162 NEUROPTERA. 
BBB. Hind margin of occiput distinctly highest in the middle, tibize 
superiorly black. 
G. Brown antehumeral stripe not reaching to the mesinfraepisternum, 
a median tubercle on the upper occipital surface, yellow on middle 
of abdominal segments 3-6 not completely encircling them ; 
abdomen 34'5-38, hind wing 32°5-83'5 mm. . . 2 © © + © + 10. designatus. 
GG. Brown antehumeral stripe reaching to mesinfraepisternum, no 
median tubercle on the upper occipital surface, yellow on middle 
of segments 3-6 forming a narrow transverse band completely 
encircling each segment ; abdomen 33°5, hind wing 28mm. . . . [11]. diadophis.] 
E. menetriesi is omitted from this synopsis as it was described from such an 
imperfect specimen as to prevent its inclusion. The males of sipedon and diadophis 
and the females of eutainia and ophibolus are unknown; the female described as boa 
is, I suspect, crotalinus: all these are likewise missing from the key. In naming the 
new species I have followed the ‘“‘ ophidian” example set by de Selys. 
1. Erpetogomphus eutainia, sp.n. (Tab. VII. figg. 24-27, 39.) 
3. Head and thorax pale green, with the following dark brown: occiput, vertex, antenne; a narrow, 
transverse, superior frontal stripe in front of the antenne, continuous at the sides with a transverse 
stripe running along the inferior margin of the frons; most of the nasus, base and a narrow border on 
the free margin of the labrum; most of the dorsal surface of the middle, and a spot at the base of the 
hind, prothoracic lobe; anterior mesothoracic margin, a right and a left submedian, dorsal, thoracic 
stripe, separated from each other for most part of their length by the pale mid-dorsal carina, but 
narrowly confluent below with the anterior margin (combined width of these two submedians greatest, 
about 1:3 mm., at mid-height, thence narrowing both above and below); an antehumeral and a humeral 
stripe, reaching the antealar sinus above, confluent by a bridge of brown shortly below their upper 
ends, which remain separated, the antehumeral confluent below with the anterior marginal brown 
(pale green area between submedian and antehumeral brown stripes gradually widening from above 
downward); a line on the (obsolete) first and on the second lateral sutures. 
Abdomen largely dark brown, with the following pale green or yellow: all of segment 1; a mid-dorsal stripe, 
auricles and sides inferiorly on 2; a mid-dorsal stripe on 3-5 transversely expanded on the middle of 
each into a band almost encircling the body, continuous on 3 and 4 with a transverse basal ring ; sides 
of 3 inferiorly in basal third ; two transverse bands on 6, one basal, one median ; basal two-thirds of 7. 
The sides of segments 8 and 9 and much of 10 have a reddish-brown tint. 
Superior appendages yellowish, inferior more reddish (for the shapes of these and of the parts of the second 
segment, see the figures and pages 159, 160). 
Wings slightly yellowish especially near the base, costa with a yellow line anteriorly ; pterostigma dark 
reddish-brown between black veins, surmounting 4~54 cells, its costal margin on front wings 3 mm. 
long. Front wings: 14 antenodals, 9-10 postnodals, two post-triangular rows increasing to three at the 
level of the second or third postnodal. Hind wings: 10 antenodals, 10 postnodals, three post-triangular 
cells, then two rows increasing at the level of the last or next to the last antenodal. 
Femora pale green, dark brown anteriorly for their whole length on 1, distal half on 2, distal third on 3; 
tibize and tarsi black. For dimensions, see page 160. 
2 unknown. 
Hab. Mexico, Rio Papagaio in Guerrero (H. H. Smith: 1 ¢ ). 
This male, taken in October, bears a considerable colour-resemblance to the females 
described below as diadophis. The differences in size, in the shape of the occiput, and 
