248 BULLETIN OF THE 



Bohm's genus Gnamptorhynchus. The presence of dactyli in the first pair 

 of legs and the differences in the antennae appear, however, to warrant the 

 separation. 



Scaeorh3mchus armatus, ep. nov. 



Plates II. and V. 



Body slender, segments constricted in the middle. Lateral processes longer 

 than the -width of the body, widely separated. The two anterior pairs are 

 directed somewhat forwards, the two posterior somewhat backwards. Each 

 has a very prominent conical vertical spine near its outer end. In the median 

 line of each of the three hinder segments of the body is a similar, though some- 

 what shorter spine. 



Oculiferous segment as long as the rest of the body to the base of the abdo- 

 men, narrow, with nearly parallel sides. A little behind the middle is the very 

 prominent, acute, conical oculiferous tubercle. OceUi rudimentary, without 

 pigment. 



Abdomen slender, clavate, two thirds as long as the oculiferous segment. 



The rostrum (Fig. 4) has been partially described above. At its point of 

 attachment its diameter is not more than one fifth that of the widest part. 

 Mouth large, triangular, with three powerful chitinous jaws and three fleshy 

 lips corresponding in position with the jaws. 



"Antennae " a little more than one third the rostrum, directed straight for- 

 wards, separated by a considerable interval ; the oculiferous segment is not at 

 all emarginate between them. There are two equal cylindrical joints followed 

 in the female (Fig. 27) by a very small swollen rudimentary chela, and in the 

 male (Fig. 26) by a still small but well developed chela with long, slender, 

 curved unarmed claws. 



Palpi (Fig. 28) nearly or quite twice the rostrum, slender, tapering, and sim- 

 ple. The two basal joints are very short, as in Colossendeis ; 3d, about seven 

 times as long as the two basal joints taken together; 4th, about one fifth the 3d; 

 5th, seven eighths the 3d ; 6th, short, quadrate ; 7th, one third the 3d ; 8th, 

 one half the 3d ; 9th, a little less than the 8th ; 10th, straight and slender, less 

 than the 9th. Outer joint sparsely hairy ; hairs simple, short, more numer- 

 ous along the lower side. The palpi usually have a sigmoid flexure bend- 

 ing sharply backwards at the fourth joint and forwards again at the sixth. 



The accessory legs (Fig. 30) are rather larger in the male, but do not other- 

 ■wise differ markedly in the two sexes. There are three very short basal joints ; 

 4th, more than twice as long as the three basal joints taken together, curved, 

 with a slight scarcely conical elevation on its anterior side which is very con- 

 stant and characteristic ; 5th, slightly clavate, shorter than 4th ; 6th, 7th, 8th, 

 9th, 10th, diminish pretty regularly in length; 6th, strongly clavate, with a 

 brush of slender hairs at its lower distal angle which are much longer and more 

 numerous in the male. Spines of 7th to 10th joints (Fig. 31) arranged, as in Co- 

 lossendeis, in several irregular rows. They are lanceolate, acute, coarsely serrate, 



