ERPETOGOMPHUS. 167 
Hab. Untrep Sratzs, Ohio and Indiana (£. B. Williamson, in litt., Oct. 30, 1903), 
Agee to Offet (coll. Adams: 1 3 ) in Tennessee 9, Marion County, Arkansas’, Kansas °, 
Pecos River !23 (Pope, M. 0. Z.: 2 3), Dallas®, Waco 4, Round Mt. (Schaupp, colls. 
P.P.C., A. N.S, Amer. Ent. Soc.: 15 3,3 9 ), and San Antonio® (A. Agassiz, 
M. C. Z.: 12; Schaupp, Am. Ent. Soc.: 1 3), all in Texas (colls. McLachlan, 
A. N.8., Am. Ent. Soc.: 2 3, 2 2 ).—Mzxico, Monclova (Palmer, M. C. Z.: 1 2). 
The Tennessee male quoted has the convex angulation of the upperside of the 
superior appendages rather more pronounced and tooth-like than any of the others, 
but perhaps this is an individual peculiarity. 
[11. Erpetogomphus diadophis, sp. n. (Tab. VII. figg. 35, 47.) 
3 unknown. 
2. Head and thorax yellowish-green, the following brown: a transverse line on the frons superiorly in front 
of the antenne, on the fronto-nasal suture, in the depressions of the nasus and on the basal articulation 
of the labrum (all these lines paler brown than the following) ; vertex, occiput, much of the rear of the 
head; dorsum of the middle prothoracic lobe, except a pair of small median spots, an indistinct streak 
along the anterior mesothoracic margin ; a pair of submedian dorsal thoracic stripes, separated from each 
other only by the pale mid-dorsal carina, not reaching the anterior margin below but reaching the ante- 
alar sinus above, widest at mid-height ; an antehumeral stripe reaching the mesinfraepisternum below 
but not the antealar sinus above, a narrower complete humeral stripe, a line on the (obsolete) first and 
on the second lateral sutures. Pale area between the dark submedian and antehumeral stripes widening 
from above downward, subequal in width at mid-height to the latter ; pale area between dark ante- 
humeral and humeral subequal in width to the latter. 
Abdomen dark brown or blackish, the following parts pale green or yellow: most of segment 1, a mid-dorsal 
stripe for the whole length of 2, and the first three-quarters of 3 and 4, confluent on 3 and 4 with a 
transverse median band which encircles the body ; a similar transverse band on 5-7, interrupted on 7 by 
a mid-dorsal brown line; sides of 2 inferiorly, a basal lateral spot on 3-7. Segments 8-10 obscure 
brownish, paler on the sides. Appendages longer than 10, shorter than 9, obscure brownish, acute 
at tip. 
Vulvar lamina (see figure) followed on segment 9 by a semicircular groove whose convexity is directed 
backward. 
Femora pale green or yellow, anteriorly blackish for their entire length, although hardly more than a line on 
the proximal half of the third ; tibiz and tarsi black. 
Wings very pale yellowish at base, especially near the anterior margin, costa with a yellow line anteriorly, 
pterostigma dark brown within black veins, surmounting 43-63 cells, costal edge on front wings 3-5 mm. 
long. Front wings: 13-14 antenodals, 9-10 postnodals, two post-triangular rows increasing at the leyel 
of the second postnodal or beyond. Hind wings: 10 antenodals, 9-11 postnodals, three post-triangular 
cells, then two rows increasing at the level of the last or next to the last antenodal. 
Dimensions.—(See page 162.) 
Hab. Unirep States, Texas (coll. McLachlan: 2 2). 
The resemblance and the differences between these females and the male described 
as E. eutainia have been alluded toon page 162. For a time I had thought it possible 
that these females might be £. menetriesi, but the differences in the shape of the 
occiput and perhaps in the colouring of the abdomen seem to preclude this, They 
are similar to designatus, but the differences are pointed out on page 162. ] 
