NO. 1788. -NORTH AMERICAN ERGASILID^— WILSON. 397 



second antenna. Fig. 151, mouth-parts: la., labrum; md., mandible; mx/ and 

 mx/'^, first and second maxillae; mxp., maxilliped, the single one being drawn 

 in the right position and of the correct size with reference to the other mouth- 

 parts. Figs. 152 to 155, first, second, third, and foiu:th swimming legs. 



Plate 54. 



Female of Bomolochus concinnus, new species. 



Fig. 156, dorsal view. Fig. 157, first antenna. Fig. 158, second antenna. Fig. 159, 

 mouth-parts (see fig. 151) of young female. Fig. 160, maxilliped of adult, show- 

 ing lengthening of the claw. Figs. 161 to 165, first, second, third, fourth, and 

 fifth swimming legs. 



Plate 55. 



Male of Bomolochus concinnus, new species. 



Fig. 166, first antenna of young female, showing diAdsion into 6 segments. Fig. 167, 

 fourth leg of young female. Fig. 168, fifth leg of young female; note resem- 

 blance to fig. 176 and compare with fig. 165. Fig. 169, dorsal view of adult male. 

 Fig. 170, dorsal view of very young male less than half a millimeter in length. 

 Fig. 171, second antenna. Fig. 172, mandible. Fig. 173, first maxilla. Fig. 

 174, maxilliped. Figs. 175 and 176, first and fifth swimming legs. 



Plate 56. 



Female of Bomolochus nitidus, new species. 



Fig. 177, dorsal view. Fig. 178, first antenna. Figs. 179 to 183, first, second, third, 

 fourth, and fifth swimming legs. (Fig. 181 is the fourth pair.) 



Plate 57. 



Male and female of Bomolochus solese Glaus. 



Fig. 184, dorsal view of male. Fig. 185, ventral view of abdomen, showing armature 

 of stiff bristles. Fig. 186, second antenna. Fig. 187, mandible and first maxilla. 

 Fig. 188, second maxilla and paragnath. Fig. 189, fourth swimming leg. Fig. 

 190, side view of female. 



Plate 58. 



Female of Bomolochus exilipes, new species. 



Fig. 191, dorsal view. Fig. 192, ventral view of genital segment and abdomen. Figs. 

 193 and 194, first and second antenna. Figs. 195 to 199, first, second, third, fourth, 

 and fifth s^vimming legs. Fig. 200, rudimentary sixth leg at the opening of the 

 oviduct on the genital segment. Fig. 201, mouth-parts of Bomolochus nitidus 

 (see fig. 151). 



Plate 59. 



Female of Bomolochus teres, new species. 



Fig. 202, dorsal view. Fig. 203, first antenna. Fig. 204, second antenna. Figs. 205 

 to 209, first, second, third, fourth, and fifth swimming legs. Fig. 210, one of the 

 claws on the exopods of the swimming legs. 



Plate 60. 



Female of Txniacanthus alhidus, new species. 



Fig. 211, dorsal view. Fig. 212, ventral view of cephalothorax, showing antennae, 

 mouth-parts, and first swimming legs (compare with text figure 4). Fig. 213, 

 first antenna. Fig. 214, second antenna. Figs. 215 to 218, second, third, fourth, 

 and fifth swimming legs. Fig. 219, first SAvimming leg of male Bomolochus solese. 



