GOMPHOIDES.—ERPETOGOMPHUS. 159 
placed it doubtfully as a race of suasa, which seems more probable, as only slight 
colour-differences separate it from suasa. 
7. Gomphoides bifasciata. 
Gomphoides bifasciata, Hagen, Bull. Acad. Belg. (2) xlvi. p. 663 [71] (1878) (?)?. 
Gomphoides appendiculatus, Kirby, Aun. & Mag. Nat. Hist. (7) iii. p. 368, t. 15. figg. 3 (entire 
insect), 3a, 36 (apps. ¢) (1899) (¢)?. 
Hab. Mexico, Isthmus of Tehuantepec (Ff. Sumichrast, M. C. Z.: 1 @ type of 
Hagen, with label in his handwriting, “ G. bifasciata, Hagen, an suasa?” 1); Panama 
(Dolby-Tyler 2), 
Mr. Kirby himself suggested ? the possible identity of appendiculata with bifasciata ; 
and on comparing his description with the type of the latter, I think it probable, as 
the differences, including those of size, are parallelled in the two sexes of ambiqua. 
Judging from his figs. 3a, 36, the “lowest appendage” of the description? of 
appendiculatus is a piece of dried excrement projecting from the anal opening. 
ERPETOGOMPHUS. 
Erpetogomphus, Selys, Monogr. Gomph. p. 69 (1858)*; Bull. Acad. Belg. (2) vii. p. 535 [9] 
(1859)?; Hagen, Syn. Neur. N. Am. p. 98 (1861) °. 
Herpetogomphus, Hagen, Proc. Bost. Soc. Nat. Hist. xvii. p. 42 (1875)*; Selys, Compt.-rend. 
Soc. Ent. Belg. 1879, p. Ixiii*; Kirby, Cat. Odon. p. 60 (1890) °; Needham, Canad. Ent. 
xxix. pp. 166, 168 (1897), xxxi. p. 234 (1899)°; Calvert, Proc. Calif. Acad. Sci. (3), 
Zool, i. p. 386 (1899) ’. 
A very characteristic genus of the present fauna. Eleven species are now known, 
ten of which have actually been found in Mexico or Central America. The eleventh, 
E. compositus, is known from Texas and Arizona, and will doubtless be found in 
Mexico; it has been reported from the Yellowstone and Oregon, which, with Ohio 
and Indiana (E. designatus), are the most northern known limits of Hrpetogomphus. 
To the south, Guatemala is at present the known limit; there is, however, a very 
doubtful record from Brazil. 
Reasons have been given elsewhere® for rejecting de Selys’s last arrangement ® of 
the species. | 
Synopsis of the Species. 
Males. 
A. Basal half of lower edge of superior appendages not (or very slightly) 
enlarged in profile; if present, this enlargement forms at most an 
inferior tubercle in the basal sixth or seventh. 
B. Superior appendages with no prominent superior tooth; hind margin 
of the occiput almost straight, or slightly concave at middle. 
