106 NEUROPTERA. 
The “race” or “variety,” which agrees structurally with A. allopterum, differs in 
having all or the greater part of the abdomen yellowish-red, while in A. allopterum, 
type, the abdomen is blackish. I suspect that this difference may really be due to age, 
but the proof is lacking. 
2. Anisagrion truncatipenne, sp. n. (Tab. V. fig. 17.) 
g. Pale brown, with the following exceptions: lips, gene, and a very faintly indicated antehumeral stripe 
pale green or blue; large postocular spots of the same colour not bounded with any dark colour 
posteriorly ; two transversé stripes on the top of the head from eye to eye, one in front of the base of the 
antennez, the other across the ocelli, intersegmental abdominal articulations, apical eighth of segments 4 
and 5, apical half (?) of 6, an external (or superior) stripe on the tibie, and much of the tarsi, dark 
brown or black ; a pale basal ring on segments 4-6 (7-10 lost). . 
Pterostigma on the front wings brown, costal and posterior sides subequal and longer than the other two, 
which form oblique angles with the costa; that on the hind wings similar, but the proximal and distal 
sides are at right angles with the costa. From the pterostigma outward the hind wing is truncated on its 
costal margin so as to be quite obtuse. The small cells at the extreme tip between the costa and the 
median vein are filled up solidly so as to resemble a so-called “‘ false” pterostigma. Between the median 
vein and the principal sector, from the vein descending from the inner end of the pterostigma (brace vein) 
is a long cell, almost pointed at its distal end, four times longer than the pterostigma surmounting it. On 
the front wings the cell below the pterostigma is but slightly longer than it. 
Dimensions.— Abdominal segments 1-6, 20; hind wing 16 mm. 
Hab. Guatema.a, El Reposo, Pacific coast-region (Champion: 1 3). 
This individual is not fully mature ; its appendages being lost, I would not think of 
describing it were it not for the peculiar structure of its hind wings. Some other 
details are given in the preceding key. 
3. Anisagrion lais. (Tab. V. figg. 15, 19.) 
Nehalennia lais (Brauer, MS.), Selys, Bull. Acad. Belg. (2) xlii. p. 990 (1876) *. 
$. The youngest individuals are pale reddish- or yellowish-brown throughout, with darker brown at the inter- 
segmental abdominal articulations, at the apices of 5 and 6, and on the greater part of the dorsum of 7 
and 8, where it has a bronzy reflection. As age increases, the darker brown becomes more intense and 
spreads over the entire dorsal surface of the abdomen backward and forward from 7 and 8, except for a 
narrow, transverse, basal, medially interrupted, yellow ring on 3-7. The darkening of the thorax does 
not seem to bear a fixed ratio to the darkening of the abdomen, but when the fifth segment is dark brown 
dorsally there is a dark brown stripe on each side of the mid-dorsal thoracic carina (which remains yellow 
in the oldest individuals I have seen), and a dark brown inferior posthumeral stripe ; subsequently each 
paramedian stripe broadens, the posthumeral extends upward to the base of the wings (where it later 
fuses with the upper end of the paramedian), and a black stripe appears on the upper half of each 
metepisternum ; a pale, narrow, greenish-yellow, humeral stripe persists even in the oldest individuals I 
have seen. On the head the first dark colour to appear is a transverse blackish stripe from eye to eye 
across the ocelli; later this is united with black, which covers the vertex -as far forward as the base of 
the antenne (but leaving a pale green spot on the eye-margin behind each antenna). The pale post- 
ocular spots, which remain distinct in the oldest individuals, connected or unconnected with each other, 
- are early delimited posteriorly with blackish, and the nasus becomes black. The oldest individuals have 
segments 8 and 9 markedly pruinose, although this may appear on individuals having the thorax and first 
three abdominal segments still prodominantly pale in colour. 
2. Passes through colour-changes similar to those described for the male; the pruinosity on the older 
individuals is more generally distributed. 
Dimensions.—Abdomen, 3 26-33°5, 9 26°5-30°5; hind wing, g 175-22, 9 18°5-21:5 mm. 
