GQG MK. E. J. MIERS ON THE 



Subfamily 3. Mithracin^. (See Plate XIII. figs. 7, 8-) 

 {Mithraeincs, Stimpson.) 



Carapace broadly triangular, sometimes transverse, with the sides 

 slightly arcuate ; interorbital space narrow. Rostrum short or obsolete. 

 Second joint of antennae not dilated. Anterior legs with the fingers exca- 

 vated at the tips. 



In this subfamily are iBcluded those Periceridee wliicli most nearly 

 approach the Cancroids of the suljfamily Chlorodiinge in the form of 

 the carapace, the obsolescence of the rostral spines, the small and 

 completely defined orbits (which do not project laterally as in the 

 Pericerinse), the extremely short epistoma, and the form and de- 

 velopment of tlie anterior and ambulatory legs. llitJiraculus, 

 which stands at the end of the series, is indeed hardly to be di- 

 stinguished in external form from the Cancroid Phymodius or 

 CMorodius, from which, however, it is in reality separated by the 

 position and great development of the basal antennal joint. Ne- 

 mausa, on the other hand, marks the transition to the Maiidse. 



Nemaitsa, Alplionse Milne-Edwards. Carapace longer than 

 broad ; spines of rostrum well developed. Basal joint of antennse 

 with a long spine at its distal end. Anterior legs in male not 

 much enlarged ; palm slender. Ambulatory legs not compressed. 

 Type Nemausa sj^inipes (Bell). 



This genus presents affinities with MieropTirys, and also with 

 Herlstia and Scliizophrys among the Maiidae. 



PAHATHoii, Jfiers. Carapace triangular, rounded behind. 

 Pront very small and narrow, truncated or notched. Basal an- 

 tennal joint narrow as in Scyra, longer than broad, and without 

 any spine at its distal end. Anterior legs with the palm dilated, 

 and fingers arcuate, meeting at the tips. Ambulatory legs not 

 dilated, and compressed. Type ParatJioe rofundata, Miers. 



Its habitats (the Grulf of Snez and Piji Islands) are of great in- 

 terest, as the subfamily is almost exclusively American. The ex- 

 amples before me have nearly the aspect of Tkoe ; hence the generic 

 name. 



(The genus Paramaya of De Haan was founded upon a species 

 which he subsequently referred (rightly I believe) to Maia. The 

 name may, however, have to be retained for the Faramaya Dehaani 

 of White, referred to in his ' List of Crustacea in the British 

 Museum,' p. 7 (1847). This species is founded upon a single 

 female specimen, bleached and probably immature, Avhich closely 

 resembles Mithracc, but difi"ers from the species of that genus in 



