ERPETOGOMPHUS. 163 
in details of the brown antehumeral and humeral stripes have induced me, as a matter 
of caution, to keep them separate until definite evidence to the contrary is produced. 
2. Erpetogomphus viperinus. (Tab. VII. figg. 5, 5a, 43.) 
Erpetogomphus viperinus, Selys, Compt.-rend. Soc. Ent. Belg. xi. p. lxviii (1868)*; Bull. Acad. 
Belg. (2) xxviii. p. 176 [13] (1869) ?. 
Herpetogomphus viperinus, Calvert, Proc. Calif. Acad. Sci. (3) i., Zool. p. 385, t. 25. figg. 1, 5 
(vulv. lam. ? , apps. g) (1899) *. 
Costa blackish only in the Zapote female, in all others (¢ 9) yellow anteriorly ; brown humeral stripe 
represented in some by a superior spot only, this independent of locality; abdominal appendages of 
female pale, pale spot on segment 7 often very wide. (Cf.?*.) 
Hab. Mexico, Tepic (Kisen & Vaslit*), Tuxpan in Jalisco (McClendon, coll. P. P. C.: 
2 3), Atoyac in Vera Cruz (Schumann: 3 2), Orizaba (Boucard!2), Puente de Ixtla 
in Morelos (coll. Deam: 1 2), Venta de Zopilote [1 3 |, Tierra Colorada [1 ¢ ] and 
Dos Arroyos [1 ? ] in Guerrero (H. H. Smith); Guaremaua, San Gerdnimo [46,22] 
and Zapote (1 2 | (Champion). 
Taken in the Mexican localities from June to October. The males from Guerrero 
have the apical portion of the inferior appendage less strongly curved upward than in 
those from San Gerénimo, which latter agree with the figure? from Tepic. 
3. Erpetogomphus elaps. (Tab. VII. fig. 44.) 
Erpetogomphus elaps, Selys, Monogr. Gomph. pp. 70, 431, t. 4. figg. 4.a-e (details ¢) (1858)' ; 
Bull. Acad. Belg. (2) vii. p. 588 [12] (1859)*; l.c. (2) xxviii. p. 175 [12] (1869) *. . 
Gomphus elaps, Hagen, Syn. Neur. N. Am. p. 100 (1861) *. 
Herpetogomphus elaps, Calvert, Proc. Calif. Acad. Sci. (3), Zool. i. p. 386, t. 25. fig. 2 (vulv. 
lam. ¢ ) (1899) *. 
Hab. Mexico! (coll. McLachlan: 1 2 with label “ Erpetogomphus elaps, Selys,” in 
Selys’s hand), Tepic (Eisen & Vaslit®), Guadalajara (Schumann: 1 3) [1 3] and 
Tuxpan [1 ¢, 2 2] in Jalisco (McClendon, coll. P. P. C.), Huatusco in Vera Cruz 
(coll. Adams: 1 ¢ ), Orizaba (Boucard*), Cuernavaca (Boucard *) (coils. Deam, W. L. 
Tower: 2 3), Chilpancingo [3 ¢, 2 9], Tepetlapa [1 9], and Rincon [1 ¢, 1 9] 
in Guerrero (H. H. Smith), Atlihuacan (Saussure*+); Guatemata, San Gerénimo 
(Champion: 1 3). 
Taken from June to November in Mexico. From the material before me, the 
inferior appendage of the male should be described as one-half shorter than the 
superiors, rather than one-third!. Brown stripes on the thorax are present in older, 
not in young, imagos. | 
4. Erpetogomphus ophibolus, sp. n. (Tab. VII. figg. 30-32, 46.) 
d. Head chiefly dark brown, the following green: most of the frons, except for transverse narrow stripes in 
front of the antenne and along the inferior margin; a transverse streak or a pair of spots on the labrum 
near its free margin, bases of the mandibles, labium. 
