No. 26.] 



ARTHROSTRACA OF CONNECTICUT. 



FIG. 17. Calliopius l&viusculus. 



First antennae shorter than second and with first joint of 

 peduncle considerably thicker and a little longer than second; 

 third joint with a conspicuous triangular process projecting below 

 flagellum and bearing about eight calceoli on lower margin ; flagel- 

 lum longer than peduncle, with joints produced at antero-inferior 

 angle and each provided with a pair of calceoli and several 

 olfactory setx on lower side. Second antennae with last two 

 joints of peduncle subequal in length, the fourth joint extending 

 as far as the second joint of first antennae; flagellum subequal 

 to peduncle, joints not produced below, furnished with calceoli. 



