188 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



the anterior margin^ being separated in front by a distance equal to 

 the length of one eye. The basal article of the peduncle of the first 

 pair of antennae is larger and a little longer than the second article; 

 the third article is very slender and about twice as long as the second 



article. The flagelluni is composed of about 

 fourteen articles. The first pair of antenna? 

 extend a little beyond the end of the pe- 

 duncle of the second pair, to the end of 

 the fourth article of the flagellum, or two- 

 thirds the length of the first thoracic seg- 

 ment. The first three articles of the pe- 

 duncle of the second pair of antenna? are 

 subequal; the fourth article is twice as long 

 as the second; the fifth is one and a half 

 times longer than the fourth. The flagel- 

 lum is composed of twenty-five articles. 

 The second antennas extend a little beyond 

 the posterior margin of the third thoracic 

 segment. The frontal lamina is cone- 

 shaped, the base of the cone being large 

 and conspicuous, directed anteriorly and 

 sightly concave. The frontal process of 

 the head slightly overlaps the edge of the 

 base of the cone. 



The first, fourth, fifth, and sixth seg- 

 ments are somewhat longer than any of the 

 others. The post-lateral angles of the first 

 segment are very acute. The epimera of 

 all the segments, from the second to the 

 seventh, inclusive, are distinctly separated 

 off from the segments. The} r are broad 

 plates occupying the entire lateral margins 

 of the segments. In all, the post-lateral 

 angles are acute, but especially so in the 

 epimera of the second, third, and seventh 

 segments. In all the epimera there is a distinct carina, extending from 

 the outer post-lateral angle to about the middle of the side adjacent 

 to the segment in the last four, but to the inner antero-lateral angle 

 in the first two. The epimeron.of the seventh segment is produced 

 posteriorly beyond the posterior margin of the segment. 



All six segments of the abdomen are distinct, although the first is 

 partly covered dorsalh T in the middle by the seventh thoracic segment. 

 The lateral parts of these segments are not separated off from the dorsal 

 portion, but are completely fused. The terminal segment is broadly 

 rounded posteriorly with a small point in the middle. The posterior 



FlG. 173. JEGA. VENTROSA (AFTER 

 SCHICEDTK AND MEINERT). a, 

 FRONTAL MARGIN WITH BOTH 

 ANTENNAE AND FRONTAL LAMINA 

 OF ADULT FEMALE. 6, ADULT FE- 

 MALE, c, FRONTAL MARGIN WITH 



BOTH ANTENNA AND FRONTAL 

 LAMINA OF YOUNG FEMALE, d, 

 YOUNG FEMALE. (ALL ENLARGED. ) 



