To 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXVII. 



species were found in Hscondido River, Nicaragua, 50 miles from 

 Bluetields, by C. W. Richmond; tliey are i)arasitic in the branchial 

 cavity of Bfthynls acanthurus (Wiegmann). 



They differ from the type as above described in having no antero- 

 lateral processes to the head of the female; in 

 having- patches of black on the lateral margins 

 of all the segments of the thorax on one side of 

 the body; and in having sometimes the third 

 and also the fourth lamelhe of the incubator}^ 

 pouch with patches of black. 



In the male the terminal segment has in some 

 specimens a tendency to be bilobed. 



PROBOPYRUS FLORIDENSIS, new species. 



Body of female light brown, with head, abdo- 

 men, ovarian bosses, and epimera light yellow, 

 almost white. Markings of black are present 

 all over thorax and a few black lines are present 

 on the abdomen. The incubatory lamella are 

 almost entirely covered with black markings, so 

 that the color is uniformly dark. The lateral 

 parts of the thorax on the ventral side have markings of black, those 

 of one side being in patches with yellow areas separating them, all 

 the legs of this side being yellow. The legs of the opposite side are 

 dark. 



Fig. 51.— Probopyrus bithy 

 nis, male. x 41. 



Fig. 62. — Probopyrus floridensis. o, dorsal view op female; h, ventral view of same, x 12. 



Head deeply set in thorax, broad anteriorly with frontal margin 

 nearly straight; posterior margin narrowly rounded; eyes wanted. 



The segments of the thorax are distinct. Ovarian bosses are prom- 

 inent on the anterior portion of the sublateral margin of the lirst four 



