KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 429 



nulated; inferior angle produced to an outwardly directed blunt tooth. Second pair of pereio- 

 poda resembling the first, but having the carpus longer and the inferior angle not so prominent. 

 Third pair having the carpus with the anterior margin subparallel with the posterior; anterior 

 margin oblique, serrated with four large and two small teeth; tooth of inferior angle largest and 

 outwardly directed. Fourth pair of pereiopoda having the meros with the antero-distal angle 

 produced as long as the carpus; carpus long, gradually increasing in diameter, antero-distal 

 margin denticulated and produced towards the inferior angle; tooth of the inferior angle con- 

 siderably the longest, directed straight forward; anterior margin of the united propodos and 

 dactylos rugose.» 



As the description of Phrosina semilunata given by Stebbing in 1888 is very 

 detailed, I shall restrict myself to a few remarks, referring the reader to Stebbing's work. 



The male. 



PL XVIII, fig. 12—20. 



The first pair of antennas, in a not fully adult specimen of the I ong is pina- form, 

 reach to the hind margin of the fifth perseonal segment. They are fixed immediately below 

 the rostral horns; the first joint of the peduncle is thick, as long as broad, and consi- 

 derably longer than the two following joints together. The first joint of the flagellum is 

 not fully twice as long as the whole peduncle, not very tumid, and almost cylindrical. 

 The following joints are short and narrow, being scarcely longer than broad. The flagellar 

 joints are about thirty in number. 



The second pair of antenna? are a little longer than the first. The first free joint 

 of the peduncle is as long as broad, the second is a little longer, the third is still longer. 

 The first flagellar joint is somewhat shorter than the last peduncular, and is slender, about 

 four times as long as broad. The following joints are very short, scarcely longer than 

 broad. The flagellar joints are twenty-six or twenty-eight in number. 



The labriLin is tolerably broad, bilobed. 



The mandibles (PL XVIII, fig. 13) are long and straight. The incisive lamina is sharply 

 crenulated; the secondary lamina of the left mandible is rounded, crenulated, and set with 

 fine hairs. The molar tubercle is broad, armed with five rows of minute, sharp-pointed 

 teeth, and densely set with spine-like bristles. From the middle of the stem arises the 

 mandibular palp, which is unusually short; the first joint is the longest, nearly as long 

 as the two following together, the third joint is shorter than the second. In older males 

 the last two joints of the palp are often lost, and the first or basal joint is bent inwards, 

 so that it easily escapes attention. 



The labium. The lateral lobes are densely covered with fine hairs. 



The first pair of maxilla? (PI. XVIII, fig. 14). The apical portion of the principal 

 lamina is narrowly hollow r ed, the margins fringed with long bristles. The secondary la- 

 mina reaches a little beyond the principal, it is curved, and fringed at the apex with 

 short bristles. 



