666 



MR. E. J. MIEllS ON THE 



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

 {Mithracincp, Stimpson.) 



Carapace broadly triangular, sometimes transverse, with the sides 

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

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

 vated at the tips. 



In this subfamily are included those Periceridje wliicli most nearly 

 approach the Cancroids of the subfamily Chlorodiinje 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. MitliraculuSj 

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

 stinguished in external form from tlie Cancroid JPhymodius or 

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

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

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



Nemausa, Aljplionse Milne-Edwards. Cariipace longer than 

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

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

 much enlarged ; palm slender. Ambulatory legs not compressed. 

 Type Nemausa s])ini])es (Bell). 



This genus presents affinities with Ilicrophrys, and also with 

 Ilerhstia and Scliizoplirys among tlie Maiidse. 



Pakatiioe, liters . Carapace triangular, rounded behind. 

 Front 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 Avith the palm dilated, 

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

 dilated, and compressed. Type Paratlioe rotundciia^ Miers. 



Its habitats (the Gulf of Suez and Fiji Islands) are of great in- 

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

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

 name. 



(The genus Paramaya of De Haan w^as founded upon a species 

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

 name may, however, have to be retained for the Paramaya Deliaani 

 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, which closely 

 resembles Mitlirax, but differs from the species of that genus in 



