358 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



First antenna 6-segmented, sparsely setose. Second antenna 

 has terminal hook with a swollen base. Mouth tube slightly wider 

 than long. Maxilliped slender, with a double terminal hook. 



Legs close together; not visible in dorsal view; arising from 

 narrow ventral laminae. First leg with one spine on basipod and 

 two spines on terminal segment ; endopod with four apical spines ; 

 endopod with one spine on proximal segment and three on distal 

 segment. Second leg with one spine on proximal segment of exo- 

 pod and three on distal segment ; endopod with one spine on basal 

 segment and four on distal segment. 



Measurements: Whole body 0.6 mm.; head 0.15 mm.; thorax 

 and abdomen 0.58 mm. ; width of whole body 0.9 mm. ; head 0.3 

 mm. ; thorax 0.4 mm. 



Male. — Unknown. 



^7/296.— U.S.N.M. No. 88518. 



Hosts. — Six females were taken from the gills of the black angel- 

 fish, Pomacanthus arcuatus (Linnaeus) and three from the French 

 angelfish, P. paru (Bloch). 



Remarks. — This species resembles Wilson's (1913) H. uncata 

 and H. insolita, but it differs in the shape of the head, the length 

 of the caudal rami, the greater number of eggs in the egg-strings, 

 the double hook at the distal end of the maxilliped, and the shape 

 of the body. 



HATSCHEKIA PARVA, new species 



Figure 74, h^k 



Female. — Head a little wider than remainder of body (0.17-0.14 

 mm.) and about one-fourth as long, truncate and with median 

 notch in front, tapered a little and rounded behind. First and sec- 

 ond legs in plain view, as they protrude laterally. Eggs large, 4-6 

 in a string. 



First antenna 3-segmented and somev/hat setose. Second an- 

 tenna long, constricted at the proximal third of its basal joint; 

 terminal hook sharply bent at its distal third and sharp. Mouth 

 tube far back on head behind bases of maxillipeds, rectangular 

 with rounded corners, slightly longer than wide. First maxilla 

 small, with one short seta. Maxillipeds with wide second segment, 

 a narrow segment distal to that, and a short slightly bifid terminal 

 hook. 



Both pairs of legs are biramous. First leg with exopod 2-seg- 

 mented and armed with two plumose setae ; endopod 2-segmented, 

 with two setae on the tip of the distal segment. Second leg with 

 both rami 2-segmented; each segment of the exopod has one ter- 



