80 



angular spots. Venter with a more or less well-defined dark median line not all 

 white as in 0. communis. Femora yellowish white, without dark scales scattered 

 over the light parts ; tibiae and tarsi dark, with scarcely any light scales ; in 0. corn- 

 munis tarsi have several numerous pale scales. Length 5.5 6.5 mm. 



I have never seen the male; according to indications kindly sent me by Mr. 

 EDWARDS the male genitalia of 0. punctor differ very much from those of 0. corn- 

 munis. The side pieces have only a rather faintly developed apical lobe, with many 

 short hairs; clasp-filaments with some hairs (three) along the outer edge; a large 

 densely haired basal lobe; blade of harpags not much shorter than the stem. See 

 also LANG (1920 Fig. 64). 



Larva. Head rounded, wider than long; a notch at insertion of antennse; front 

 margin strongly arcuate. Antenna? short, only slightly tapering at front; antennal 

 tuft nearer to the base of the antennse; consisting only of a few hairs. At apex, three 

 short hairs and one or two digits; colour yellowish-brown, not brighter at base. 

 Antennal tuft multiple, upper and lower frontal tuft both consisting of two strong 

 hairs. Eyes large, triangular. Thorax subquadratic angled at hair-tufts. Hair formula 

 of frontal border 3121441213; tuft one after tuft four only consisting of one or two 

 very small hairs, the other hairs of frontal border all being strong. Lateral hairs 

 in multiple tufts and some single strong hairs. Abdominal segments rather broad, 

 the first of them shorter than the others; lateral hairs on the first two segments 

 three, on the third to seventh two. On fourth to seventh segments two series of 

 single, subdorsal hairs. Tufts of eighth segment in common arrangement; comb 

 consisting of about twenty-five scales, occupying a triangular area-; the scales are 

 very long, acute with a strong very acute median tooth and a few shorter ones. 

 Sipho short, straight, tapering at apex, three times longer than broad, often a 

 little more. A pecten consisting of about twenty thorns, all in line and most 

 of them with from three to four teeth at base. A tuft of hair between end of pecten 

 and basis. 



Anal segment almost as long as broad, ringed by a plate ; dorsal tuft rather feeble, 

 with two very strong, long hairs beneath. Ventral brush consisting of about from 

 twelve to fourteen rays, every ray carrying from six to seven hairs. Before the 

 barred area about five free hairtufts, a lateral tuft with one hair. Anal gills moderate, 

 acute, equal. 



Lateral tufts of labrum short, dense, the. inner part with a crown of comb- 

 hairs; palatum covered with short, stiff hairs. Mandibles quadrangular, with two 

 strong spines before the collar, a row of short cilia before collar. About fourteen 

 thorn-like bristles from margin; the last strong. Dentition: four strong teeth, before 

 them one acute thorn, serrated; long cilia below the thorns. Process below distinctly 

 furcate with strong hair-tufts on both tips, a, group of hairs at base. Maxillae broad, 

 obtuse, at apex a brush of long hairs and a seta near the apex below the brush; 

 the whole inner part of the maxillae covered with a coarse coating of long soft 



