240 _ NEUROPTERA. 
absence of pruinosity on the body, and hence of age. Thus, the Chiriqui male of angustipennis in the 
McLachlan collection is completely pruinose, but its labium is yellow, unmarked; young individuals of 
vibex from Atoyac have the median labial black spot very distinct. 
Width of the hind wing can be best expressed by giving measurements taken at right angles to the anterior 
margin at the levels of the first antecubital, the anterior end of the arculus, and the nodus, and by the 
ratios between these widths; a selected series follows, based on the left (except in No. 5) hind wing of 
males only :— 
SUES e.228 g*,3 
ELACS jf hws | 8S 
. Ratios. fias |SESs™ | ¢&s., 
. | Width at A: e238 Pe 
i ; —_s-— Ss Pa 3 oO © gi g SBE . 
i: Locality. of ning i. Width Width | 8 g2ES |[sSERL| GS ee Tabium. 
3 , ist ant at Ist at anu ¥ ° 258 Bn ES ny 25 
— st ante- ec. 8 2 DSB aa ors 
z cubital, Arculus., Nodus. (oath atwidth at EEE SS Fie aoe Boe8 
a nodus, | nodus. | 4, Z, 7; 
mm. mm. mm, mm 
1.) Bugaba .......... 30 55 6 75 | °733 | °8 12 R, 13 L 1 2 Entirely yellow. 
2.| Cuba (Gundlach) ..| 33°5| 6:5 7 8:5 | °765 | +823 15 1 2R,3 | do. : 
3. Ruatan I. ........ 32 65 7 8-5 | °765 | °823 16 1 3 R, 2 Lj Median lobe crossed 
and bordered with 
black 
do. wa. eee 32°5| 6:5 7 85 | 765 | *823 }138 RB, 141 1 3 do. 
do. weet eee 33 6°5 7 8-5 | °765 | °823 15 Rk LR 2R do. 
do. ww ee eee 34 6°5 7 9 ‘722 | -777 |15 R, 17 L 1 2 Median lobe black, 
mesial edges of 
lateral lobes nar- 
rowly black. 
do. ws ae reese 33 6°5 7 8-5 | -765 | °823 15-17 1 2 do. 
. do. ww ee eee 34 6:5 7. 85 | -765 | -823 |19 R, 14 L 1 3 R, 21 do. 
.| Guadalajara ...... 34 75 8 95 | °789 | °84 13 1 4 Entirely yellow. . 
Portland, Jamaica..| 30°5| 6°5 7 8 *812 | °875 12 1 3 Median lobe and 
adjacent part of 
lateral lobes cover- 
ed by a quadran- 
| gular black spot. — 
2. Atoyac (in May) ..) 31 6°5 7 8 *812 | +875 14 L 1 3 20 
3. do. wee] 33 75 85 9 833 | *944 10 2 5 R, 4 L} Median lobe and ad- 
Do. joining parts of 
| lateral lobes cover- 
. ed by a subtrian- 
| fos gular black spot. 
| do 35 8 9 95 | -842| -947 |11 RB, 13 L 2 AR, 5L do. 
do 33 rigs) 8 85 | 882} -941 |12 R,13 L 2 4 R,3L do. 
do 33 8 85 9 *888 | -944 |12 R, 11 L 2 , do. 
| do 33 8-5 i) 9:5 | -894 | °947 10 2 3R, 41 do. 
do 34 8°5 ) 95 | -894 | -947 13 2 5 do. 
| do. weee| 84 8°5 9 95 | -&94 | °947 11 2 do. 
. Bugaba .......... 32 8 8°5 9 888 | “944 10 2 3R,4L do. 
21. S.Gerénimo, 3000 ft.) 35 9 95 | 10 9 95 10 2 4 do. 
Nos. 1 and 2 of the above Table are extreme angustipennis, 20 and 21 extreme vibex ; there would appear, 
from these data, to be too gradual a change in the shapes of the bind wings to enable a specific distinction to 
be maintained as previous authors have done. For the same reason I have omitted, even in the preceding 
synopsis, a differential employed by Pref. Karsch* to the effect that insularis has 10-11 marginal cells on 
the hind wings between the short sector and the upper sector of the triangle, while angustipennis has 14-16. 
The results of the difference in width of the base of the hind wing may be seen by comparing our figure 35, 
