28 



CARL BOVALLIUS, THE OXYCEPHALIDS. 



the same length as the second. The extremities of the first four joints 

 are dilated, showing powerful muscles plumosely arranged. In Stebbing- 

 ella the antennal joints are much bent (fig. 30) but in the other genera 

 they are more or less straight. The fifth joint, or in Glossocephalus 

 the fifth and sixth joints are very short (fig. 31). The margins of all 

 the joints are fringed with minute hairs. 



7. The mouth-organs. 



These organs are less developed in the Oxycephalids than in most 

 of , the other Hyperids. In the genus Xiphocephalus (fig. 32) the 

 epistoma forms a rounded, shield-like plate, with a strongly protruding, 



Fig 32. Xiphocephalus Whitei. 



Fig. 33. Oxycephalus 

 piscator. 



Fig. 34. Simorhyncliotus 

 Lilljeborgi. 



central, spine-like process. In the true Oxyce phalidae it consists of a tu- 

 berculous prominence in front of the mouth-organs. 



The lab rum (fig. 33) is more or less distinctly bilobed, the hind 

 margin feebly curved, and almost entirely smooth. 



The mandibles (fig. 34 39) are best developed in the genera 

 Tu 11 berg el la and Glossocephalus, and most simple in the genus 



Fig. 35. Oxycephalus piscator. 



Fig. 36. Oxycephalus 

 piscator. Young c?- 



Xiphocephalus. In the first genus the right mandible has a large, 

 straight, cutting or incisive process with a broad neck springing out from 

 the somewhat elongated stem of the mandible; on the left mandible there 

 is also an accessory process not half as wide as the principal. In 

 Xiphocephalus the mandibles are less elongated than in the Oxyce- 



