ACANTHAGRION.—TELEBASIS. 115 
ACANTHAGRION. 
Acanthagrion, Selys, Bull. Acad. Belg. (2) xli. p. 304 (1876) ; Kirby, Cat. Odon. p. 144 
(1890). 
This genus is confined to Central and South America. 
1. Acanthagrion gracile. (Tab. V. fig. 20.) 
Agrion gracile, Rambur, Ins. Névr. p. 260 (1842) *. 
Acanthagrion gracile, Selys, Bull. Acad. Belg. (2) xli. p. 807 (1876) *; Martin, Boll. Mus. Zool. 
Torino, xi. no. 239, p. 3 (1896) *; no. 240, p. 2 (1896) ‘. 
Vars. cuneatum, quadratum, Selys, loc. cit. p. 809 (1876) °. 
Races ? minarum, lancea, vidua, Selys, loc. cit. pp. 809, 310 (1876) °. 
3. Blue on segment 7 occupying apical fourth to eighth (Atoyac), apical tenth to a very narrow apical 
ring (Teapa, Texolo). One of the specimens from Teapa having least blue on segment 7 has the postocular 
spots smaller, and in these two respects only resembles the description of race? minarum, Three of 
the Brazilian males have segment 7 entirely black dorsally, but are otherwise like typical A. gracile. 
In var. quadratum the black on the dorsum of segment 1 is in the form of a square basal spot not 
touching the apex; in typical A. gracile the dorsal black reaches from base to apex of 1; the material 
from Atoyac comprises quadratum, typical A. gracile, and intermediates in that: the basal black spot is 
furnished with a “tail” of varying width which reaches to the apex. 
Hab. Mexico, Texolo (Rhoads: 3 6, 2 2), Atoyac [8 ¢], Teapa [5 ¢] (H. H. 
Smith), Putla®?; Guatemata, San Gerénimo, Vera Paz (Champion: 1 ¢ ).—ConomBta 
(Dr. Festa*); Braztu? (coll. P. P.C., ex coll. R. Martin: 43,12), Para?, Pernambuco 
(Veilenmann, M. C. Z.: 1 3, 12), Campobello?, Juiz de Fora?, Nova Freiburgo 
(Beshke, coll. P. P. C., ex coll. Hagen: 1 3), Entre Rios?, Rio Janeiro, Tijuca 2, 
Porto Novo?, Sao Sebastido (A. Hempel, coll. A. N. 8.: 1 3,1 9); Paraguay 
(Borelli >). 
The Mexican specimens were collected between January and May. 
The Brazilian examples have usually one more postcubital on both front (11) and 
hind (9) wings respectively than those of Mexico. The “varieties” cuneatum 
and guadratum were both described ® from “ Mexico” and the former also from Rio 
Janeiro; they are hardly worthy of distinct names. Cuneatum has the black on 1 
and 2 cuneiform, point anterior, and broadly touching the apex of both segments ; 
Ihave not seen it. The other three “races” are not known outside of South 
America. | 
TELEBASIS. 
Telebasis, Selys, Bull. Acad. Belg. (2) xx. pp. 376,378 (1865)'; Compt. Rend. Soc. Ent. Belg. xi. 
p. xxi (1869) *; Kirby, Cat. Odon. p. 155 (1890) *. 
Erythragrion, Selys, Bull. Acad. Belg. (2) xlii. p. 955 (1876)*. 
The species included by de Selys* in this genus inhabit the West Indies, and 
eastern South America to Southern Brazil, as well as Mexico and Central America. 
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