26 



CARL BOVALLIUS, THE OXYCEPHALIDS. 



which is very stout, while the third is distinct; the first joint of the fla- 

 gellum is not curved, but in a straight line with the peduncle, and much 

 longer than it, though not thicker. In the family Oxycephalidge, 

 the first flagellar joint is followed by a second and third, the last longer 



Fig. 24. Xiphocephalus Fig. 25. Simorliynchotus 

 Whitei Lilljeborgi. >. 



Fig. 26. Glossoccphulus spiniger 



and more slender than the second. In the family Xiphocephalidae 

 the flagellum consists of only one joint, much longer than the peduncle, 

 bulbous or tumid at the lower end, and carrying some long olfactory hairs. 



6. The second pair of antennae. 



They consist in the male of five joints in all the genera except 

 Glossocephalus, where they are composed of six. The first four 



joints are elongated, articulating with 

 each others in such a way as to allow 

 of being folded up like a carpenter's 

 rule. The last or the last two joints 

 in Glossocephalus are minute, and 

 the articulation allows of but little move- 

 ment. The first joint of the second 

 pair of antennas varies in length, ac- 

 cording to the length of the head, 

 being shorter than half the second 

 joint in the genera Simorhynchotus, 

 Tullbergella and Cranocephalus 

 (fig. 27 and 28). With this shortness 

 of the first joint is connected a very 

 important difference in the manner of 

 hiding the antennae when folded. In the three just mentioned genera 

 the folded antennae are concealed for more than half their length under 



Fig. 27. Tullbergella cuspidata 



