622 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



short but stout terminal claw bent into a half circle. The distal end 

 of the basal joint and the whole ventral surface of the second joint 

 are covered with a corrugated network of chitin ridges. At the 

 distal end of the corrugation on the second joint a wide triangular 

 spine extends downward on either side from the ventral surface and 

 curves over toward its fellow on the opposite side until their tips 

 almost meet. This is evidently the clasping organ used during the 

 breeding season. The second maxillipeds are also somewhat larger 

 and stouter than in the female. 



The fifth and sixth legs are as plainly differentiated as in Homoiotes 

 palliata (fig. 96). The former are large papillae on the sides of the 

 genital segment extending on the ventral surface well in toward the 

 mid-line. The latter include the entire posterior lobes, and their 

 inner margins extend forward nearly to the center of the genital 

 segment. 



The semen receptacles are of medium size and situated in the 

 bases of the posterior lobes. The ducts leading to them are excep- 

 tionally large, in fact, nearly the diameter of the receptacles them- 

 selves, and much convoluted, and they fill the entire cavity of the 

 genital segment outside the intestine. 



Total length, 3.6 mm.; length of carapace, 2.16 mm.; length of 

 genital segment, 0.75 mm.; length of abdomen, 0.74 mm.; width of 

 carapace, 1.98 mm. 



Color similar to the female, but paler, a light brownish gray to the 

 naked eye, but showing under magnification the spots of blue and 

 purple. 



Chalimus. — Body elongate and spindle-shaped, the entire anterior 

 margin of the carapace prolonged into a wide, triangular rostrum 

 which projects in front of the first antennae a distance equal to two- 

 thirds of the length of the carapace behind the antennae. 



From the apex of this triangle extends the attachment filament, 

 which is wider and stouter than in any chalimus yet examined, and 

 its surface is wrinkled or corrugated transversely. 



The sides of the triangular rostrum are slightly concave and at its 

 base where it joins the carapace proper there is a deep reentrant 

 angle on either side, out of which project the first antennae. In 

 consequence of the elongate rostrum the eyes appear back of the 

 center, three-fifths of the length from the anterior end. But judged 

 with reference to the first antennte they are in about their usual 

 position. 



The posterior margin of the carapace is slightly concave. 



The second and third thorax segments are fused together and con- 

 siderably narrowed. The fourth segment is still narrower, and at its 

 posterior corners may be seen the rudiments of the future dorsal 

 lobes. With these lobes it is a little wider than the last segment, 

 which is a fusion of the genital segment and abdomen. The future 



