364 SUPPLEMENT. 
female intermediate between those of frequentula and of pulla. Fig. 2, Tab. X., is 
more characteristic than fig. 41, Tab. VIII., owing to the imperfect condition of the 
appendages of the Izamal male. The examples from Puerto Cortez are larger than the 
others. 
8. Argia pulla (p. 79; emend.). (Tab. IV. figg. 88, 33 ss; Tab. X. figg. 6-8.) 
Argia pulla, Hagen, Bull. Mus. Comp. Zool. xxxix. t. 1. figg. 16, 16a (apps. gd) (1902) 
References *~ as on p. 79, anted; * is doubtful. 
Argia puella, Baker, Invert. Pacif. i. p. 86 (1905) ’. 
The capture by Mr. Williamson of several pairs of what appeared at first sight to be this species has shown 
that two closely related forms or species exist, and has made it possible to correlate the two sexes of 
these. Thanks to the unfailing kindness of Mr. Henshaw, I have been able to compare Hagen’s two 
types of pulla with the other material and so to ascertain definitely what the true pulla is. As a result, 
the list of localities previously given for pulla (anted, page 79) requires some revision, but the description 
there given applies to both of the species differentiated below. 
. Superior appendages ¢ (cf. figures 
cited for each species) 
. Inferior appendages ¢ : most in- 
ferior of the three apical lobes as 
seen 1n profile view 
External apical angle as seen in 
ventral view (= middle lobe of 
profile view) | 
. Mesostigmal lamina 9 (cf. the 
figures cited for each species) 
. Fork of the mid-dorsal thoracic 
carina at its lower (anterior) 
end 92 
. Mesepimeral part of the forked 
black humeral stripe ? 
A. pulla, 
more deeply divided at apex. 
more distinct from the other two. 
not acute, rounded almost as much 
as the inner apical angle. 
less elongated transversely, not 
attaining the mid-dorsal thoracic 
line by one-half its own long 
dimension, the interval between 
right and left laminz as great 
as the long dimension of one of 
them. 
about as wide as deep, within the 
fork is a small geminate yellow 
spot. 
reaching upward less than half-way 
toward the wing-base, or absent. 
4 
° 
A. frequentula. 
less deeply divided at apex. 
less distinct from the other two. 
almost acute, distinctly more 
pointed than the inner apical 
angle, which is rounded. 
more elongated transversely, reach- 
ing mesad nearly to the mid- 
dorsal line, so that the interval 
betweeen right and left lamine 
is not more than one-third of the 
long dimension of one ot them. 
narrower than deep, no geminate 
yellow spot within the fork. 
reaching upward to more than 
half-way toward the wing-base 
(or absent in some ?). 
6. Postcubitals: front wings d.... 12-16 (14) 13-16 (14) 
” 99 Qaeee 18-16 (14) 13-16 (14, 15) 
hind wings ¢.... 10-14 (12) 12-15 (12) 
9 » Qe 11-14 (12) 12-14 (13) 
7, Abdomen, in mm. ¢.......... 25-26°5 27-28 
” ” ore 24-5—28 25-28 
8. Hind wing, inmm. d ........ 17-19 18°5-19°5 
er » g 17-20 18-5-20 
The differences between these two species are more marked in the females than in the males. The males of 
both species have character 4 asin pulla Q, character5 asin frequentula 9. The numbers of postcubitals 
