238 NEUROPTERA. 
month at the “Bord fangeux du ruisseau Chingo”; these four specimens are recent 
captures (1905) and have preserved their colours well. 
Named in honour of Prof. P. Biolley, well-known for his labours on the fauna and 
flora of Costa Rica. 
3. Orthemis levis, sp.n. (Tab. IX. figg. 38, 39.) 
In addition to the details already given on page 233 :— 
3. Frons superiorly and vertex metallic violet, nasus pale green, rhinarium darker; labrum variable, black, 
with two dots or a transverse basal streak yellow, or yellow with black reduced to a margin along free 
edge. Median black band on labium 1°3 (Guatemala), 1°6 (Teleman and Atoyac) mm, wide. 
Predominant colour of thorax dark brown, mid-dorsal carina brown, on each side of it a pale green or yellow 
line, uniting above with a similarly-coloured transverse line in front of the antealar sinus, this latter at 
its outer end confluent with a narrow pale antehumeral stripe which widens considerably at its lower 
end. A second, more posterior, pale, sinuous antehumeral stripe or line exists immediately anterior to 
the lower half or more of the humeral suture. Some pale green spots on the interalar dorsum. 
Dorsum of abdominal segments 1, 2 and basal half of 3 brown, a mid-dorsal stripe on 1 and 2, and sides of 
1-3 inferiorly, yellowish-green ; dorsum of remainder of 3 and of 4-7 bright red, of 8-10 black, lateral 
margins (and also, in some, the mid-dorsal carina) of 8 red, in some a pale mid-dorsal spot on 10; ventral 
surface of 1-10 dark brown or black, a longitudinal yellow streak on each side of 3-8. 
Superior appendages blackish, longer than 9, not as long as 9+ 10, similar to those of O. ferruginea. Inferior 
appendage rather more slender than that of ferruginea. 
Tips of the wings varying from faintly smoky (Tehuantepec, Atoyac) to brown from the distal end of the 
stigma outward. Membranule, stigma, and venation generally dark brown, but some cross-veins reddish. 
Front wings with 16-18 ante-, 13-15 postcubitals, hind wings with 13-15 ante-, 13-16 postcubitals. 
Extreme base of hind wing, from costa halfway to apex of membranule, deep yellow, which reaches 
outward in the subcostal space halfway to the first antecubital, in the submedian space halfway to the 
cross-vein, in the other spaces not so far; extreme base of front wing similarly, but less extensively, 
coloured. 
In old males the thorax becomes uniformly pruinose, and the markings of the first and second abdominal 
segments are obscured. 
Q. Differs from the ¢ as follows :—Frons superiorly and vertex brown with only a faint metallic tinge, 
more marked in older individuals; labrum chiefly yellow, its free margin black ; median black band of 
the labium narrower (1 mm.); pale transverse line in front of the antealar sinus soon lost, present in 
only one or two of the specimens listed below, the pale submedian and first antehumeral stripes 
consequently not connected ; dorsum of segments 3-7 brownish-red, mid-dorsal carina pale, dilated lateral 
parts of 8 pale yellow; appendages dark brown, subequal to 9. 
Hab. Mexico, Santiago Iscuintla in Jalisco [3 g], Atoyac in Vera Cruz [1 ¢] 
(Schumann) (H. H. Smith: 3 3), Isthmus of Tehuantepec (Sumechrast, M. C. Z.: 
2 3); Guaremaza, Teleman in Vera Paz (Champion: 3 3), San Felipe in Retalhuleu 
(Maxon & Hay, U.S. N.M.: 2 3,4 2), Santa Lucia [3 ¢], San José [11 ¢, 20 ¢ | 
( Williamson, coll. ejusd.) (Hine, O. S. U.: 4 2); Hoypuras [colls. Selys, Martin |.— 
Venezueta, Valencia [coll. Martin, teste Ris in litt. ]. 
Taken in February (Guatemala), May (Atoyac), and July (Santiago Iscuintla). 
Mr. Williamson made this note on this species at Santa Lucia, Feb. 2, 1905 :— 
“ Along a ravine, alighting on twig-tips, not as difficult to take as O. ferruginea, with 
which species it was continually fighting.” Another of his notes is to the effect that 
at San José this species was seen only in the mangrove-swamp. 
The specific name proposed alludes to the slightness of the abdomen. 
