272 
Psyche 
[December 
eight to the abdomen. Silvestri differs from this interpretation 
in considering the extra lobe (which by the way may be easily 
distinguished by its smaller size) to belong to the metathorax in 
annandalei nymphs, and to the prothorax in the 14-lobed 
adults, while Morrison assigns it to the mesothorax. The writer 
agreed with Silvestri but a rigorous combined examination by 
Mr. Morrison and himself of material treated in different ways 
has led to the conviction that Morrison’s interpretation is correct. 
The males differ from the females in that none of the ab- 
dominal segments after the seventh are furnished with lobes or 
form part of the marginal lamina. In number of flabella on 
head, thorax and segments 1 to 7 of the abdomen they agree with 
the corresponding female except that there is a tendency towards 
an average of one more flabellum in the abdominal segments. 
The following table shows the number of lobules and their 
flabella on one half of the body in the seven adequately known 
species, in the females only. The thirteen-lobed form of the 
Panama species has been taken as typical and the description 
founded on it alone. Should future work show that the four- 
teen-lobed form is specifically distinct there need then be no 
confusion. — 
• 
mexicana 
suhrafra 
annandalei 
guianoe 
trinidadensis 
insnlaris 
panamensis 
7 
7 
8 
7 
7 
7 
7-8 
Head 
4 
3 
3 
3 ■ 
3 
3 
3 
Prothorax 
9 
12 
10 
9-10 
8 
10-11 
10 
Mesothorax 
/4 
\5 
6-7 
{t 
/4 
\4 
}“ 
5 
Metathorax 
5 
5 
6-7 
4-5 
3-4 
j 
5 
1st abdominal 
7 
7 
7-8 
5-6 
4 
6 
6 
2nd 
7 
7 
8-10 
6 
4 
7-8 
6-7 
3rd “ 
7 
7 
8-10 
6-7 
4 
6-7 
6-7 
4th 
7 
7 
8-10 
6-7 
4 
7 
6-7 
5th 
7 
7 
8-10 
6 
4 
7 
6-7 
6th “ 
7 
7 
8-10 
6 
4 
6 
6 
7th 
4 
4 
5 
4 
4 
4 
4 
8th 
2 
2 
2 * 
3 
3 
3 
3 
