Vol. xxiii] ENTOMOLOGICAL NEWS 201 
irregular stripe across the mesepimeron; from this stage this stripe 
grows in width posteriorly till it occupies nearly the entire area (pat- 
tern II, as described under moesta) ; this stage represents the maximum 
development of black on the thorax and is attained by only a single 
specimen. 
Abdomen black above, pale below on the sides on all segments but 
7, pale narrow blue basal rings on 3-7, a longitudinal middorsal stripe, 
absent or very reduced on 6-7; 9 and Io variable, generally gray or light 
brown, excepting the lower lateral margins and ventrally, and a black 
lateral spot on either side, near the middle, of 9; this spot on 9 may be 
wanting or it may be developed into an elongated spot. 
Abdominal appendages similar to moesta (see Fig. 29, Tab. 4, 
Biol. Centr. Am. Neur.), but the inferiors are longer than the superiors 
(not equal), and are terminated by a large, rounded, pale tubercle. 
Female. Similar to the male. Black area on rear of head reduced 
to a spot on either side. 
Darkest thoracic pattern: A black line on either side of the mid- 
dorsal thoracic carina, originating just below the antealar sinus and 
reaching the mesostigmal lamina, separated from the black middorsal 
carina by pale area equal to the width of the black line, the dark line 
and the pale area next the carina together occupy less than one-half 
the area of the mesepisternum. This black area is developed in a pale 
area which is present on the mesepisternum as well as on the mese- 
pimeron and metepimeron, as described for moesta. In other speci- 
mens the black dorsal lines on either side of the middorsal carina 
are reduced and in three specimens they are wanting altogether. No 
such lines are present in moesta. All specimens show more or less 
distinctly the pale areas above mentioned as present on females of 
moesta, 
Abdomen darker than in any moesta examined, though, if the red- 
dish brown of moesta be considered dark, moesta has a more extensive 
area dark colored, since in moesta there is no longitudinal middorsal 
pale area, while in intruda the dorsum is black (instead of reddish 
brown as in moesta), and there is a narrow but sharply defined and 
distinct pale longitudinal middorsal stripe, narrowest on 7, where it is 
reduced to the merest line. The lateral black is carried posteriorly 
on to 9, usually to its apex; 10 is pale colored. Sides of abdomen below 
the black, pale colored. 
The mesostigmal lamina of intruda differs from moesta as follows: 
in moesta the posterior (or superior) lobe of the lamina is symmetrical 
with the border of the lamina on either side similarly curved, while 
the anterior (or inferior) border of the lamina is distinctly concave, 
the external angle of the lamina being correspondingly acute; in 
intruda the posterior (or superior) border of the lamina external to 
