52 



black scales especially distally and dorsally; no dark scales proximally and ven- 

 trally (as in O. cantons); tibiae and metatarsi yellow with some more intermixed 

 black scales; tarsi almost black at apex with three or four white basal bands, 

 progressively narrower in the lower joints; the last joint commonly quite black. 

 Claw formula I'l I'l I'l. Length 78 mm. 



Male. I have only had badly conserved specimens of this species in the male 

 sex and have been unable to distinguish them from males of 0. excrusians. According 

 to Mr. EDWARDS the males of O. annulipes may be distinguished from 0. cantons 

 by the structure of the genitalia. In 0. annulipes the harpes are long and strap- 

 shaped, in 0. cantans however they are shorter and provided with a large, mem- 

 braneous expansion near the tip; in this particular my few badly conserved speci- 

 mens agree with Dr. EDWARDS' indications, but, as far as I can see, they are rather 

 difficult to distinguish from those of O. excrusians. 



Larva: Head broad, rounded, wider than long, restricted before eyes, and 

 slightly notched before the antenna?; front margin slightly arcuate, almost straight; 

 Antennae short, strongly attenuated at apex, spined, serration none or a very indistinct 

 one along inner border; tuft almost in the middle consisting of from four to six 

 hairs; at apex two long spines, one shorter and a digit; yellow between base and 

 tuft, dark between tuft and apex. Eyes large, transverse, pointed. Anteantennal tuft 

 multiple, lower frontal tuft with four, upper with two thick hairs. Thorax rounded, 

 wider than long, angled at hair-tufts; -hair formula of frontal border most probably 

 3111441113; in tuft four, three of the hairs short, and hair 1 after tuft four, short. 

 Lateral hairs in tufts; besides some single strong hairs. 



Abdomen moderate; anterior segment short, posterior ones narrower and elon- 

 gate: hairs rather long, lateral hairs of the first segment triple, on the second to 

 seventh double; subdorsal hairs double on fourth to sixth segments. Eighth seg- 

 ment with tufts in common arrangement. Lateral comb consisting of about forty- 

 five scales, occupying a triangular space; the single scale spatulated at base, ending 

 in a very strong and long spine and furnished w r ith a series of long, remarkably 

 strong lateral spines; sipho long, slender, about three and a half times longer than 

 broad, remarkably straight, not so much tapering at apex as the siphones of 0. 

 excrusians and 0. lutescens; pecten reaching less than halfway, all spines at the same 

 distance, all wide at base and with from four to six large basal thorns without 

 any smaller one at base; in contradistinction to the larva of 0. lutescens also the 

 two last spines have basal teeth; a large tuft at middle of tube beyond pecten. 

 Anal segment almost twice as long as wide; the dorsal plate almost covering the 

 sides; dorsal hair-tuft consisting of a coarse tuft, and two strong and long hairs; 

 ventral brush large in the barred area, consisting of about from twelve to fourteen 

 rays, each ray carrying about six or seven hairs; before barred area six free 

 hair-tufts; the lateral hair-tuft consisting of one single strong hair; four gills equal, acute. 



Lateral tufts of labrum short; the inner part modified in comb hairs, arranged 

 as a crown round the palatum, this is covered with short soft hairs. Mandibles 



