more than twice as long as wide; outer edge straight; apical lobe rather well 

 developed with only a few long hairs at tip; basal lobe well developed with long 

 hairs; clasp-filaments slender, slightly expanded in the middle, bearing a long arti- 

 culated terminal spine. Stem of harpagones very long, columnar; terminal filament 

 hardly more than half as long as stem, slender and bearing two ridges. Size 6'5 mm. 



Larva: Head rounded; wider than long, a notch at insertion of antenna?; 

 front margin arcuate. Antennae short, antennal tuft small, with only a few hairs; 

 on apex three hairs and a short digit. Anteantennal tuft multiple; lower and upper 

 frontal tuft both consisting of one hair, or lower of two, upper of one hair. Eyes 

 large. Thorax subquadratic angled at hair-tufts; hair formula of frontal border 

 3131441313. In tuft 4 two hairs shorter than the others. Lateral hairs in multiple 

 tufts and some single strong hairs. Abdominal segments rather broad, the first of 

 them much shorter than the last. Lateral hairs on the first segment four, on the 

 second three, on the third to seventh two. On fourth to seventh segments subdorsal 

 hairs in double or. triple tufts. Tufts of eighth segment in common arrangement; 

 lateral comb consisting of about forty to fifty scales, arranged in rows occupying 

 a large triangular area; scales blunt with many almost equally long apical teeth. 

 Sipho short, straight, tapering at apex only a little more than double as long as 

 wide rarely three times longer than wide. At basal third a pecten consisting of 

 about twenty thorns all in line, and most of them with from 1 to 4 teeth of un- 

 equal length at base; a tuft of hairs between end of pecten and apex. 



Anal segment longer than wide; the dorsal plate subquadratic, covering the 

 two thirds of the segment; dorsal tuft large, two very long stiff hairs beneath. 

 Ventral brush consisting of about 17 rays, every ray carrying from five to seven 

 hairs. Before the barred area about six free hair-tufts; a lateral tuft with two hairs. 

 Anal gills rather long, acute, equal. Lateral tufts of labrum short, but dense; the 

 inner part with a crown of comb-hairs; palatum large, covered with long, soft 

 hairs. Mandibles quadrangular with two strong spines before the collar; a row of 

 short cilia from a collar. About twelve thorn-like bristles from margin. Dentition: four 

 or five strong teeth, before them two short, acute thorns; long cilia below thorns. 

 Process below distinctly furcate with strong hair-tufts on both tips; a group of 

 hairs at base. Maxillae very broad, obtuse at front, at apex a brush of long hairs, 

 a seta near the apex, beneath the brush; near the inner margin a coating of 



